Java Spring Boot Testing

Test Execution

Run tests with:

cd /workspaces/claudeplus
./gradlew backend:test                           # All tests
./gradlew backend:test --tests "*TaskControllerTest*"  # Specific test class
./gradlew backend:test --tests "*TaskControllerTest.testMethod*"  # Specific method

Testing Patterns

This project uses JUnit 5 with Mockito and Spring's @WebMvcTest:

Controller Test Structure

@WebMvcTest(TaskController.class)
class TaskControllerTest {
    @Autowired
    private MockMvc mockMvc;

    @MockBean
    private TaskService taskService;

    @Test
    void shouldReturnAllTasks() throws Exception {
        when(taskService.findAll()).thenReturn(List.of(task));

        mockMvc.perform(get("/api/tasks"))
            .andExpect(status().isOk())
            .andExpect(jsonPath("$[0].title").value("Task 1"));
    }
}

Mockito Patterns

• when(mock.method()).thenReturn(value) - Stub return values
• verify(mock).method() - Verify interactions
• @MockBean - Create Spring-managed mock
• ArgumentCaptor<T> - Capture arguments for assertions

Common Test Fixes

1. 404 Not Found: Check endpoint path matches controller mapping
2. Mock not returning: Ensure when() matches exact method signature
3. JSON parsing errors: Verify @RequestBody and content type headers
4. CORS issues: Check @CrossOrigin annotation on controller

Test Location

Tests are in: /backend/src/test/java/com/claudeplus/demo/