FooService.java

package com.makototheknight.springbootdozer;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

@Service
public class FooService {

    private final RestTemplate restTemplate;

    @Autowired
    public FooService(RestTemplate restTemplate) {
        this.restTemplate = restTemplate;
    }

    public String getResponseFromStackOverflow() {

        return restTemplate.getForObject("https://www.stackoverflow.com", String.class);

    }
}

NetworkMockTests.java

package com.makototheknight.springbootdozer;


import com.github.tomakehurst.wiremock.junit.WireMockRule;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.client.MockRestServiceServer;
import org.springframework.web.client.RestTemplate;

import static org.springframework.test.web.client.match.MockRestRequestMatchers.method;
import static org.springframework.test.web.client.match.MockRestRequestMatchers.requestTo;
import static org.springframework.test.web.client.response.MockRestResponseCreators.withSuccess;

@RunWith(SpringRunner.class)
@SpringBootTest
public class NetworkMockTests {
    @Autowired
    private FooService fooService;

    @Autowired
    private RestTemplate restTemplate;

    private MockRestServiceServer mockServer;


    @Before
    public void setup() {
        mockServer = MockRestServiceServer.createServer(restTemplate);
    }

    @Test
    public void callOutToStackOverflow() {

        mockServer.expect(requestTo("https://www.stackoverflow.com"))
                .andExpect(method(HttpMethod.GET))
        .andRespond(withSuccess("hmm", MediaType.APPLICATION_JSON));

        System.out.println(fooService.getResponseFromStackOverflow());
    }

}