IndexControllerTest.java

package com.cengenes.kotlin.api.controller;

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.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.redirectedUrl;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

@RunWith(SpringRunner.class)
@SpringBootTest
@AutoConfigureMockMvc
public class IndexControllerTest {

    @Autowired
    private MockMvc mockMvc;

    @Test
    public void it_should_redirect_to_swagger_ui() throws Exception {
        //when and then
        mockMvc.perform(get("/"))
            .andDo(print())
            .andExpect(status().is3xxRedirection())
            .andExpect(redirectedUrl("/swagger-ui.html"));
    }
}