Spring Cloud Contract Consumer | Mock OkHttp - groovy

Question

I've my main class something like this:
class MyClass{
String bar(String inputString){
String url = "https:x.y.z/p/q"; //the URL is framed dynamically based on other class attributes
final String payloadInJson = getPayload(inputString)
final String response = doPostRequest(url, payloadInJson)
}
private static String doPostRequest(final String url, final String postData) throws IOException {
final RequestBody body = RequestBody.create(JSON, postData)
final Request request = new Request.Builder()
.url(url)
.post(body)
.build()
final Response response = createOkHttpClient().newCall(request).execute()
if (!response.isSuccessful()) {
throw new RuntimeException("...")
}
response.networkResponse().header("Location")
}
private static OkHttpClient createOkHttpClient() {
Config config = new ConfigBuilder()
.withTrustCerts(true)
.build()
def httpClient = HttpClientUtils.createHttpClient(config)
httpClient = httpClient.newBuilder().authenticator(Authenticator.NONE).build()
httpClient
}
}
and My Consumer test case is:
#SpringBootTest(classes = Application.class)
#AutoConfigureStubRunner(stubsMode = StubRunnerProperties.StubsMode.LOCAL, ids = ["com.ex:foobar:+:stubs:8090"])
class MyClassTest{
#Inject
private MyClass myClass
def 'happyPath'(){
given:
...
when:
String res = myClass.bar('lorem...')
}
}
Question is how to mock the OkHttp URL and use localhost?
Or is it that in the test case, I can refer the actual URL framed?

Answer 1

If you use Spring Cloud Contract, we start an HTTP server on a given or random port. It's enough for you to set you OK Http Client to point to the started server. Example
PSEUDOCODE:
class MyClass{
private String url = "https:x.y.z/p/q";
String bar(String inputString){
final String payloadInJson = getPayload(inputString)
final String response = doPostRequest(this.url, payloadInJson)
}
// package scope
void setUrl(String url) {
this.url = url;
}
}
and in your test you can then set the stub's port and url
THE TEST (PSEUDOCODE AGAIN):
#SpringBootTest(classes = Application.class)
#AutoConfigureStubRunner(stubsMode = StubRunnerProperties.StubsMode.LOCAL, ids = ["com.ex:foobar"])
class MyClassTest{
#Inject
private MyClass myClass
#StubRunnerPort("foobar") int stubPort;
def 'happyPath'(){
given:
myClass.url = "http://localhost:${stubPort}"
when:
String res = myClass.bar('lorem...')
}
}
a better option is to use a proper #Configuration class where you define beans and inject the URL via constructor. Anyways, hopefully, it shows you how you can approach the problem.