Added Update Function to GameManager

src/main/java/pacmanGame/GameManager.java

@@ -4,9 +4,16 @@ public class GameManager {
 	public int time = 0;
 	
 	public Map map;
+	public Visualizer visualizer;
 	
 	public GameManager() {
 		map = new Map();
+		visualizer = new VisualizerPlainText(this);
+	}
+
+	public void Update() {
+		visualizer.Update();
+		
+		time++;
 	}
-	
 }

src/test/java/pacmanTests/GameManagerTest.java

@@ -0,0 +1,51 @@
+package pacmanTests;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+import pacmanGame.GameManager;
+import pacmanGame.Map;
+import pacmanGame.VisualizerPlainText;
+
+
+class GameManagerTest {
+
+	@Test
+	void GameManager_Update_increasesTime() {
+		// arrange
+
+		GameManager gameManager = new GameManager();
+		VisualizerPlainText vpt = new VisualizerPlainText(gameManager);
+		
+		// act
+
+		int initialTime = gameManager.time;
+		gameManager.Update();
+		int updatedTime = gameManager.time;
+		
+		int expectedUpdatedTime = initialTime + 1;
+		
+		// assert
+		assertThat(expectedUpdatedTime).isEqualTo(updatedTime);
+	}
+
+	@Test
+	void GameManager_Update_updatesVisualizer() {
+		// arrange
+
+		GameManager gameManager = new GameManager();
+		VisualizerPlainText vpt = (VisualizerPlainText) gameManager.visualizer;
+		
+		// act
+
+		String initialVptOutput = (String)vpt.GetOutput();
+		gameManager.Update();
+		String updatedVptOutput = (String)vpt.GetOutput();
+		
+		
+		// assert
+		assertThat(initialVptOutput).isNotEqualTo(updatedVptOutput);
+	}
+}