Added application main loop for updating, printing the games and quiting at anytime with test for correctly terminating.

src/main/java/Application/App.java

@@ -0,0 +1,46 @@
+package Application;
+
+import Game.Tictactoe;
+
+public class App {
+
+    private boolean isRunning = false;
+    private Cli cli;
+
+    private Tictactoe ttt;
+
+    public App(Cli cli) {
+        this.cli = cli;
+        init();
+    }
+
+    private void init() {
+        ttt = new Tictactoe();
+        cli.getPrintStream().println("Welcome to the Cli Arcade Service!");
+        cli.getPrintStream().println("Press 'q' at any time to stop the application");
+        ttt.print(cli);
+    }
+
+    public void start() {
+        isRunning = true;
+        while (isRunning) {
+            String input = cli.getScanner().next();
+            if (input.equals("q")) {
+                stop();
+                return;
+            } else {
+                ttt.update(input);
+                ttt.print(cli);
+            }
+        }
+    }
+
+    public void stop() {
+        isRunning = false;
+        cli.getPrintStream().println("Stopping application...");
+    }
+
+    public boolean isRunning() {
+        return isRunning;
+    }
+}

src/main/java/Main.java

@@ -1,3 +1,4 @@
+import Application.App;
 import Application.Cli;
 import Game.Tictactoe;
 
@@ -6,13 +7,8 @@ import java.util.Scanner;
 public class Main {
 
     public static void main(String[] args) {
-        Tictactoe ttt = new Tictactoe();
         Cli cli = new Cli(System.out, System.in);
-        Scanner scan = cli.getScanner();
-        ttt.print(cli);
-        while (scan.hasNext()) {
-            ttt.update(scan.next());
-            ttt.print(cli);
-        }
+        App app = new App(cli);
+        app.start();
     }
 }

src/test/java/Application/AppTest.java

@@ -0,0 +1,42 @@
+package Application;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.io.*;
+import java.nio.charset.StandardCharsets;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+class AppTest {
+
+    private final ByteArrayOutputStream outContent = new ByteArrayOutputStream();
+    private final ByteArrayInputStream inContent = new ByteArrayInputStream("1\n2\nq\n".getBytes());
+
+    App app;
+    Cli cli;
+
+    @BeforeEach
+    void setUp() {
+        cli = new Cli(new PrintStream(outContent), inContent);
+        app = new App(cli);
+    }
+
+    @AfterEach
+    void tearDown() {
+    }
+
+    //inContent has the 'q' at the end, to terminated the loop and set isRunning to false
+    @Test
+    void stop() {
+        ByteArrayInputStream input = new ByteArrayInputStream("1\n2\nq\n".getBytes());
+        cli = new Cli(new PrintStream(outContent), input);
+        app = new App(cli);
+        app.start();
+        assertFalse(app.isRunning());
+    }
+
+}