player_management: returns player from list if existing

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

@@ -2,20 +2,26 @@ package de.tims.player_management;
 
 public class Player {
 
+	private String name;
 	private int points;
 	
-	public Player(int points) {
+	public Player(String name, int points) {
+		this.name = name;
 		this.points = points;
 	}
 
-	public void addPoints(int pointsToAdd) {
-		this.points = (this.points + pointsToAdd > 0) ? this.points + pointsToAdd : 0;
+	public String getName() {
+		return name;
 	}
 	
 	public int getPoints() {
 		return this.points;
 	}
 
+	public void addPoints(int pointsToAdd) {
+		this.points = (this.points + pointsToAdd > 0) ? this.points + pointsToAdd : 0;
+	}
+	
 	@Override
 	public boolean equals(Object o) {
 		if (o == this) {

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

@@ -1,21 +1,27 @@
 package de.tims.player_management;
 
-import java.util.LinkedList;
+import java.util.List;
 
 public class PlayerManager {
 
-	private LinkedList<Player> players;
+	private List<Player> players;
 
-	public LinkedList<Player> getPlayers() {
+	public List<Player> getPlayers() {
 		return players;
 	}
 
-	public void setPlayers(LinkedList<Player> players) {
+	public void setPlayers(List<Player> players) {
 		this.players = players;
 	}
 
 	public Player selectPlayer(String playerName) {
-		return new Player(0);
+		for (Player p : this.players) {
+			if (playerName.equals(p.getName())) {
+				return p;
+			}
+		}
+		
+		return new Player(playerName, 0);
 	}
 
 }

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

@@ -2,7 +2,7 @@ package de.tims.player_management;
 
 import static org.assertj.core.api.Assertions.*;
 
-import java.util.LinkedList;
+import java.util.List;
 import java.util.stream.Stream;
 
 import org.junit.jupiter.params.ParameterizedTest;
@@ -15,14 +15,19 @@ class PlayerManagerTest {
 	
 	@ParameterizedTest
 	@MethodSource("testCasesForSelectPlayer")
-	void selectPlayerTest(String testName, LinkedList<Player> players, String playerName, Player expectedResult) {
+	void selectPlayerTest(String testName, List<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)));
+		return Stream.of(Arguments.of("NoPlayersYetReturnNewPlayer", List.of(), 
+						"Tobias", new Player("Tobias", 0)),
+				Arguments.of("NoPlayerWithNameInListReturnNewPlayer", List.of(new Player("Steffen", 40), new Player("Lorenz", 60)),
+						"Tobias", new Player("Tobias", 0)),
+				Arguments.of("PlayerWithNameInListReturnPlayerInList",  List.of(new Player("Steffen", 40), new Player("Tobias", 50)),
+						"Tobias", new Player("Tobias", 50)));
 	}
 
 }

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

@@ -8,8 +8,6 @@ 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;
@@ -17,7 +15,7 @@ class PlayerTest {
 	@ParameterizedTest
 	@MethodSource("testCasesForAddPoints")
 	void addPointsTest(String testName, int pointsBefore, int pointsToAdd, int expectedResult) {
-		player = new Player(pointsBefore);
+		player = new Player("TestPlayer", pointsBefore);
 		player.addPoints(pointsToAdd);
 		int calculatedResult = player.getPoints();
 		assertThat(calculatedResult).describedAs(testName).isEqualTo(expectedResult);