tictactoe: added method countCharsInRow

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

@@ -55,4 +55,8 @@ public class AIHard implements TicTacToeAI {
 			gl.setField(row, col, AI_CHAR);
 		}
 	}
+	
+	public int countCharsInRow(int index, char charToCount) {
+		return 0;
+	}
 }

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

@@ -1,9 +1,15 @@
 package de.tims.tictactoe.ai;
 
+import static org.assertj.core.api.Assertions.*;
 import static org.mockito.Mockito.*;
 
+import java.util.stream.Stream;
+
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
 import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
 
@@ -59,5 +65,22 @@ class AIHardTest {
 		
 		verify(gl, times(1)).setField(0, 2, realChar);
 	}
+	
+	@ParameterizedTest
+	@MethodSource("testCasesForCountCharsInRow")
+	void countCharsInRowTest(String testName, char[][] board, int rowNum, char charToCount, int expectedResult) {
+		doReturn(board).when(gl).getBoard();
+		
+		AIHard ai = new AIHard(gl);
+		int realResult = ai.countCharsInRow(rowNum, charToCount);
+		
+		assertThat(realResult).describedAs(testName).isEqualTo(expectedResult);
+	}
+	
+	private static Stream<Arguments> testCasesForCountCharsInRow() {
+		return Stream.of(Arguments.of("EmptyFieldReturns0", 
+				new char[][] { {'-', '-', '-'}, {'-', '-', '-'}, {'-', '-', '-'} },
+				0, 'o', 0));
+	}
 
 }