src/test/java/de/towerdefence/server/IntegrationTest.java

@@ -1,6 +1,8 @@
 package de.towerdefence.server;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
+import de.towerdefence.server.player.PlayerRepository;
+import de.towerdefence.server.player.PlayerService;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -20,15 +22,17 @@ public abstract class IntegrationTest {
     protected MockMvc mvc;
     @Autowired
     protected ObjectMapper objectMapper;
+    @Autowired
+    protected PlayerRepository playerRepository;
     
     @BeforeEach
     void setUp() {
-        //repository.deleteAll();
+        playerRepository.deleteAll();
     }
 
     @AfterEach
     void cleanUp() {
-       //repository.deleteAll();
+        playerRepository.deleteAll();
     }
 
    }

src/test/java/de/towerdefence/server/server/PlayerRegistrationTest.java

@@ -0,0 +1,35 @@
+package de.towerdefence.server.server;
+
+import de.towerdefence.server.IntegrationTest;
+import de.towerdefence.server.oas.models.PlayerRegistrationData;
+import org.junit.jupiter.api.Test;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.RequestBuilder;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+public class PlayerRegistrationTest extends IntegrationTest {
+
+    @Test
+    void playerUsernameIsUnique() throws Exception {
+        PlayerRegistrationData body = new PlayerRegistrationData();
+        body.setUsername("test");
+        body.setPassword("password");
+
+        this.mvc
+                .perform(getRequest(body))
+                .andExpect(status().isCreated());
+        this.mvc
+                .perform(getRequest(body))
+                .andExpect(status().isConflict());
+    }
+
+    private RequestBuilder getRequest(PlayerRegistrationData playerRegistrationData) throws Exception {
+        return MockMvcRequestBuilders
+                .post(baseUri + "/player/register")
+                .content(this.objectMapper.writeValueAsString(playerRegistrationData))
+                .contentType(MediaType.APPLICATION_JSON);
+    }
+
+
+}