tictactoe: refactored test code to use one game instance object for all test cases

src/test/java/de/tims/tictactoe/GameLogicTest.java

@@ -3,33 +3,31 @@ package de.tims.tictactoe;
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
-import java.util.Arrays;
 import java.util.stream.Stream;
 
 import org.junit.jupiter.api.BeforeAll;
-import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.api.TestInstance.Lifecycle;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
 
+@TestInstance(Lifecycle.PER_CLASS)
 class GameLogicTest {
 
-	private int size = 3;
-	private GameLogic game = new GameLogic(size);
+	private final int SIZE = 3;
+	private GameLogic game;
 	
 	@BeforeAll
-	static void setUpBeforeClass() throws Exception {
-	}
-
-	@BeforeEach
-	void setUp() throws Exception {
+	void setUpBeforeClass() throws Exception {
+		this.game = new GameLogic(SIZE);
 	}
 
 	@Test
 	void createGameLogicTest() {
 		GameLogic expectedResult = this.game;
-		GameLogic realResult = new GameLogic(size);
+		GameLogic realResult = new GameLogic(SIZE);
 		
 		assertEquals(expectedResult.getClass(), realResult.getClass());
 	}
@@ -79,7 +77,7 @@ class GameLogicTest {
 								    											  {'-', '-', '-'},
 								    											  {'-', '-', '-'}}),
 					    Arguments.of("set field [1][0] for player 2", 1, 0, 'o', new char[][] 
-																				 {{'-', '-', '-'}, 
+																				 {{'x', '-', '-'}, 
 																				  {'o', '-', '-'},
 																				  {'-', '-', '-'}})
 		    		);