add simple mocking demo

.gitignore

@@ -1 +0,0 @@
-/.DS_Store

MvnDemo/.gitignore

@@ -2,4 +2,3 @@
 /.DS_Store
 /.classpath
 /.project
-/.settings

MvnDemo/.settings/.gitignore

@@ -0,0 +1,3 @@
+/org.eclipse.core.resources.prefs
+/org.eclipse.jdt.core.prefs
+/org.eclipse.m2e.core.prefs

MvnDemo/pom.xml

@@ -27,6 +27,13 @@
 			<scope>test</scope>
 		</dependency>
 
+		<dependency>
+			<groupId>org.mockito</groupId>
+			<artifactId>mockito-core</artifactId>
+			<version>5.17.0</version>
+			<scope>test</scope>
+		</dependency>
+
 		<dependency>
 			<groupId>org.apache.logging.log4j</groupId>
 			<artifactId>log4j-core</artifactId>
@@ -48,23 +55,6 @@
 				</configuration>
 			</plugin>
 
-			<!-- Testing -->
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-surefire-plugin</artifactId>
-				<version>3.5.3</version>
-				<configuration>
-					<includes>
-						<include>**/*Test.java</include>
-					</includes>
-					<excludes>
-						<exclude>**/IntegrationTest.java</exclude>
-					</excludes>
-					<parallel>classes</parallel>
-					<threadCount>4</threadCount>
-				</configuration>
-			</plugin>
-
 			<!-- JAR creation -->
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>

MvnDemo/src/.gitignore

@@ -1 +0,0 @@
-/.DS_Store

MvnDemo/src/main/.gitignore

@@ -1 +0,0 @@
-/.DS_Store

MvnDemo/src/main/java/de/hs_mannheim/informatik/mvn/mocking/CountWords.java

@@ -0,0 +1,28 @@
+package de.hs_mannheim.informatik.mvn.mocking;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class CountWords {
+
+	public static void main(String[] args) {
+		var cnt = new CountWords().countWords("Der schnelle braune Fuchs springt über den mueden Hund. Der Hund liegt nur muede herum.");
+		cnt.entrySet().stream().forEach(e -> System.out.println(e.getKey() + ": " + e.getValue()));
+	}
+	
+	public Map<String, Integer> countWords(String text) {
+		var words = text.toLowerCase().split("\\W+");
+		var cnt = new HashMap<String, Integer>();
+		
+		for (String w : words) {
+			cnt.put(w, cnt.getOrDefault(w, 0) + 1);
+		}
+		
+		return cnt;
+	}
+	
+	public Map<String, Integer> countWordsFromFile(TextExtractor te, String path) {
+		return this.countWords(te.extractText(path));
+	}
+
+}

MvnDemo/src/main/java/de/hs_mannheim/informatik/mvn/mocking/TextExtractor.java

@@ -0,0 +1,5 @@
+package de.hs_mannheim.informatik.mvn.mocking;
+
+public abstract class TextExtractor {	
+	public abstract String extractText(String path);
+}

MvnDemo/src/test/java/de/hs_mannheim/informatik/mvn/mocking/TextExtractorTest.java

@@ -0,0 +1,37 @@
+package de.hs_mannheim.informatik.mvn.mocking;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+class TextExtractorTest {
+
+	@Test
+	void testCountWords() {
+		CountWords cw = new CountWords();
+		var cnt = cw.countWords("hallo welt");
+		
+		assertEquals(1, cnt.get("hallo"));
+		assertEquals(1, cnt.get("welt"));
+		
+		assertEquals(null, cnt.get("unbekannt"));
+	}
+	
+	@Test
+	void testCountWordsFromFile() {
+		CountWords cw = new CountWords();
+		
+		TextExtractor teMock = Mockito.mock(TextExtractor.class);
+		when(teMock.extractText("/tmp/test.pdf")).thenReturn("hallo welt");
+		
+		var cnt = cw.countWordsFromFile(teMock, "/tmp/test.pdf");
+		
+		assertEquals(1, cnt.get("hallo"));
+		assertEquals(1, cnt.get("welt"));
+		
+		assertEquals(null, cnt.get("unbekannt"));
+	}
+
+}