diff --git a/sources/src/test/java/pr2/auffrischung/grossmacher/GrossmacherTest.java b/sources/src/test/java/pr2/auffrischung/grossmacher/GrossmacherTest.java
new file mode 100644
index 0000000..cd6d979
--- /dev/null
+++ b/sources/src/test/java/pr2/auffrischung/grossmacher/GrossmacherTest.java
@@ -0,0 +1,44 @@
+package pr2.auffrischung.grossmacher;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class GrossmacherTest {
+
+    private static PrintStream out;
+
+    @BeforeAll
+    static void setup() {
+        out = System.out;
+    }
+
+    @AfterAll
+    static void tearDown() {
+        System.setOut(out);
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = { "alles klein", "ALLES GROSS", "gemIschT" })
+    void testMain(String text) throws IOException {
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        PrintStream ps = new PrintStream(bos);
+        System.setOut(ps);
+
+        Grossmacher.main(new String[] { text });
+        String result = String.format("Ergebnis: %s\nZeichen : %d",
+                text.toUpperCase(),
+                text.length());
+
+        assertEquals(result, bos.toString().trim());
+        bos.close();
+        // Don't close ps!
+    }
+}
diff --git a/sources/src/test/java/pr2/auffrischung/labeled_break/ArraySucherTest.java b/sources/src/test/java/pr2/auffrischung/labeled_break/ArraySucherTest.java
new file mode 100644
index 0000000..1aafdc0
--- /dev/null
+++ b/sources/src/test/java/pr2/auffrischung/labeled_break/ArraySucherTest.java
@@ -0,0 +1,28 @@
+package pr2.auffrischung.labeled_break;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+
+public class ArraySucherTest {
+
+    final int[][] EMPTY = {{}};
+    final int[][] ZERO = { { 0, 0, 0 }, { 0, 0, 0 }};
+    final int[][] END = { { 0, 0, 0 }, { 0, 0, 1 }};
+    final int[][] BEGINNING = { { 1, 0, 0 }, { 0, 0, 0 }};
+    final int[][] ONE = { { 1, 1, 1 }, { 1, 1, 1 }};
+    final int[][] TRIANGLE = { { 0, 0 }, { 0, 0 }, { 0, 0, 0 }, { 0, 0, 0, 1 } };
+
+
+    @Test
+    void testSuche() {
+        var as = new ArraySucher();
+        assertFalse(as.suche(EMPTY));
+        assertFalse(as.suche(ZERO));
+        assertTrue(as.suche(END));
+        assertTrue(as.suche(BEGINNING));
+        assertTrue(as.suche(ONE));
+        assertTrue(as.suche(TRIANGLE));
+    }
+}
diff --git a/sources/src/test/java/pr2/auffrischung/password/PasswortCheckerTest.java b/sources/src/test/java/pr2/auffrischung/password/PasswortCheckerTest.java
new file mode 100644
index 0000000..8ff2758
--- /dev/null
+++ b/sources/src/test/java/pr2/auffrischung/password/PasswortCheckerTest.java
@@ -0,0 +1,19 @@
+package pr2.auffrischung.password;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static pr2.auffrischung.password.PasswortChecker.checkPassword;
+
+public class PasswortCheckerTest {
+
+    @Test
+    void testPasswordChecker() {
+        assertEquals(0, checkPassword("mutti"));
+        assertEquals(0, checkPassword("1234"));
+        assertEquals(1, checkPassword("Mutti"));
+        assertEquals(2, checkPassword("mutti123"));
+        assertEquals(3, checkPassword("Mutti123"));
+        assertEquals(4, checkPassword("Mutti123!%"));
+    }
+}
diff --git a/sources/src/test/java/pr2/auffrischung/printf/DoubleFormatterTest.java b/sources/src/test/java/pr2/auffrischung/printf/DoubleFormatterTest.java
new file mode 100644
index 0000000..1318b53
--- /dev/null
+++ b/sources/src/test/java/pr2/auffrischung/printf/DoubleFormatterTest.java
@@ -0,0 +1,60 @@
+package pr2.auffrischung.printf;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static pr2.auffrischung.printf.DoubleFormatter.printDouble;
+
+public class DoubleFormatterTest {
+
+    private static PrintStream out;
+
+    @BeforeAll
+    static void setup() {
+        out = System.out;
+    }
+
+    @AfterAll
+    static void tearDown() {
+        System.setOut(out);
+    }
+
+    @Test
+    void testPrintf() throws IOException {
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        PrintStream out = System.out;
+        PrintStream ps = new PrintStream(bos);
+        System.setOut(ps);
+
+        printDouble(1.0);
+        assertEquals("1.000", bos.toString().trim());
+        bos.reset();
+        printDouble(10.1);
+        assertEquals("10.100", bos.toString().trim());
+        bos.reset();
+        printDouble(2.01);
+        assertEquals("2.010", bos.toString().trim());
+        bos.reset();
+        printDouble(2.001);
+        assertEquals("2.001", bos.toString().trim());
+        bos.reset();
+        printDouble(2.0001);
+        assertEquals("2.000", bos.toString().trim());
+        bos.reset();
+        printDouble(2.0004);
+        assertEquals("2.000", bos.toString().trim());
+        bos.reset();
+        printDouble(2.0005);
+        assertEquals("2.001", bos.toString().trim());
+        bos.reset();
+
+        bos.close();
+        // Don't close ps!
+    }
+}
diff --git a/sources/src/test/java/pr2/auffrischung/suchemax/GroessteZahlTest.java b/sources/src/test/java/pr2/auffrischung/suchemax/GroessteZahlTest.java
new file mode 100644
index 0000000..2710577
--- /dev/null
+++ b/sources/src/test/java/pr2/auffrischung/suchemax/GroessteZahlTest.java
@@ -0,0 +1,27 @@
+package pr2.auffrischung.suchemax;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class GroessteZahlTest {
+
+    @Test
+    void testSucheMax() {
+        GroessteZahl g = new GroessteZahl();
+        assertEquals(8, g.sucheMax(
+                new int[] {1, 5, 8, 2, 0}));
+        assertEquals(-1, g.sucheMax(
+                new int[] {-1, -5, -8, -2, -20}));
+        assertEquals(10000, g.sucheMax(
+                new int[] {10000, -10000, 1, 2, 33}));
+        assertEquals(9, g.sucheMax(
+                new int[] {9}));
+        assertEquals(0, g.sucheMax(
+                new int[] {0, 0, 0, 0, 0, 0, 0}));
+        assertEquals(Integer.MAX_VALUE, g.sucheMax(
+                new int[] {Integer.MIN_VALUE, Integer.MAX_VALUE}));
+        assertEquals(Integer.MIN_VALUE, g.sucheMax(
+                new int[] {Integer.MIN_VALUE, Integer.MIN_VALUE}));
+    }
+}
diff --git a/sources/src/test/java/pr2/auffrischung/taschenrechner/TaschenrechnerTest.java b/sources/src/test/java/pr2/auffrischung/taschenrechner/TaschenrechnerTest.java
new file mode 100644
index 0000000..ec98243
--- /dev/null
+++ b/sources/src/test/java/pr2/auffrischung/taschenrechner/TaschenrechnerTest.java
@@ -0,0 +1,35 @@
+package pr2.auffrischung.taschenrechner;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+
+public class TaschenrechnerTest {
+
+    @Test
+    void testRechne() {
+        Taschenrechner t = new Taschenrechner();
+        assertEquals(0.0, t.rechne(0.0, '+', 0.0));
+        assertEquals(0.0, t.rechne(0.0, '-', 0.0));
+        assertEquals(0.0, t.rechne(0.0, '*', 0.0));
+        assertEquals(0.0, t.rechne(0.0, '/', 1.0));
+        assertEquals(0.0, t.rechne(0.0, '^', 1.0));
+
+        assertEquals(2.0, t.rechne(1.0, '+', 1.0));
+        assertEquals(0.0, t.rechne(1.0, '-', 1.0));
+        assertEquals(1.0, t.rechne(1.0, '*', 1.0));
+        assertEquals(1.0, t.rechne(1.0, '/', 1.0));
+        assertEquals(1.0, t.rechne(1.0, '^', 1.0));
+
+        assertEquals(4.4, t.rechne(2.2, '+', 2.2));
+        assertEquals(2.2, t.rechne(4.4, '-', 2.2));
+        assertEquals(4.4, t.rechne(2.2, '*', 2.0));
+        assertEquals(2.0, t.rechne(2.2, '/', 1.1));
+        assertEquals(4.0, t.rechne(2.0, '^', 2.0));
+
+        assertEquals(Double.NaN, t.rechne(1.0, '~', 1.0));
+
+        assertNotEquals(0.0, t.rechne(1.0, '~', 1.0) );
+    }
+}
diff --git a/sources/src/test/java/pr2/collections/iterator/test/SimpleStackTest.java b/sources/src/test/java/pr2/collections/iterator/test/SimpleStackTest.java
new file mode 100644
index 0000000..7abca23
--- /dev/null
+++ b/sources/src/test/java/pr2/collections/iterator/test/SimpleStackTest.java
@@ -0,0 +1,87 @@
+package pr2.collections.iterator.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.collections.iterator.SimpleStack;
+
+import java.util.Iterator;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * Test für den Stack.
+ */
+public class SimpleStackTest {
+
+    /**
+     * Testet den Stack an sich.
+     */
+    @Test
+    void testStack() {
+        SimpleStack<String> s = new SimpleStack<>(10);
+        s.push("A");
+        s.push("B");
+        s.push("C");
+        s.push("D");
+        assertEquals("D", s.peek());
+        assertEquals("D", s.pop());
+        assertEquals("C", s.pop());
+        assertEquals("B", s.pop());
+        s.push("A2");
+        s.push("A3");
+        assertEquals("A3", s.peek());
+        assertEquals("A3", s.pop());
+        assertEquals("A2", s.pop());
+        assertEquals("A", s.pop());
+    }
+
+// TODO: Einkommentieren
+//
+//    /**
+//     * Testet den Iterator.
+//     */
+//    @Test
+//    void testIterator() {
+//        SimpleStack<String> s = new SimpleStack<>(10);
+//        s.push("A");
+//        s.push("B");
+//        s.push("C");
+//        s.push("D");
+//
+//        String[] result = new String[5];
+//        int count = 0;
+//
+//        for (String string : s) {
+//            result[count++] = string;
+//        }
+//
+//        assertEquals("D", s.peek());
+//
+//        assertEquals("D", result[0]);
+//        assertEquals("C", result[1]);
+//        assertEquals("B", result[2]);
+//        assertEquals("A", result[3]);
+//
+//        s.push("E");
+//
+//        Iterator<String> it = s.iterator();
+//
+//        count = 0;
+//        while (it.hasNext()) {
+//            result[count++] = it.next();
+//        }
+//
+//        assertEquals("E", result[0]);
+//        assertEquals("D", result[1]);
+//        assertEquals("C", result[2]);
+//        assertEquals("B", result[3]);
+//        assertEquals("A", result[4]);
+//
+//        assertFalse(it.hasNext());
+//
+//        it = s.iterator();
+//
+//        assertTrue(it.hasNext());
+//    }
+}
diff --git a/sources/src/test/java/pr2/collections/reverser/test/ReverserTest.java b/sources/src/test/java/pr2/collections/reverser/test/ReverserTest.java
new file mode 100644
index 0000000..efc0c5e
--- /dev/null
+++ b/sources/src/test/java/pr2/collections/reverser/test/ReverserTest.java
@@ -0,0 +1,18 @@
+package pr2.collections.reverser.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.collections.reverser.Reverser;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class ReverserTest {
+
+    @Test
+    void testReverser() {
+        // TODO: Reverser testen
+    }
+
+}
diff --git a/sources/src/test/java/pr2/collections/reverser_generic/test/ReverserTest.java b/sources/src/test/java/pr2/collections/reverser_generic/test/ReverserTest.java
new file mode 100644
index 0000000..94f7da4
--- /dev/null
+++ b/sources/src/test/java/pr2/collections/reverser_generic/test/ReverserTest.java
@@ -0,0 +1,18 @@
+package pr2.collections.reverser_generic.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.collections.reverser_generic.Reverser;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class ReverserTest {
+
+    @Test
+    void testReverser() {
+        // TODO: Reverser testen
+    }
+
+}
diff --git a/sources/src/test/java/pr2/collections/sortieren/test/SorterTest.java b/sources/src/test/java/pr2/collections/sortieren/test/SorterTest.java
new file mode 100644
index 0000000..a2c30f2
--- /dev/null
+++ b/sources/src/test/java/pr2/collections/sortieren/test/SorterTest.java
@@ -0,0 +1,75 @@
+package pr2.collections.sortieren.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.collections.sortieren.Sorter;
+import pr2.collections.sortieren.Sorter.SortOrder;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+
+
+/**
+ * Test für die Sortierung.
+ */
+public class SorterTest {
+
+    private static final String[] DATA =
+            {"aaron", "ALFONS", "bond", "BerND", "henry", "Hugo"};
+
+    /**
+     * Testet die Sortierung: aufsteigend.
+     */
+    @Test
+    void testAscendingSorting() {
+
+        String[] asc = DATA.clone();
+
+        Sorter.sort(asc, SortOrder.ASCENDING);
+
+        assertArrayEquals(
+                new String[] {"ALFONS", "BerND", "Hugo", "aaron", "bond",
+                        "henry"}, asc);
+    }
+
+    /**
+     * Testet die Sortierung: Absteigend.
+     */
+    @Test
+    void testDescendingSorting() {
+
+        String[] desc = DATA.clone();
+        Sorter.sort(desc, SortOrder.DESCENDING);
+
+        assertArrayEquals(
+                new String[] {"henry", "bond", "aaron", "Hugo", "BerND",
+                        "ALFONS"}, desc);
+    }
+
+    /**
+     * Testet die Sortierung: Aufsteigend, CI.
+     */
+    @Test
+    void testAscendingCISorting() {
+
+        String[] ascCI = DATA.clone();
+        Sorter.sort(ascCI, SortOrder.ASCENDING_CASE_INSENSITIVE);
+
+        assertArrayEquals(
+                new String[] {"aaron", "ALFONS", "BerND", "bond", "henry",
+                        "Hugo"}, ascCI);
+    }
+
+    /**
+     * Testet die Sortierung: Absteigend, CI.
+     */
+    @Test
+    void testDescendingCISorting() {
+
+        String[] descCI = DATA.clone();
+
+        Sorter.sort(descCI, SortOrder.DESCENDING_CASE_INSENSITIVE);
+
+        assertArrayEquals(
+                new String[] {"Hugo", "henry", "bond", "BerND", "ALFONS",
+                        "aaron"}, descCI);
+    }
+}
diff --git a/sources/src/test/java/pr2/enums/eigene/test/WuerfelTest.java b/sources/src/test/java/pr2/enums/eigene/test/WuerfelTest.java
new file mode 100644
index 0000000..af7a80c
--- /dev/null
+++ b/sources/src/test/java/pr2/enums/eigene/test/WuerfelTest.java
@@ -0,0 +1,60 @@
+package pr2.enums.eigene.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.enums.eigene.Wuerfel;
+
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * Test für die Würfel.
+ */
+public class WuerfelTest {
+
+    /**
+     * Anzahl der Durchläufe (Gesetz der großen Zahl!).
+     */
+    private static final int RUNS = 10000000;
+
+
+    @Test
+    void testFairnessD4() {
+        internalTestFairness(new Wuerfel(Wuerfel.D4), 2.5);
+    }
+
+    @Test
+    void testFairnessD6() {
+        internalTestFairness(new Wuerfel(Wuerfel.D6), 3.5);
+    }
+
+    @Test
+    void testFairnessD8() {
+        internalTestFairness(new Wuerfel(Wuerfel.D8), 4.5);
+    }
+
+    @Test
+    void testFairnessD10() {
+        internalTestFairness(new Wuerfel(Wuerfel.D10), 5.5);
+    }
+
+    @Test
+    void testFairnessD12() {
+        internalTestFairness(new Wuerfel(Wuerfel.D12), 6.5);
+    }
+
+    /**
+     * Interne Hilfsmethode, um die Fairness zu testen.
+     *
+     * @param w        der zu testende Wuerfel.
+     * @param expected Erwartungswert.
+     */
+    private void internalTestFairness(Wuerfel w, double expected) {
+        long sum = 0;
+
+        for (int i = 0; i < RUNS; i++) {
+            sum += w.roll();
+        }
+        double average = (double) sum / (double) RUNS;
+        assertEquals(expected, average, 0.1);
+    }
+}
diff --git a/sources/src/test/java/pr2/exceptions/ausnahmen_testen/test/CaesarTest.java b/sources/src/test/java/pr2/exceptions/ausnahmen_testen/test/CaesarTest.java
new file mode 100644
index 0000000..a821a0b
--- /dev/null
+++ b/sources/src/test/java/pr2/exceptions/ausnahmen_testen/test/CaesarTest.java
@@ -0,0 +1,36 @@
+package pr2.exceptions.ausnahmen_testen.test;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import pr2.exceptions.ausnahmen_testen.CrypterCaesar;
+import pr2.exceptions.ausnahmen_testen.IllegalKeyException;
+import pr2.exceptions.ausnahmen_testen.IllegalMessageException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+
+/**
+ * Testklasse für die Verschlüsselung.
+ */
+public class CaesarTest {
+
+    // TODO: Tests für die Ausnahmen hinzufügen
+
+    /**
+     * Testet die Verschlüsselung an sich.
+     *
+     * @throws IllegalMessageException Wird geworfen, wenn die
+     *                                 Nachricht ungültig ist.
+     * @throws IllegalKeyException     Wird geworfen, wenn der Schlüssel
+     *                                 ungültig ist.
+     */
+    @Test
+    void testCaesar()
+            throws IllegalKeyException, IllegalMessageException {
+        String klarText = "KATHARGOMUSSFALLEN";
+        CrypterCaesar c = new CrypterCaesar();
+        assertEquals(klarText, c.decrypt("C", c.encrypt("C", klarText)));
+        assertEquals("FDHVDU", c.encrypt("C", "CAESAR"));
+        assertEquals(klarText, c.encrypt("Z", klarText));
+    }
+}
diff --git a/sources/src/test/java/pr2/exceptions/eigene_ausnahme/test/FuseTest.java b/sources/src/test/java/pr2/exceptions/eigene_ausnahme/test/FuseTest.java
new file mode 100644
index 0000000..66dd5e0
--- /dev/null
+++ b/sources/src/test/java/pr2/exceptions/eigene_ausnahme/test/FuseTest.java
@@ -0,0 +1,159 @@
+package pr2.exceptions.eigene_ausnahme.test;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import pr2.exceptions.eigene_ausnahme.Fuse;
+import pr2.exceptions.eigene_ausnahme.FuseTrippedException;
+import pr2.exceptions.eigene_ausnahme.IllegalCurrentException;
+
+/**
+ * Testet die Sicherung.
+ */
+public class FuseTest {
+
+// TODO: Quellcode wieder einkommentieren
+//
+//    /**
+//     * Testet die Erzeugung von Sicherungen mit gültigen Werten.
+//     *
+//     * @throws IllegalCurrentException ungültiger Wert für die Sicherung.
+//     */
+//    @Test
+//    void testCreationValid() throws IllegalCurrentException {
+//        new Fuse(Fuse.A16);
+//        new Fuse(Fuse.A25);
+//        new Fuse(Fuse.A32);
+//    }
+//
+//    /**
+//     * Testet die Erzeugung von Sicherungen mit ungültigen Werten.
+//     *
+//     * @throws IllegalCurrentException ungültiger Wert für die Sicherung.
+//     */
+//    @Test
+//    void testCreationValid1() throws IllegalCurrentException {
+//        Assertions.assertThrows(IllegalCurrentException.class, () -> {
+//            new Fuse(15);
+//        });
+//    }
+//
+//    /**
+//     * Testet die Erzeugung von Sicherungen mit ungültigen Werten.
+//     *
+//     * @throws IllegalCurrentException ungültiger Wert für die Sicherung.
+//     */
+//    @Test
+//    void testCreationValid2() throws IllegalCurrentException {
+//        Assertions.assertThrows(IllegalCurrentException.class, () -> {
+//            new Fuse(-1);
+//        });
+//    }
+//
+//    /**
+//     * Testet die Erzeugung von Sicherungen mit ungültigen Werten.
+//     *
+//     * @throws IllegalCurrentException ungültiger Wert für die Sicherung.
+//     */
+//    @Test
+//    void testCreationValid3() throws IllegalCurrentException {
+//        Assertions.assertThrows(IllegalCurrentException.class, () -> {
+//            new Fuse(0);
+//        });
+//    }
+//
+//    /**
+//     * Testet die Erzeugung von Sicherungen mit ungültigen Werten.
+//     *
+//     * @throws IllegalCurrentException ungültiger Wert für die Sicherung.
+//     */
+//    @Test
+//    void testCreationValid4() throws IllegalCurrentException {
+//        Assertions.assertThrows(IllegalCurrentException.class, () -> {
+//            new Fuse(Integer.MAX_VALUE);
+//        });
+//    }
+//
+//    /**
+//     * Testet die Erzeugung von Sicherungen mit ungültigen Werten.
+//     *
+//     * @throws IllegalCurrentException ungültiger Wert für die Sicherung.
+//     */
+//    @Test
+//    void testCreationValid5() throws IllegalCurrentException {
+//        Assertions.assertThrows(IllegalCurrentException.class, () -> {
+//            new Fuse(Integer.MIN_VALUE);
+//        });
+//    }
+//
+//    /**
+//     * Testet das Auslösen der Sicherung.
+//     *
+//     * @throws FuseTrippedException    Sicherung hat ausgelöst.
+//     * @throws IllegalCurrentException ungültiger Wert für die Sicherung.
+//     */
+//    @Test
+//    void testTripping1()
+//            throws FuseTrippedException, IllegalCurrentException {
+//
+//        Fuse f = new Fuse(Fuse.A16);
+//        f.use(5);
+//        f.use(16);
+//        f.use(0);
+//
+//        f = new Fuse(Fuse.A25);
+//        f.use(5);
+//        f.use(16);
+//        f.use(25);
+//
+//
+//        Assertions.assertThrows(FuseTrippedException.class, () -> {
+//            Fuse f2 = new Fuse(Fuse.A16);
+//            f2.use(0);
+//            f2.use(16);
+//            f2.use(25);
+//        });
+//    }
+//
+//    /**
+//     * Testet das Auslösen der Sicherung.
+//     *
+//     * @throws FuseTrippedException    Sicherung hat ausgelöst.
+//     * @throws IllegalCurrentException ungültiger Wert für die Sicherung.
+//     */
+//    @Test
+//    void testTripping2()
+//            throws FuseTrippedException, IllegalCurrentException {
+//        Assertions.assertThrows(FuseTrippedException.class, () -> {
+//            new Fuse(Fuse.A16).use(17);
+//        });
+//    }
+//
+//    /**
+//     * Testet das Auslösen der Sicherung.
+//     *
+//     * @throws FuseTrippedException    Sicherung hat ausgelöst.
+//     * @throws IllegalCurrentException ungültiger Wert für die Sicherung.
+//     */
+//    @Test
+//    void testTripping3()
+//            throws FuseTrippedException, IllegalCurrentException {
+//
+//        Assertions.assertThrows(FuseTrippedException.class, () -> {
+//            new Fuse(Fuse.A16).use(Integer.MAX_VALUE);
+//        });
+//    }
+//
+//    /**
+//     * Testet das Auslösen der Sicherung.
+//     *
+//     * @throws FuseTrippedException    Sicherung hat ausgelöst.
+//     * @throws IllegalCurrentException ungültiger Wert für die Sicherung.
+//     */
+//    @Test
+//    void testTripping4()
+//            throws FuseTrippedException, IllegalCurrentException {
+//        Assertions.assertThrows(FuseTrippedException.class, () -> {
+//            new Fuse(Fuse.A32).use(40);
+//        });
+//    }
+}
diff --git a/sources/src/test/java/pr2/exceptions/fakultaet/test/FakultaetTest.java b/sources/src/test/java/pr2/exceptions/fakultaet/test/FakultaetTest.java
new file mode 100644
index 0000000..3f1b5a9
--- /dev/null
+++ b/sources/src/test/java/pr2/exceptions/fakultaet/test/FakultaetTest.java
@@ -0,0 +1,32 @@
+package pr2.exceptions.fakultaet.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.exceptions.fakultaet.Fakultaet;
+import pr2.exceptions.fakultaet.FakultaetException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+
+public class FakultaetTest {
+
+    @Test
+    void testFact() {
+        Fakultaet f = new Fakultaet();
+        assertEquals(1, f.fact(0));
+        assertEquals(1, f.fact(1));
+        assertEquals(2, f.fact(2));
+        assertEquals(6, f.fact(3));
+        assertEquals(24, f.fact(4));
+        assertEquals(3628800, f.fact(10));
+    }
+
+    @Test
+    void testFactEx1() {
+        // TODO: Auf Ausnahme testen
+    }
+
+    @Test
+    void testFactEx2() {
+        // TODO: Auf Ausnahme testen
+    }
+}
diff --git a/sources/src/test/java/pr2/generics/einfach/test/ListeTest.java b/sources/src/test/java/pr2/generics/einfach/test/ListeTest.java
new file mode 100644
index 0000000..e680148
--- /dev/null
+++ b/sources/src/test/java/pr2/generics/einfach/test/ListeTest.java
@@ -0,0 +1,61 @@
+package pr2.generics.einfach.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.generics.einfach.Liste;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+/**
+ * Test für die Liste.
+ */
+public class ListeTest {
+
+    /**
+     * Testet das Hinzufügen und Löschen der Liste.
+     */
+    @Test
+    void testAddAndClear() {
+        Liste l = new Liste();
+
+        assertEquals(0, l.size());
+
+        l.add("Hallo");
+        assertEquals(1, l.size());
+        l.add("Hugo");
+        assertEquals(2, l.size());
+        l.add("Peter");
+        l.add("Alfons");
+        assertEquals(4, l.size());
+
+        l.clear();
+        assertEquals(0, l.size());
+    }
+
+    /**
+     * Testet das Lesen von Elementen.
+     */
+    @Test
+    void testGet() {
+        Liste l = new Liste();
+        l.add("Hallo");
+        l.add("Hugo");
+        l.add("Peter");
+        l.add("Alfons");
+
+        assertNull(l.get(-1));
+        assertNull(l.get(4));
+        assertEquals("Hallo", l.get(0));
+        assertEquals("Hugo", l.get(1));
+        assertEquals("Peter", l.get(2));
+        assertEquals("Alfons", l.get(3));
+
+        assertEquals(4, l.size());
+        l.clear();
+        assertEquals(0, l.size());
+        assertNull(l.get(0));
+        assertNull(l.get(1));
+        assertNull(l.get(2));
+        assertNull(l.get(3));
+    }
+}
diff --git a/sources/src/test/java/pr2/generics/super_extends/test/ListeTest.java b/sources/src/test/java/pr2/generics/super_extends/test/ListeTest.java
new file mode 100644
index 0000000..91c7cb8
--- /dev/null
+++ b/sources/src/test/java/pr2/generics/super_extends/test/ListeTest.java
@@ -0,0 +1,43 @@
+package pr2.generics.super_extends.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.generics.super_extends.Liste;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+
+/**
+ * Test für die Liste.
+ */
+public class ListeTest {
+
+    /**
+     * Testet das Umkopieren.
+     */
+    @Test
+    void testAddAndClear() {
+// TODO: Einkommentieren
+//        Liste<String> ls = new Liste<>();
+//        Liste<Object> lo = new Liste<>();
+//
+//        ls.add("Hallo");
+//        ls.add("Hugo");
+//        ls.add("Peter");
+//        ls.add("Alfons");
+//
+//        ls.copyInto(lo);
+//
+//        assertEquals("Hallo", lo.get(0));
+//        assertEquals("Hugo", lo.get(1));
+//        assertEquals("Peter", lo.get(2));
+//        assertEquals("Alfons", lo.get(3));
+//
+//        lo = new Liste<>();
+//        lo.fillFrom(ls);
+//
+//        assertEquals("Hallo", lo.get(0));
+//        assertEquals("Hugo", lo.get(1));
+//        assertEquals("Peter", lo.get(2));
+//        assertEquals("Alfons", lo.get(3));
+    }
+}
diff --git a/sources/src/test/java/pr2/interfaces/comparable_student/ComparableStudentTest.java b/sources/src/test/java/pr2/interfaces/comparable_student/ComparableStudentTest.java
new file mode 100644
index 0000000..68e2608
--- /dev/null
+++ b/sources/src/test/java/pr2/interfaces/comparable_student/ComparableStudentTest.java
@@ -0,0 +1,25 @@
+package pr2.interfaces.comparable_student;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+
+public class ComparableStudentTest {
+
+    @Test
+    void testCompare() {
+        final Student s1 = new Student("Andreas", "Herrmann", 12348);
+        final Student s2 = new Student("Frank", "Herrmann", 22348);
+        final Student s3 = new Student("Alfons", "Meier", 12345);
+        final Student s4 = new Student("Alfons", "Meier", 12346);
+        final Student s5 = new Student("Andreas", "Muster", 12347);
+
+        Student[] a = { s1, s2, s3, s4, s5 };
+        Student[] expected = a.clone();
+
+        Arrays.sort(a);
+        assertArrayEquals(expected, a);
+    }
+}
diff --git a/sources/src/test/java/pr2/interfaces/interfaces_e/test/AnalogControllerTest.java b/sources/src/test/java/pr2/interfaces/interfaces_e/test/AnalogControllerTest.java
new file mode 100644
index 0000000..19a44ab
--- /dev/null
+++ b/sources/src/test/java/pr2/interfaces/interfaces_e/test/AnalogControllerTest.java
@@ -0,0 +1,53 @@
+package pr2.interfaces.interfaces_e.test;
+
+//import org.junit.jupiter.api.Test;
+
+//import tpe.vererbung.interfaces.api.AnalogController;
+//import tpe.vererbung.interfaces.chinesen.AnalogControllerImpl;
+
+/**
+ * Tests für einen analogen Joystick.
+ */
+public class AnalogControllerTest extends DigitalControllerTest {
+//
+//    /**
+//     * Testet einen anlogen Controller.
+//     */
+//    @Test
+//    void testAnalogController() {
+//        AnalogController c = new AnalogControllerImpl();
+//        testAnalogController(c);
+//    }
+//
+//    /**
+//     * Interne Hilfsmethode zum Test von analogen Controllern.
+//     *
+//     * @param c Controller, der getestet wird
+//     */
+//    protected void testAnalogController(AnalogController c) {
+//        c.up(0.5);
+//        assertPointEquals(0, 0, c.getPosition());
+//        c.up(0.5);
+//        assertPointEquals(0, -1, c.getPosition());
+//
+//        c.left(0.3);
+//        c.left(0.3);
+//        c.left(0.3);
+//        assertPointEquals(0, -1, c.getPosition());
+//        c.left(0.2);
+//        assertPointEquals(-1, -1, c.getPosition());
+//
+//        c.down(1.0);
+//        assertPointEquals(-1, 0, c.getPosition());
+//
+//        c.down(1.0);
+//        assertPointEquals(-1, 1, c.getPosition());
+//        c.down(1.0);
+//        assertPointEquals(-1, 2, c.getPosition());
+//
+//        c.right(0.5);
+//        c.right(0.5);
+//        c.right(0.5);
+//        assertPointEquals(0, 2, c.getPosition());
+//    }
+}
diff --git a/sources/src/test/java/pr2/interfaces/interfaces_e/test/DigitalControllerTest.java b/sources/src/test/java/pr2/interfaces/interfaces_e/test/DigitalControllerTest.java
new file mode 100644
index 0000000..85ca8ec
--- /dev/null
+++ b/sources/src/test/java/pr2/interfaces/interfaces_e/test/DigitalControllerTest.java
@@ -0,0 +1,63 @@
+package pr2.interfaces.interfaces_e.test;
+
+import java.awt.Point;
+import org.junit.jupiter.api.Test;
+//
+//import org.junit.jupiter.api.Test;
+import pr2.interfaces.interfaces_e.impl.DigitalControllerImpl;
+import pr2.interfaces.interfaces_e.api.DigitalController;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * Tests für einen digitalen Joystick.
+ */
+public class DigitalControllerTest {
+
+    /**
+     * Testet einen digitalen Controller.
+     */
+    @Test
+    void testDigitalController() {
+        DigitalController c = new DigitalControllerImpl();
+        testDigitalController(c);
+    }
+
+    /**
+     * Interne Hilfsmethode zum Test von digitalen Controllern.
+     *
+     * @param c Controller, der getestet wird
+     */
+    protected void testDigitalController(DigitalController c) {
+        assertPointEquals(0, 0, c.getPosition());
+        c.up();
+        c.up();
+        assertPointEquals(0, -2, c.getPosition());
+        c.down();
+        c.down();
+        assertPointEquals(0, 0, c.getPosition());
+        c.left();
+        c.right();
+        assertPointEquals(0, 0, c.getPosition());
+        c.left();
+        assertPointEquals(-1, 0, c.getPosition());
+        c.left();
+        assertPointEquals(-2, 0, c.getPosition());
+        c.right();
+        c.right();
+        c.right();
+        assertPointEquals(1, 0, c.getPosition());
+    }
+
+    /**
+     * Interne Hilfsmethode, um einen Punkt mit seinem x und
+     * y-Wert zu vergleichen.
+     *
+     * @param x x-Wert
+     * @param y y-Wert
+     * @param point Punkt, der verglichen werden soll
+     */
+    protected void assertPointEquals(int x, int y, Point point) {
+        assertEquals(new Point(x, y), point);
+    }
+}
diff --git a/sources/src/test/java/pr2/interfaces/interfaces_e/test/DualShock4Test.java b/sources/src/test/java/pr2/interfaces/interfaces_e/test/DualShock4Test.java
new file mode 100644
index 0000000..7024ab6
--- /dev/null
+++ b/sources/src/test/java/pr2/interfaces/interfaces_e/test/DualShock4Test.java
@@ -0,0 +1,43 @@
+package pr2.interfaces.interfaces_e.test;
+
+//import org.junit.jupiter.api.Test;
+
+//import pr2.interfaces.interfaces_e.api.DigitalController;
+
+/**
+ * Tests für einen analogen Joystick.
+ */
+public class DualShock4Test extends AnalogControllerTest {
+//
+//    /**
+//     * Testet einen DualShock4 Kombi-Controller.
+//     */
+//    @Test
+//    void testDualShock4() {
+//        DigitalController cd = new DualShock4();
+//        testDigitalController(cd);
+//
+//        AnalogController ca = new DualShock4();
+//        testAnalogController(ca);
+//
+//        DualShock4 ds = new DualShock4();
+//
+//        ds.up();
+//        ds.up(1.0);
+//        assertPointEquals(0, -2, ds.getPosition());
+//
+//        ds.left();
+//        ds.right();
+//        ds.right(0.5);
+//        ds.right(0.5);
+//        assertPointEquals(1, -2, ds.getPosition());
+//
+//        ds.down();
+//        ds.down();
+//        ds.down(0.3);
+//        ds.down(0.3);
+//        ds.down(0.3);
+//        ds.down(0.1);
+//        assertPointEquals(1, 1, ds.getPosition());
+//    }
+}
diff --git a/sources/src/test/java/pr2/interfaces/stack/StackTest.java b/sources/src/test/java/pr2/interfaces/stack/StackTest.java
new file mode 100644
index 0000000..8f058aa
--- /dev/null
+++ b/sources/src/test/java/pr2/interfaces/stack/StackTest.java
@@ -0,0 +1,40 @@
+package pr2.interfaces.stack;
+
+import org.junit.jupiter.api.Test;
+import pr2.interfaces.stack.Stack;
+import pr2.interfaces.stack.StackImpl;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+public class StackTest {
+
+    @Test
+    void testStack() {
+        Stack s = new StackImpl(100);
+
+        assertEquals(0, s.size());
+
+        s.push("Hallo");
+        s.push("wie");
+        s.push("gehts");
+
+        assertEquals(3, s.size());
+
+        assertEquals("gehts", s.peek());
+        assertEquals("gehts", s.pop());
+
+        assertEquals("wie", s.peek());
+        assertEquals("wie", s.pop());
+
+        assertEquals("Hallo", s.peek());
+        assertEquals("Hallo", s.pop());
+
+        assertNull(s.pop());
+        assertEquals(0, s.size());
+
+        s.push("A");
+        assertEquals("A", s.pop());
+        assertNull(s.pop());
+    }
+}
diff --git a/sources/src/test/java/pr2/interfaces/stack/test/StackTest.java b/sources/src/test/java/pr2/interfaces/stack/test/StackTest.java
new file mode 100644
index 0000000..2b12714
--- /dev/null
+++ b/sources/src/test/java/pr2/interfaces/stack/test/StackTest.java
@@ -0,0 +1,36 @@
+package pr2.interfaces.stack.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.interfaces.stack.Stack;
+import pr2.interfaces.stack.StackImpl;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+public class StackTest {
+
+    @Test
+    void testStack() {
+// TODO: Einkommentieren
+//        Stack s = new StackImpl(100);
+//
+//        assertEquals(0, s.size());
+//
+//        s.push("Hallo");
+//        s.push("wie");
+//        s.push("gehts");
+//
+//        assertEquals(3, s.size());
+//
+//        assertEquals("gehts", s.peek());
+//        assertEquals("gehts", s.pop());
+//
+//        assertEquals("wie", s.peek());
+//        assertEquals("wie", s.pop());
+//
+//        assertEquals("Hallo", s.peek());
+//        assertEquals("Hallo", s.pop());
+//
+//        assertNull(s.pop());
+    }
+}
diff --git a/sources/src/test/java/pr2/intro/junit_factorial/test/FakultaetTest.java b/sources/src/test/java/pr2/intro/junit_factorial/test/FakultaetTest.java
new file mode 100644
index 0000000..c6034fa
--- /dev/null
+++ b/sources/src/test/java/pr2/intro/junit_factorial/test/FakultaetTest.java
@@ -0,0 +1,13 @@
+package pr2.intro.junit_factorial.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.intro.junit_factorial.Fakultaet;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class FakultaetTest {
+
+    @Test
+    void testFact() {
+    }
+}
diff --git a/sources/src/test/java/pr2/io/data_output/test/BoardTest.java b/sources/src/test/java/pr2/io/data_output/test/BoardTest.java
new file mode 100644
index 0000000..2068828
--- /dev/null
+++ b/sources/src/test/java/pr2/io/data_output/test/BoardTest.java
@@ -0,0 +1,64 @@
+package pr2.io.data_output.test;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import pr2.io.data_output.Board;
+import pr2.io.data_output.Color;
+
+import java.io.FileOutputStream;
+import java.io.IOException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+
+/**
+ * Test.
+ */
+public class BoardTest {
+
+    private static final byte[] RESULT = new byte[] {
+            0x00, 0x0B, 0x53, 0x63, 0x68, 0x61, 0x63, 0x68, 0x62, 0x72, 0x65,
+            0x74, 0x74, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00,
+            0x00, 0x00, 0x01, 0x00, 0x07, 0x00, 0x00, 0x00, 0x00, 0x01, 0x06,
+            0x00, 0x00, 0x00, 0x01, 0x01, 0x07, 0x00, 0x00, 0x00, 0x00, 0x02,
+            0x04, 0x00, 0x00, 0x00, 0x01, 0x04, 0x05, 0x00, 0x00, 0x00, 0x01,
+            0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0x05, 0x00, 0x00, 0x00,
+            0x00, (byte) 0xff, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF,
+            (byte) 0xFF, (byte) 0xFF
+    };
+
+    /**
+     * Test für die Implementierung des Spielbrettes.
+     *
+     * @throws IOException Datei-Probleme.
+     */
+    @Test
+    void testDame() throws IOException {
+        Board s = new Board();
+        s.set("a1", Color.BLACK);
+        s.set("b1", Color.WHITE);
+        s.set("h1", Color.BLACK);
+        s.set("h2", Color.BLACK);
+        s.set("a8", Color.BLACK);
+        s.set("f8", Color.BLACK);
+        s.set("f5", Color.WHITE);
+        s.set("e3", Color.WHITE);
+        s.set("g2", Color.WHITE);
+
+        String stringRepresentation = s.toString();
+
+        s.writeToFile("/tmp/daten.dat");
+
+        s = Board.loadFromFile("/tmp/daten.dat");
+
+        assertEquals(stringRepresentation, s.toString());
+
+        FileOutputStream fos = new FileOutputStream("/tmp/testdata.dat");
+        fos.write(RESULT);
+        fos.close();
+
+        s = Board.loadFromFile("/tmp/testdata.dat");
+
+        assertEquals(stringRepresentation, s.toString());
+    }
+}
diff --git a/sources/src/test/java/pr2/io/datei_schreiben/test/WriteDataTest.java b/sources/src/test/java/pr2/io/datei_schreiben/test/WriteDataTest.java
new file mode 100644
index 0000000..e50162d
--- /dev/null
+++ b/sources/src/test/java/pr2/io/datei_schreiben/test/WriteDataTest.java
@@ -0,0 +1,39 @@
+package pr2.io.datei_schreiben.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.io.datei_schreiben.WriteData;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+
+/**
+ * Test für die geschriebenen Daten.
+ */
+public class WriteDataTest {
+
+    /**
+     * Geschriebene Daten testen.
+     *
+     * @throws IOException Datei-Probleme.
+     */
+    @Test
+    void testData() throws IOException {
+        final String testFile = "/tmp/test.dat";
+
+        WriteData.main(new String[] { testFile });
+
+        InputStream is = new FileInputStream(testFile);
+
+        byte[] buffer = new byte[10];
+        is.read(buffer);
+        assertArrayEquals(
+                new byte[] {(byte) 0xca, (byte) 0xff, (byte) 0xfe, (byte) 0xba,
+                        (byte) 0xbe, (byte) 0x00, (byte) 0xde, (byte) 0xad,
+                        (byte) 0xbe, (byte) 0xef}, buffer);
+
+        is.close();
+    }
+}
diff --git a/sources/src/test/java/pr2/io/filter/test/UCaseReaderTest.java b/sources/src/test/java/pr2/io/filter/test/UCaseReaderTest.java
new file mode 100644
index 0000000..7c96175
--- /dev/null
+++ b/sources/src/test/java/pr2/io/filter/test/UCaseReaderTest.java
@@ -0,0 +1,35 @@
+package pr2.io.filter.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.io.filter.UCaseReader;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.StringReader;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * Test für die Rot13 "Verschlüsselung".
+ */
+public class UCaseReaderTest {
+
+    /**
+     * Testmethode.
+     *
+     * @throws IOException IO-Probleme
+     */
+    @Test
+    void testReader() throws IOException {
+
+// TODO: Einkommentieren
+//        BufferedReader br = new BufferedReader(
+//                new UCaseReader(new StringReader(
+//                        "Dies ist" + " ein Test für den UCASE-Reader.")));
+//
+//        String line = br.readLine();
+//        assertEquals("DIES IST EIN TEST FÜR DEN UCASE-READER.", line);
+//
+//        br.close();
+    }
+}
diff --git a/sources/src/test/java/pr2/io/random_access/test/FileSortTest.java b/sources/src/test/java/pr2/io/random_access/test/FileSortTest.java
new file mode 100644
index 0000000..d5ac104
--- /dev/null
+++ b/sources/src/test/java/pr2/io/random_access/test/FileSortTest.java
@@ -0,0 +1,62 @@
+package pr2.io.random_access.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.io.random_access.FileSort;
+
+import java.io.*;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * Testet die Sortierung per Random-Access-File.
+ */
+public class FileSortTest {
+
+    /**
+     * Kopiert die Datei f1 als Datei f2.
+     *
+     * @param f1 Quell-Datei
+     * @param f2 Ziel-Datei
+     * @throws IOException IO-Probleme
+     */
+    private static void copyFile(String f1, String f2) throws IOException {
+
+        FileInputStream fis = new FileInputStream(f1);
+        FileOutputStream fos = new FileOutputStream(f2);
+
+        int b;
+
+        while ((b = fis.read()) != -1) {
+            fos.write(b);
+        }
+
+        fis.close();
+        fos.close();
+    }
+
+    /**
+     * Testet die File-Sortierung.
+     *
+     * @throws IOException IO-Problem
+     */
+    @Test
+    void testBubbleSort() throws IOException {
+        String path = getClass().getResource("data.dat").getFile();
+
+        copyFile(path, "/tmp/data.dat");
+        FileSort.sortFile("/tmp/data.dat");
+
+        InputStream is = new FileInputStream("/tmp/data.dat");
+
+        int data;
+        byte lastByte = 0;
+
+        while ((data = is.read()) >= 0) {
+            byte b = (byte) data;
+            assertTrue(b >= lastByte);
+            lastByte = b;
+        }
+
+        is.close();
+    }
+}
diff --git a/sources/src/test/java/pr2/io/serialisierung/test/BoardTest.java b/sources/src/test/java/pr2/io/serialisierung/test/BoardTest.java
new file mode 100644
index 0000000..312d2bb
--- /dev/null
+++ b/sources/src/test/java/pr2/io/serialisierung/test/BoardTest.java
@@ -0,0 +1,42 @@
+package pr2.io.serialisierung.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.io.serialisierung.Board;
+import pr2.io.serialisierung.Color;
+
+import java.io.IOException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * Test.
+ */
+public class BoardTest {
+
+    /**
+     * Test für die Implementierung des Spielbrettes.
+     *
+     * @throws IOException Datei-Probleme.
+     */
+    @Test
+    void testDame() throws IOException {
+        Board s = new Board();
+        s.set("a1", Color.BLACK);
+        s.set("b1", Color.WHITE);
+        s.set("h1", Color.BLACK);
+        s.set("h2", Color.BLACK);
+        s.set("a8", Color.BLACK);
+        s.set("f8", Color.BLACK);
+        s.set("f5", Color.WHITE);
+        s.set("e3", Color.WHITE);
+        s.set("g2", Color.WHITE);
+
+        String stringRepresentation = s.toString();
+
+        s.writeToFile("/tmp/board.dat");
+
+        s = Board.loadFromFile("/tmp/board.dat");
+
+        assertEquals(stringRepresentation, s.toString());
+    }
+}
diff --git a/sources/src/test/java/pr2/lambda/matrixsuche/test/MatrixSucheTest.java b/sources/src/test/java/pr2/lambda/matrixsuche/test/MatrixSucheTest.java
new file mode 100644
index 0000000..4435c33
--- /dev/null
+++ b/sources/src/test/java/pr2/lambda/matrixsuche/test/MatrixSucheTest.java
@@ -0,0 +1,33 @@
+package pr2.lambda.matrixsuche.test;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import pr2.lambda.matrixsuche.MatrixSuche;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+public class MatrixSucheTest {
+
+    @Test
+    void testSuche() {
+
+// TODO: Einkommentieren
+//        int[][] matrix = {
+//                {3, 5, 6, 7, 8},
+//                {10, 12, 14, 16, 18},
+//                {23, 25, 26, 27, 28}
+//        };
+//
+//        Assertions.assertEquals("(0, 1)",
+//                MatrixSuche.findEntry(matrix, 5).toString());
+//        assertEquals("(2, 0)",
+//                MatrixSuche.findEntry(matrix, 23).toString());
+//        assertEquals("(1, 2)",
+//                MatrixSuche.findEntry(matrix, 14).toString());
+//        assertEquals("(0, 4)",
+//                MatrixSuche.findEntry(matrix, 8).toString());
+//        assertNull(
+//                MatrixSuche.findEntry(matrix, 99));
+    }
+}
diff --git a/sources/src/test/java/pr2/lambda/mogrifier_1/test/StringTransmogrifierTest.java b/sources/src/test/java/pr2/lambda/mogrifier_1/test/StringTransmogrifierTest.java
new file mode 100644
index 0000000..1e5bfcb
--- /dev/null
+++ b/sources/src/test/java/pr2/lambda/mogrifier_1/test/StringTransmogrifierTest.java
@@ -0,0 +1,15 @@
+package pr2.lambda.mogrifier_1.test;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import pr2.lambda.mogrifier_1.StringTransmogrifier;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+
+public class StringTransmogrifierTest {
+
+    @Test
+    void testMogrification() {
+        // TODO: Tests durchführen
+    }
+}
diff --git a/sources/src/test/java/pr2/lambda/mogrifier_2/test/StringTransmogrifierTest.java b/sources/src/test/java/pr2/lambda/mogrifier_2/test/StringTransmogrifierTest.java
new file mode 100644
index 0000000..79aff6c
--- /dev/null
+++ b/sources/src/test/java/pr2/lambda/mogrifier_2/test/StringTransmogrifierTest.java
@@ -0,0 +1,38 @@
+package pr2.lambda.mogrifier_2.test;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import pr2.lambda.mogrifier_2.StringFunction;
+import pr2.lambda.mogrifier_2.StringTransmogrifier;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+
+public class StringTransmogrifierTest {
+
+    static final String[] ELEMENTS = {"Hello", "World"};
+
+    @Test
+    void testMogrification() {
+
+
+        Assertions.assertArrayEquals(new String[] {"hello", "world"},
+                StringTransmogrifier.transmogrify(ELEMENTS,
+                        String::toLowerCase));
+
+        assertArrayEquals(new String[] {"HELLO", "WORLD"},
+                StringTransmogrifier.transmogrify(ELEMENTS,
+                        String::toUpperCase));
+
+        assertArrayEquals(new String[] {"Ifmmp", "Xpsme"},
+                StringTransmogrifier.transmogrify(ELEMENTS,
+                        s -> {
+                            char[] c = s.toCharArray();
+                            for (int i = 0; i < c.length; i++) {
+                                c[i] = (char) (c[i] + 1);
+                            }
+                            return new String(c);
+                        }));
+    }
+
+    // TODO: Tests für caesar durchführen
+}
diff --git a/sources/src/test/java/pr2/object/clone_alien/test/AlienCloneTest.java b/sources/src/test/java/pr2/object/clone_alien/test/AlienCloneTest.java
new file mode 100644
index 0000000..c30dff5
--- /dev/null
+++ b/sources/src/test/java/pr2/object/clone_alien/test/AlienCloneTest.java
@@ -0,0 +1,38 @@
+package pr2.object.clone_alien.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.object.clone_alien.Alien;
+import pr2.object.clone_alien.Raumanzug;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotSame;
+
+/**
+ * Test für die Clone-Methoden.
+ */
+public class AlienCloneTest {
+
+    /**
+     * Test-Methode.
+     *
+     * @throws CloneNotSupportedException wird geworfen, wenn clone_alien
+     *                                    nicht korrekt implementiert wurde.
+     */
+    @Test
+    void testClone() throws CloneNotSupportedException {
+// TODO: Einkommentieren
+//        Raumanzug r1 = new Raumanzug();
+//        Alien a1 = new Alien("Predator", r1);
+//
+//        Alien a2 = (Alien) a1.clone();
+//        Raumanzug r2 = a2.getAnzug();
+//
+//        assertNotSame(a1, a2);
+//        assertNotSame(r1, r2);
+//
+//        assertEquals(a1, a2);
+//        assertEquals(r1, r2);
+//        assertEquals(r1.getSauerstoffVorrat(), r2.getSauerstoffVorrat(),
+//                0.0001);
+    }
+}
diff --git a/sources/src/test/java/pr2/object/equals_hashcode/test/WesenTest.java b/sources/src/test/java/pr2/object/equals_hashcode/test/WesenTest.java
new file mode 100644
index 0000000..bdbe397
--- /dev/null
+++ b/sources/src/test/java/pr2/object/equals_hashcode/test/WesenTest.java
@@ -0,0 +1,87 @@
+package pr2.object.equals_hashcode.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.object.equals_hashcode.Ork;
+import pr2.object.equals_hashcode.Wesen;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertNotSame;
+
+/**
+ * Testklasse für die Wesen.
+ */
+public class WesenTest {
+
+    /**
+     * Testet equals und hashCode von Wesen.
+     */
+    @Test
+    void testWesen() {
+        Wesen w1 = new Wesen("Azok", 30);
+        Wesen w2 = new Wesen("Azok", 30);
+        Wesen w3 = new Wesen("Azok", 31);
+        Wesen w4 = new Wesen("Gorrok", 30);
+        Wesen w5 = new Wesen("Gorrok", 31);
+
+        assertNotSame(w1, w2);
+        assertEquals(w1, w2);
+
+        assertNotSame(w1, w3);
+        assertNotEquals(w1, w3);
+
+        assertNotSame(w1, w4);
+        assertNotEquals(w1, w4);
+
+        assertNotSame(w1, w5);
+        assertNotEquals(w1, w5);
+
+        assertEquals(w1.hashCode(), w2.hashCode());
+    }
+
+    /**
+     * Testet equals und hashCode von Ork.
+     */
+    @Test
+    void testOrk() {
+        Ork o1 = new Ork("Snagas", true);
+        Ork o2 = new Ork("Snagas", true);
+        Ork o3 = new Ork("Snagas", false);
+        Ork o4 = new Ork("Berg-Ork", false);
+        Ork o5 = new Ork("Berg-Ork", true);
+        Ork o6 = new Ork("Berg-Ork", false);
+        Wesen w = new Wesen("Snagas", 17);
+
+        assertNotSame(o1, o2);
+        assertEquals(o1, o2);
+
+        assertNotSame(o1, o3);
+        assertNotEquals(o1, o3);
+
+        assertNotSame(o1, o4);
+        assertNotEquals(o1, o4);
+
+        assertNotSame(o1, o5);
+        assertNotEquals(o1, o5);
+
+        assertEquals(o1.hashCode(), o2.hashCode());
+        assertEquals(o4.hashCode(), o6.hashCode());
+
+        assertNotEquals(w, o1);
+        assertNotEquals(w, o2);
+        assertNotEquals(w, o3);
+        assertNotEquals(null, o1);
+        assertNotEquals("Hugo", o1);
+        assertEquals(o1, o1);
+
+        // Diese Tests muss nicht zwangsweise funktionieren, da
+        // ungleiche Objekte einen identischen Hashcode haben können.
+        // Wir gehen hier aber davon aus, dass eine Hashkollision
+        // sehr selten ist und machen daher aus didaktischen Gründen
+        // diesen Test.
+        assertNotEquals(o1.hashCode(), o3.hashCode());
+        assertNotEquals(o1.hashCode(), o4.hashCode());
+        assertNotEquals(o1.hashCode(), o5.hashCode());
+        assertNotEquals(o4.hashCode(), o5.hashCode());
+    }
+}
diff --git a/sources/src/test/java/pr2/streams/chars_1/test/CountLettersTest.java b/sources/src/test/java/pr2/streams/chars_1/test/CountLettersTest.java
new file mode 100644
index 0000000..e18ad24
--- /dev/null
+++ b/sources/src/test/java/pr2/streams/chars_1/test/CountLettersTest.java
@@ -0,0 +1,13 @@
+package pr2.streams.chars_1.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.streams.chars_1.CountLetters;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class CountLettersTest {
+    @Test
+    void testCount() {
+        // TODO: Methode count testen
+    }
+}
diff --git a/sources/src/test/java/pr2/streams/chars_2/test/CountLettersTest.java b/sources/src/test/java/pr2/streams/chars_2/test/CountLettersTest.java
new file mode 100644
index 0000000..446262c
--- /dev/null
+++ b/sources/src/test/java/pr2/streams/chars_2/test/CountLettersTest.java
@@ -0,0 +1,16 @@
+package pr2.streams.chars_2.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.streams.chars_2.CountLetters;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class CountLettersTest {
+    @Test
+    void testCount() {
+        // TODO: Methode count testen
+    }
+}
diff --git a/sources/src/test/java/pr2/streams/chars_3/test/CountLettersTest.java b/sources/src/test/java/pr2/streams/chars_3/test/CountLettersTest.java
new file mode 100644
index 0000000..6e0ed8c
--- /dev/null
+++ b/sources/src/test/java/pr2/streams/chars_3/test/CountLettersTest.java
@@ -0,0 +1,16 @@
+package pr2.streams.chars_3.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.streams.chars_3.CountLetters;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class CountLettersTest {
+    @Test
+    void testCount() {
+        // TODO: Methode count testen
+    }
+}
diff --git a/sources/src/test/java/pr2/streams/filter/test/FilterListTest.java b/sources/src/test/java/pr2/streams/filter/test/FilterListTest.java
new file mode 100644
index 0000000..a807aec
--- /dev/null
+++ b/sources/src/test/java/pr2/streams/filter/test/FilterListTest.java
@@ -0,0 +1,25 @@
+package pr2.streams.filter.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.streams.filter.FilterList;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class FilterListTest {
+
+    @Test
+    void testFilter() {
+        List<String> liste = Arrays.asList(
+                "Hallo", "Welt", "Dampfschifffahrt", "Hundekuchen",
+                "Fiction", "Java", "Visual Basic", "Drucker");
+
+        List<String> result = Arrays.asList(
+                "hallo", "dampfschifffahrt", "hundekuchen",
+                "fiction", "visual basic", "drucker");
+
+        assertEquals(result, FilterList.filter(liste));
+    }
+}
diff --git a/sources/src/test/java/pr2/streams/reduce/test/SquarerTest.java b/sources/src/test/java/pr2/streams/reduce/test/SquarerTest.java
new file mode 100644
index 0000000..638f9c2
--- /dev/null
+++ b/sources/src/test/java/pr2/streams/reduce/test/SquarerTest.java
@@ -0,0 +1,26 @@
+package pr2.streams.reduce.test;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import pr2.streams.reduce.Squarer;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class SquarerTest {
+
+    @Test
+    void testMitMap() {
+        List<Integer> l = Arrays.asList(1, 5, 8, 9, 12, 10, 3);
+        Assertions.assertEquals(424, Squarer.mitMap(l));
+    }
+
+    @Test
+    void testOhneMap() {
+        List<Integer> l = Arrays.asList(1, 5, 8, 9, 12, 10, 3);
+        assertEquals(424, Squarer.ohneMap(l));
+    }
+
+}
diff --git a/sources/src/test/java/pr2/streams/summieren/test/SumUpTest.java b/sources/src/test/java/pr2/streams/summieren/test/SumUpTest.java
new file mode 100644
index 0000000..bec5b46
--- /dev/null
+++ b/sources/src/test/java/pr2/streams/summieren/test/SumUpTest.java
@@ -0,0 +1,18 @@
+package pr2.streams.summieren.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.streams.summieren.SumUp;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class SumUpTest {
+
+    @Test
+    void testSum() {
+        List<Integer> l = Arrays.asList(1, 5, 8, 9, 12, 10, 3);
+        assertEquals(48, SumUp.sumUp(l.stream()));
+    }
+}
diff --git a/sources/src/test/java/pr2/streams/word_count/test/WordCountTest.java b/sources/src/test/java/pr2/streams/word_count/test/WordCountTest.java
new file mode 100644
index 0000000..43dbcf8
--- /dev/null
+++ b/sources/src/test/java/pr2/streams/word_count/test/WordCountTest.java
@@ -0,0 +1,21 @@
+package pr2.streams.word_count.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.streams.word_count.WordCount;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class WordCountTest {
+
+    @Test
+    void testWordCount() {
+        List<String> liste = Arrays.asList("A", "A", "B", "B", "B", "C",
+                "D", "D", "E", "E", "E", "F");
+
+        assertEquals(Arrays.asList("A->2", "B->3", "C->1", "D->2",
+                "E->3", "F->1"), WordCount.count(liste));
+    }
+}
diff --git a/sources/src/test/java/pr2/strukturierung/information_hiding/test/RechnerTest.java b/sources/src/test/java/pr2/strukturierung/information_hiding/test/RechnerTest.java
new file mode 100644
index 0000000..852894f
--- /dev/null
+++ b/sources/src/test/java/pr2/strukturierung/information_hiding/test/RechnerTest.java
@@ -0,0 +1,38 @@
+package pr2.strukturierung.information_hiding.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.strukturierung.information_hiding.Rechner;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * Unit-Test für den Rechner.
+ */
+public class RechnerTest {
+
+    /**
+     * Testet alle Grundoperationen des Rechners.
+     */
+    @Test
+    void testRechner() {
+        Rechner r = new Rechner();
+
+        // 2 + 2 = 4
+        r.addiere(2.0, 2.0);
+        assertEquals(4.0, r.wert, 0.0001);
+
+        // 3 - 1 = 2
+        r.subtrahiere(3, 1);
+        assertEquals(2.0, r.wert, 0.0001);
+
+        // 3 * 3 = 9
+        r.multipliziere(3, 3);
+        assertEquals(9.0, r.wert, 0.0001);
+
+        // 2 + 2 * 2 = 6
+        r.multipliziere(2, 2);
+        r.speichern();
+        r.addiere(2, r.speicher);
+        assertEquals(6.0, r.wert, 0.0001);
+    }
+}
diff --git a/sources/src/test/java/pr2/vererbung/konstruktoren/test/WesenTest.java b/sources/src/test/java/pr2/vererbung/konstruktoren/test/WesenTest.java
new file mode 100644
index 0000000..1732f9e
--- /dev/null
+++ b/sources/src/test/java/pr2/vererbung/konstruktoren/test/WesenTest.java
@@ -0,0 +1,49 @@
+package pr2.vererbung.konstruktoren.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.vererbung.konstruktoren.Nachtelf;
+import pr2.vererbung.konstruktoren.Untoter;
+import pr2.vererbung.konstruktoren.Wesen;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * Test für die Aufgabe.
+ */
+public class WesenTest {
+
+    /**
+     * Testet den Nachtelf.
+     */
+    @Test
+    void testNachtelf() {
+// TODO: Einkommentieren
+//        assertTrue(new Nachtelf("") instanceof Wesen,
+//                "Nachtelf erbt nicht " + "von Wesen");
+//
+//        assertEquals(Nachtelf.STANDARD_NATURWIDERSTAND,
+//                new Nachtelf("").getNaturwiderstand());
+//
+//        assertEquals(120, new Nachtelf("", 120).getNaturwiderstand());
+//
+//        assertEquals("Hugo", new Nachtelf("Hugo").getName());
+    }
+
+    /**
+     * Testet den Untoten.
+     */
+    @Test
+    void testUntoten() {
+// TODO: Einkommentieren
+//        assertTrue(new Untoter("") instanceof Wesen,
+//                "Untoter erbt nicht von " + "Wesen");
+//
+//        assertEquals(Untoter.STANDARD_UNTERWASSERATMUNG,
+//                new Untoter("").getUnterwasseratmung());
+//
+//        assertEquals(120, new Untoter("", 120).getUnterwasseratmung());
+//
+//        assertEquals("Hugo", new Untoter("Hugo").getName());
+    }
+}
diff --git a/sources/src/test/java/pr2/vererbung/ueberladen_summe/SummatorTest.java b/sources/src/test/java/pr2/vererbung/ueberladen_summe/SummatorTest.java
new file mode 100644
index 0000000..77ac6ef
--- /dev/null
+++ b/sources/src/test/java/pr2/vererbung/ueberladen_summe/SummatorTest.java
@@ -0,0 +1,26 @@
+package pr2.vererbung.ueberladen_summe;
+
+import org.junit.jupiter.api.Test;
+import pr2.vererbung.ueberladen_summe.Summator;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class SummatorTest {
+
+    @Test
+    void testSum() {
+        Summator s = new Summator();
+        assertEquals(3, s.sum(1, 2));
+        assertEquals(1, s.sum(-1, 2));
+        assertEquals(6, s.sum(1, 2, 3));
+        assertEquals(0, s.sum(1, 2, -3));
+        assertEquals(10, s.sum(1, 2, 3, 4));
+        assertEquals(2, s.sum(1, 2, 3, -4));
+        assertEquals(15, s.sum(1, 2, 3, 4, 5));
+        assertEquals(5, s.sum(1, 2, 3, 4, -5));
+        assertEquals(0, s.sum(0, 0));
+        assertEquals(0, s.sum(0, 0, 0));
+        assertEquals(0, s.sum(0, 0, 0, 0));
+        assertEquals(0, s.sum(0, 0,0, 0, 0));
+    }
+}
diff --git a/sources/src/test/java/pr2/vererbung/ueberladen_summe/test/SummatorTest.java b/sources/src/test/java/pr2/vererbung/ueberladen_summe/test/SummatorTest.java
new file mode 100644
index 0000000..5d3496b
--- /dev/null
+++ b/sources/src/test/java/pr2/vererbung/ueberladen_summe/test/SummatorTest.java
@@ -0,0 +1,23 @@
+package pr2.vererbung.ueberladen_summe.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.vererbung.ueberladen_summe.Summator;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class SummatorTest {
+
+    @Test
+    void testSum() {
+// TODO: Einkommentieren
+//        Summator s = new Summator();
+//        assertEquals(3, s.sum(1, 2));
+//        assertEquals(1, s.sum(-1, 2));
+//        assertEquals(6, s.sum(1, 2, 3));
+//        assertEquals(0, s.sum(1, 2, -3));
+//        assertEquals(10, s.sum(1, 2, 3, 4));
+//        assertEquals(2, s.sum(1, 2, 3, -4));
+//        assertEquals(15, s.sum(1, 2, 3, 4, 5));
+//        assertEquals(5, s.sum(1, 2, 3, 4, -5));
+    }
+}
diff --git a/sources/src/test/java/pr2/vererbung/vararg_summe/SummatorTest.java b/sources/src/test/java/pr2/vererbung/vararg_summe/SummatorTest.java
new file mode 100644
index 0000000..33b55c4
--- /dev/null
+++ b/sources/src/test/java/pr2/vererbung/vararg_summe/SummatorTest.java
@@ -0,0 +1,23 @@
+package pr2.vererbung.vararg_summe;
+
+import org.junit.jupiter.api.Test;
+import pr2.vererbung.vararg_summe.Summator;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class SummatorTest {
+
+    @Test
+    void testSum() {
+        Summator s = new Summator();
+        assertEquals(3, s.sum(1, 2));
+        assertEquals(1, s.sum(-1, 2));
+        assertEquals(6, s.sum(1, 2, 3));
+        assertEquals(0, s.sum(1, 2, -3));
+        assertEquals(10, s.sum(1, 2, 3, 4));
+        assertEquals(2, s.sum(1, 2, 3, -4));
+        assertEquals(15, s.sum(1, 2, 3, 4, 5));
+        assertEquals(5, s.sum(1, 2, 3, 4, -5));
+        assertEquals(36, s.sum(1, 2, 3, 4, 5, 6, 7, 8));
+    }
+}
diff --git a/sources/src/test/java/pr2/vererbung/vararg_summe/test/SummatorTest.java b/sources/src/test/java/pr2/vererbung/vararg_summe/test/SummatorTest.java
new file mode 100644
index 0000000..2b8ab32
--- /dev/null
+++ b/sources/src/test/java/pr2/vererbung/vararg_summe/test/SummatorTest.java
@@ -0,0 +1,24 @@
+package pr2.vererbung.vararg_summe.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.vererbung.vararg_summe.Summator;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class SummatorTest {
+
+    @Test
+    void testSum() {
+// TODO: Einkommentieren
+//        Summator s = new Summator();
+//        assertEquals(3, s.sum(1, 2));
+//        assertEquals(1, s.sum(-1, 2));
+//        assertEquals(6, s.sum(1, 2, 3));
+//        assertEquals(0, s.sum(1, 2, -3));
+//        assertEquals(10, s.sum(1, 2, 3, 4));
+//        assertEquals(2, s.sum(1, 2, 3, -4));
+//        assertEquals(15, s.sum(1, 2, 3, 4, 5));
+//        assertEquals(5, s.sum(1, 2, 3, 4, -5));
+//        assertEquals(36, s.sum(1, 2, 3, 4, 5, 6, 7, 8));
+    }
+}
diff --git a/sources/src/test/java/pr2/vererbung/vererbung_geometrie/FigurenTest.java b/sources/src/test/java/pr2/vererbung/vererbung_geometrie/FigurenTest.java
new file mode 100644
index 0000000..430d7fa
--- /dev/null
+++ b/sources/src/test/java/pr2/vererbung/vererbung_geometrie/FigurenTest.java
@@ -0,0 +1,67 @@
+package pr2.vererbung.vererbung_geometrie;
+
+import org.junit.jupiter.api.Test;
+import pr2.vererbung.vererbung_geometrie.Dreieck;
+import pr2.vererbung.vererbung_geometrie.Gerade;
+import pr2.vererbung.vererbung_geometrie.Quadrat;
+import pr2.vererbung.vererbung_geometrie.Rechteck;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * Tests für die Figuren.
+ */
+public class FigurenTest {
+
+    private static final double PRECISION = 0.0001;
+
+    /**
+     * Rechteck.
+     */
+    @Test
+    void testReckteck() {
+        Rechteck r1 = new Rechteck(4.0, 5.0);
+        Rechteck r2 = new Rechteck(0.0, 3.0);
+        assertEquals(20.0, r1.getFlaeche(), PRECISION);
+        assertEquals(0.0, r2.getFlaeche(), PRECISION);
+    }
+
+    /**
+     * Dreieck.
+     */
+    @Test
+    void testDreieck() {
+        Dreieck d1 = new Dreieck(6.0, 3.5);
+        assertEquals(10.5, d1.getFlaeche(), PRECISION);
+    }
+
+    /**
+     * Gerade.
+     */
+    @Test
+    void testGerade() {
+        Gerade g1 = new Gerade(8.0);
+        assertEquals(8.0, g1.getLaenge(), PRECISION);
+        assertEquals(0.0, g1.getFlaeche(), PRECISION);
+
+        g1 = new Gerade(0.0);
+        assertEquals(0.0, g1.getLaenge(), PRECISION);
+        assertEquals(0.0, g1.getFlaeche(), PRECISION);
+    }
+
+    /**
+     * Quadrat.
+     */
+    @Test
+    void testQuadrat() {
+        Quadrat q1 = new Quadrat(3.0);
+        assertEquals(9.0, q1.getFlaeche(), PRECISION);
+
+        Rechteck r1 = new Rechteck(5.0, 5.0);
+        Quadrat q2 = new Quadrat(5.0);
+        assertEquals(r1.getFlaeche(), q2.getFlaeche(), PRECISION);
+
+        q1 = new Quadrat(0.0);
+        assertEquals(0.0, q1.getFlaeche(), PRECISION);
+    }
+}
diff --git a/sources/src/test/java/pr2/vererbung/vererbung_geometrie/test/FigurenTest.java b/sources/src/test/java/pr2/vererbung/vererbung_geometrie/test/FigurenTest.java
new file mode 100644
index 0000000..3dc462c
--- /dev/null
+++ b/sources/src/test/java/pr2/vererbung/vererbung_geometrie/test/FigurenTest.java
@@ -0,0 +1,71 @@
+package pr2.vererbung.vererbung_geometrie.test;
+
+import org.junit.jupiter.api.Test;
+import pr2.vererbung.vererbung_geometrie.Dreieck;
+import pr2.vererbung.vererbung_geometrie.Gerade;
+import pr2.vererbung.vererbung_geometrie.Quadrat;
+import pr2.vererbung.vererbung_geometrie.Rechteck;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * Tests für die Figuren.
+ */
+public class FigurenTest {
+
+    private static final double PRECISION = 0.0001;
+
+    /**
+     * Rechteck.
+     */
+    @Test
+    void testReckteck() {
+// TODO: Einkommentieren
+//        Rechteck r1 = new Rechteck(4.0, 5.0);
+//        Rechteck r2 = new Rechteck(0.0, 3.0);
+//        assertEquals(20.0, r1.getFlaeche(), PRECISION);
+//        assertEquals(0.0, r2.getFlaeche(), PRECISION);
+    }
+
+    /**
+     * Dreieck.
+     */
+    @Test
+    void testDreieck() {
+// TODO: Einkommentieren
+//        Dreieck d1 = new Dreieck(6.0, 3.5);
+//        assertEquals(10.5, d1.getFlaeche(), PRECISION);
+    }
+
+    /**
+     * Gerade.
+     */
+    @Test
+    void testGerade() {
+// TODO: Einkommentieren
+//        Gerade g1 = new Gerade(8.0);
+//        assertEquals(8.0, g1.getLaenge(), PRECISION);
+//        assertEquals(0.0, g1.getFlaeche(), PRECISION);
+//
+//        g1 = new Gerade(0.0);
+//        assertEquals(0.0, g1.getLaenge(), PRECISION);
+//        assertEquals(0.0, g1.getFlaeche(), PRECISION);
+    }
+
+    /**
+     * Quadrat.
+     */
+    @Test
+    void testQuadrat() {
+// TODO: Einkommentieren
+//        Quadrat q1 = new Quadrat(3.0);
+//        assertEquals(9.0, q1.getFlaeche(), PRECISION);
+//
+//        Rechteck r1 = new Rechteck(5.0, 5.0);
+//        Quadrat q2 = new Quadrat(5.0);
+//        assertEquals(r1.getFlaeche(), q2.getFlaeche(), PRECISION);
+//
+//        q1 = new Quadrat(0.0);
+//        assertEquals(0.0, q1.getFlaeche(), PRECISION);
+    }
+}