How do I test a Spring Boot REST API?

How do I test a Spring Boot REST API?

You can use tools like JUnit and Mockito for unit testing, and Spring's MockMvc for integration testing.

Can you show me an example of using MockMvc?

Sure! You can set up MockMvc in your test class and perform requests like this:

@Test
public void testGetUser() throws Exception {
    mockMvc.perform(get("/api/users/1"))
           .andExpect(status().isOk())
           .andExpect(jsonPath("$.name").value("John Doe"));
}

What about testing error responses?

You can test error responses by simulating invalid input and checking the status code and error message, like this:

@Test
public void testGetUserNotFound() throws Exception {
    mockMvc.perform(get("/api/users/999"))
           .andExpect(status().isNotFound());
}

Are there any best practices for testing?

Yes, keep your tests isolated, use meaningful names, and cover both positive and negative scenarios.