JUnit-Tests hinzugefügt

Axel/src/de/hs_mannheim/informatik/spreadsheet/SpreadsheetTest.java

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+package de.hs_mannheim.informatik.spreadsheet;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class SpreadsheetTest {
+
+    @Test
+    void sum() {
+    }
+
+    @Test
+    void pro() {
+    }
+
+    @Test
+    void min() {
+    }
+
+    @Test
+    void max() {
+    }
+
+    @Test
+    void mittelwert() {
+    }
+
+    @Test
+    void calculate() {
+        Spreadsheet spr = new Spreadsheet(20,20);
+
+        assertEquals(spr.calculate("20+2"), 22);
+        assertEquals(spr.calculate("4-3"), 1);
+        assertEquals(spr.calculate("3*3"), 9);
+        assertEquals(spr.calculate("9/3"), 3);
+
+
+        spr.put("A1", "3");
+        spr.put("A2", "3");
+
+        assertEquals(spr.calculate("A1+20"), 23);
+
+        assertEquals(spr.calculate("A1+A2"), 6);
+        assertEquals(spr.calculate("A1-A2"), 0);
+        assertEquals(spr.calculate("A1*A2"), 9);
+        assertEquals(spr.calculate("A1/A2"), 1);
+    }
+
+    @Test
+    void rechne() {
+        // 1 = +, 2 = -, 3 = *, 4 = /
+        //assertEquals(Spreadsheet.rechne(), );
+    }
+}