Json Request in Unit Test of Controller using MockMvc

Overview

Json Request in Controller test using Spring MockMvc.

Premise

--Use Spring Boot. --The model uses JSR310 (LocalDate, etc.) for the date type.

Method to be tested

@PostMapping(value = "hoge", consumes = MediaType.APPLICATION_JSON_VALUE)
public void hoge(@RequestBody Hoge hoge) {
    System.out.println("hoge");
}

Add Jackson as a dependency

Jackson is used for conversion between Java and Json. Below is an example of Maven.

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
    <version>2.6.1</version>
</dependency>

Json's request in Unit test

Below is an example from Spock.

def "Json Post request"() {
    setup:
    //Convert objects to Json format in Jackson
    def hoge = new Hoge();
    ObjectMapper mapper = new ObjectMapper();
    String json = mapper.writeValueAsString(hoge);

    expect:
    mockMvc.perform(MockMvcRequestBuilders
        .post('/hoge')
        //Content Type setting
        .contentType(MediaType.APPLICATION_JSON)
        //Json settings
        .content(json)
    ).andExpect(
        MockMvcResultMatchers.status().is(HttpStatus.OK.value()),
    )
}

reference

• Testing Spring's @RequestBody using Spring MockMVC -Jackson usage memo