Add change manager unit test skeleton

pom.xml

@@ -165,6 +165,9 @@
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-surefire-plugin</artifactId>
 				<version>3.0.0-M5</version>
+				<configuration>
+					<argLine>--add-opens dev.kske.undoredo/dev.kske.undoredo=ALL-UNNAMED</argLine>
+				</configuration>
 			</plugin>
 			
 		</plugins>

src/test/java/dev/kske/undoredo/ChangeManagerTest.java

@@ -0,0 +1,76 @@
+package dev.kske.undoredo;
+
+import static org.junit.jupiter.api.Assertions.fail;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * @author Kai S. K. Engelbart
+ * @since 0.0.1
+ */
+class ChangeManagerTest {
+
+	/**
+	 * Test method for {@link dev.kske.undoredo.ChangeManager#addChange(dev.kske.undoredo.Change)}.
+	 */
+	@Test
+	void testAddChange() {
+		fail("Not yet implemented");
+	}
+
+	/**
+	 * Test method for {@link dev.kske.undoredo.ChangeManager#undo()}.
+	 */
+	@Test
+	void testUndo() {
+		fail("Not yet implemented");
+	}
+
+	/**
+	 * Test method for {@link dev.kske.undoredo.ChangeManager#redo()}.
+	 */
+	@Test
+	void testRedo() {
+		fail("Not yet implemented");
+	}
+
+	/**
+	 * Test method for {@link dev.kske.undoredo.ChangeManager#mark()}.
+	 */
+	@Test
+	void testMark() {
+		fail("Not yet implemented");
+	}
+
+	/**
+	 * Test method for {@link dev.kske.undoredo.ChangeManager#isAtMarkedIndex()}.
+	 */
+	@Test
+	void testIsAtMarkedIndex() {
+		fail("Not yet implemented");
+	}
+
+	/**
+	 * Test method for {@link dev.kske.undoredo.ChangeManager#isUndoAvailable()}.
+	 */
+	@Test
+	void testIsUndoAvailable() {
+		fail("Not yet implemented");
+	}
+
+	/**
+	 * Test method for {@link dev.kske.undoredo.ChangeManager#isRedoAvailable()}.
+	 */
+	@Test
+	void testIsRedoAvailable() {
+		fail("Not yet implemented");
+	}
+
+	/**
+	 * Test method for {@link dev.kske.undoredo.ChangeManager#getChanges()}.
+	 */
+	@Test
+	void testGetChanges() {
+		fail("Not yet implemented");
+	}
+}