set variable player1 & player2 to final

deleted unnecessary import in Test classes
added outputTieText to class Game

test/GameTest.java

@@ -1,4 +1,3 @@
-import org.junit.Assert;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -6,6 +5,8 @@ import org.junit.jupiter.api.Test;
 import java.io.ByteArrayOutputStream;
 import java.io.PrintStream;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
 /**
  * Klasse GameTest
  *
@@ -67,7 +68,7 @@ class GameTest {
         System.out.println("Hello Baeldung Readers!!");
         System.out.println("Hello Baeldung Readers!!");
 
-        Assert.assertEquals("Hello Baeldung Readers!!\n" +
+        assertEquals("Hello Baeldung Readers!!\n" +
                 "Hello Baeldung Readers!!\n" +
                 "Hello Baeldung Readers!!\n" +
                 "Hello Baeldung Readers!!", outputStreamCaptor.toString()

test/GamefieldTest.java

@@ -1,4 +1,3 @@
-import org.junit.Before;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -32,5 +31,6 @@ class GamefieldTest {
 
     @Test
     void outputField() {
+        gamefield.outputField();
     }
 }