Writing a unit test for the Hello World API returning a string

We would like to write a unit test for the hello world API, http://localhost:8080/welcome, which returns "Hello World".

In the unit test, we want to send a GET request to the resource at /welcome, and check whether the response is as expected.

The following code shows a unit test:

@Test
public void welcome() throws Exception {
    mvc.perform(
            MockMvcRequestBuilders.get("/welcome")
            .accept(MediaType.APPLICATION_JSON))
        .andExpect(status().isOk())
        .andExpect(content().string(equalTo("Hello World")));
}

Here are a few key things to note:

  • mvc.perform(MockMvcRequestBuilders.get("/welcome").accept(MediaType.APPLICATION_JSON)): Performs a request to /welcome, with the Accept header value, application/json
  • andExpect(status().isOk()): Expects that the status of the response is 200 (success)
  • andExpect(content().string(equalTo("Hello World"))): Expects that the content of the response is equal to "Hello World"
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