player_management: added method selectPlayer, added method equals and

hashCode in class Player

src/main/java/de/tims/player_management/Player.java

@@ -0,0 +1,39 @@
+package de.tims.player_management;
+
+public class Player {
+
+	private int points;
+	
+	public Player(int points) {
+		this.points = points;
+	}
+
+	public void addPoints(int pointsToAdd) {
+		this.points = (this.points + pointsToAdd > 0) ? this.points + pointsToAdd : 0;
+	}
+
+	public int getPoints() {
+		return this.points;
+	}
+	
+	@Override
+	public boolean equals(Object o) {
+		if (o == this) {
+			return true;
+		}
+		
+		if ((o == null) || this.getClass() != o.getClass()) {
+			return false;
+		}
+		
+		Player player2 = (Player) o;
+		
+		return this.points == player2.points;
+	}
+	
+	@Override 
+	public int hashCode() {
+		return points;
+	}
+
+}

src/main/java/de/tims/player_management/PlayerManager.java

@@ -0,0 +1,21 @@
+package de.tims.player_management;
+
+import java.util.LinkedList;
+
+public class PlayerManager {
+
+	private LinkedList<Player> players;
+
+	public LinkedList<Player> getPlayers() {
+		return players;
+	}
+
+	public void setPlayers(LinkedList<Player> players) {
+		this.players = players;
+	}
+
+	public Player selectPlayer(String playerName) {
+		return new Player(0);
+	}
+
+}

src/test/java/de/tims/player_management/PlayerManagerTest.java

@@ -0,0 +1,28 @@
+package de.tims.player_management;
+
+import static org.assertj.core.api.Assertions.*;
+
+import java.util.LinkedList;
+import java.util.stream.Stream;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+class PlayerManagerTest {
+
+	PlayerManager manager = new PlayerManager();
+	
+	@ParameterizedTest
+	@MethodSource("testCasesForSelectPlayer")
+	void selectPlayerTest(String testName, LinkedList<Player> players, String playerName, Player expectedResult) {
+		manager.setPlayers(players);
+		Player calculatedResult = manager.selectPlayer(playerName);
+		assertThat(calculatedResult).describedAs(testName).isEqualTo(expectedResult);
+	}
+	
+	private static Stream<Arguments> testCasesForSelectPlayer() {
+		return Stream.of(Arguments.of("NoPlayersYet", new LinkedList<Player>(), "Tobias", new Player(0)));
+	}
+
+}

src/test/java/de/tims/player_management/PlayerTest.java

@@ -0,0 +1,34 @@
+package de.tims.player_management;
+
+import static org.assertj.core.api.Assertions.*;
+
+import java.util.stream.Stream;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import de.tims.player_management.Player;
+
+class PlayerTest {
+	
+	Player player;
+
+	@ParameterizedTest
+	@MethodSource("testCasesForAddPoints")
+	void addPointsTest(String testName, int pointsBefore, int pointsToAdd, int expectedResult) {
+		player = new Player(pointsBefore);
+		player.addPoints(pointsToAdd);
+		int calculatedResult = player.getPoints();
+		assertThat(calculatedResult).describedAs(testName).isEqualTo(expectedResult);
+	}
+	
+	private static Stream<Arguments> testCasesForAddPoints() {
+		return Stream.of(Arguments.of("NoPointsBeforeGet0Points", 0, 0, 0),
+				Arguments.of("NoPointsBeforeGet10Points", 0, 10, 10),
+				Arguments.of("10PointsBeforeAdd10Points", 10, 10, 20),
+				Arguments.of("10PointsBeforeLose10Points", 10, -10, 0),
+				Arguments.of("LoseMorePointsThanYouHave", 10, -20, 0));
+	}
+
+}