tictactoe: added method countCharsInDiag

src/main/java/de/tims/tictactoe/ai/AIHard.java

@@ -77,4 +77,8 @@ public class AIHard implements TicTacToeAI {
 		
 		return count;
 	}
+	
+	public int countCharsInDiag(int index, char charToCount) {
+		return 0;
+	}
 }

src/test/java/de/tims/tictactoe/ai/AIHardTest.java

@@ -88,11 +88,11 @@ class AIHardTest {
 	
 	@ParameterizedTest
 	@MethodSource("testCasesForCountCharsInCol")
-	void countCharsInColTest(String testName, char[][] board, int rowNum, char charToCount, int expectedResult) {
+	void countCharsInColTest(String testName, char[][] board, int colNum, char charToCount, int expectedResult) {
 		doReturn(board).when(gl).getBoard();
 		
 		AIHard ai = new AIHard(gl);
-		int realResult = ai.countCharsInCol(rowNum, charToCount);
+		int realResult = ai.countCharsInCol(colNum, charToCount);
 		
 		assertThat(realResult).describedAs(testName).isEqualTo(expectedResult);
 	}
@@ -106,4 +106,21 @@ class AIHardTest {
 						1, 'o', 1));
 	}
 	
+	@ParameterizedTest
+	@MethodSource("testCasesForCountCharsInDiag")
+	void countCharsInDiagTest(String testName, char[][] board, int diagNum, char charToCount, int expectedResult) {
+		doReturn(board).when(gl).getBoard();
+		
+		AIHard ai = new AIHard(gl);
+		int realResult = ai.countCharsInDiag(diagNum, charToCount);
+		
+		assertThat(realResult).describedAs(testName).isEqualTo(expectedResult);
+	}
+	
+	private static Stream<Arguments> testCasesForCountCharsInDiag() {
+		return Stream.of(Arguments.of("EmptyFieldReturns0", 
+						new char[][] { {'-', '-', '-'}, {'-', '-', '-'}, {'-', '-', '-'} },
+						0, 'o', 0));
+	}
+
 }