MockMvc for HTTP assertions in Spring Boot - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is MockMvc in Spring Boot testing?

MockMvc is a tool in Spring Boot that lets you test your web controllers by simulating HTTP requests and responses without starting a real server.

beginner

How do you perform a GET request using MockMvc?

You use mockMvc.perform(get("/your-url")) to simulate a GET request to the specified URL.

beginner

What method do you use to check the HTTP status in MockMvc assertions?

You use andExpect(status().isOk()) to check if the HTTP response status is 200 OK.

intermediate

How can you verify the response content type with MockMvc?

Use andExpect(content().contentType("application/json")) to check if the response content type is JSON.

intermediate

Why is MockMvc useful compared to starting a full server for tests?

MockMvc runs tests faster and isolates controller logic by simulating HTTP calls without starting the full web server, making tests quicker and easier to run.

Which MockMvc method simulates an HTTP POST request?

A delete("/url")

B get("/url")

C put("/url")

D post("/url")

The post() method simulates an HTTP POST request in MockMvc.

How do you check if the response status is 404 Not Found in MockMvc?

A andExpect(status().isBadRequest())

B andExpect(status().isNotFound())

C andExpect(status().isOk())

D andExpect(status().isUnauthorized())

Use status().isNotFound() to assert a 404 HTTP status.

What does mockMvc.perform() return?

A The full HTTP request object

B The HTTP response body as a string

C A ResultActions object to chain assertions

D A boolean indicating success

mockMvc.perform() returns a ResultActions object that allows chaining assertions like status and content checks.

Which annotation is commonly used to inject MockMvc in Spring Boot tests?

A @AutoConfigureMockMvc

B @MockBean

C @SpringBootApplication

D @Controller

@AutoConfigureMockMvc sets up MockMvc for testing in Spring Boot.

How do you verify JSON content in the response using MockMvc?

A andExpect(content().json("{\"key\":\"value\"}"))

B andExpect(content().string("value"))

C andExpect(jsonPath("$.key").exists())

D andExpect(status().isJson())

Use content().json() to check if the response JSON matches the expected string.

Explain how MockMvc helps test Spring Boot controllers without starting a server.

Think about how you can test web calls without opening a browser or server.

Describe the steps to write a MockMvc test that checks a GET request returns status 200 and JSON content.

Start with performing the request, then add assertions.