[Spring] Controller exception output test

Tests for controllers that accept requests are often written using MockMvc. If you want to output an exception, you can implement a test of the exception output with ʻorg.assertj.core.api.Assertions.assertThatThrownBy`.


Product code

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

public class TestController {

    @GetMapping(value = "exception")
    public void throwException() {
        throw new IllegalStateException("Exception");

Test code

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.servlet.MockMvc;

import static org.assertj.core.api.Assertions.assertThatThrownBy;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;

public class TestControllerTest {

    private MockMvc mockMvc;

    public void throwExceptionTest() {
        assertThatThrownBy(() ->
        ).hasCause(new IllegalStateException("Exception"));

You can use .hasCause to verify the contents of the exception.


[assertThatThrownBy (Reference)](https://joel-costigliola.github.io/assertj/core-8/api/org/assertj/core/api/Assertions.html#assertThatThrownBy-org.assertj.core.api.ThrowableAssert .ThrowingCallable-) How to prevent NestedServletException when testing Spring endpoints?(stack overflow)

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