added shouldNotCreateProjectWithSameName test

src/test/java/de/hmmh/pmt/project/CreateTest.java

@@ -41,4 +41,38 @@ public class CreateTest extends IntegrationTest {
                 .andExpect(status().isCreated())
                 .andExpect(jsonPath("$.id").exists());
     }
+
+    @Test
+    void shouldNotCreateProjectWithSameName() throws Exception {
+
+        CreateProjectDTO createDTO = new CreateProjectDTO();
+        createDTO.setName("Test");
+        createDTO.setGoal("A Test Goal");
+        createDTO.setCustomerId(10L);
+        createDTO.setAdministratorId(10L);
+        createDTO.setStart(LocalDateTime.of(2000, 1, 13, 12, 51));
+        createDTO.setPlannedEnd(LocalDateTime.of(2002, 3, 21, 11, 42));
+
+        RequestBuilder firstProjectRequestBuilder = createProjectRequestBuilder(createDTO);
+
+        this.mvc
+                .perform(firstProjectRequestBuilder)
+                .andExpect(status().isCreated())
+                .andExpect(jsonPath("$.id").exists());
+
+        RequestBuilder secondProjectRequestBuilder = createProjectRequestBuilder(createDTO);
+
+        this.mvc
+                .perform(secondProjectRequestBuilder)
+                .andExpect(status().isConflict());
+    }
+
+    private RequestBuilder createProjectRequestBuilder(CreateProjectDTO createDTO) throws Exception {
+
+        return MockMvcRequestBuilders
+                .post(baseUri + "/project")
+                .accept(MediaType.APPLICATION_JSON)
+                .content(this.objectMapper.writeValueAsString(createDTO))
+                .contentType(MediaType.APPLICATION_JSON);
+    }
 }