How to test WireMockServer in JUnit5? - java

I am trying to write a mini-library for testing to mock common external services such as E-mail, SFTP, Buckets, HTTP APIs.
At the moment, I got stuck on WireMockServer. In WireMock docs it states that I can create both server and client to verify API calls.
I wrote the class:
public class WireMockTestServer {
private final WireMockServer server;
public WireMockTestServer(String address, MappingBuilder mappingBuilder) {
server = new WireMockServer(wireMockConfig().dynamicPort().dynamicHttpsPort());
}
public WireMockTestServer(int httpPort, int httpsPort, String address, MappingBuilder mappingBuilder) {
server = setup(
new WireMockServer(wireMockConfig().port(httpPort).httpsPort(httpsPort).bindAddress(address)),
mappingBuilder
);
}
private WireMockServer setup(WireMockServer server, MappingBuilder mappingBuilder) {
server.stubFor(mappingBuilder);
return server;
}
public void start() {
server.start();
}
public void stop() {
server.stop();
}
}
which I can path endpoint declaration and redirect my services toward it.
When I am trying to test it:
public class WireMockTestServerTest {
#Test
public void testSetup() throws Exception {
MappingBuilder mappingBuilder = get(urlEqualTo("/health"))
.willReturn(aResponse().withHeader("Content-Type", "application/json")
.withStatus(200));
WireMockTestServer server = new WireMockTestServer(8888, 9988, "127.0.0.1", mappingBuilder);
server.start();
// This line should fail
verify(getRequestedFor(urlEqualTo("/health")).withHeader("Content-Type", equalTo("text/xml")));
server.stop();
}
}
The test fails. The issue is, it fails not because of an assertion but because it starts on a wrong port 8080 which is occupied by other processes.
How can I start WireMockServer on another port and test it with JUnit 5?
I am using Java 8, Maven, Spring Boot.

As mentioned in comment static verify method tries to verify against default wiremock instance. Since you are creating a standalone instance in your test you should verify against it. Create a verify method in your WireMockTestServer :
public void verify(final RequestPatternBuilder requestPatternBuilder) {
server.verify(requestPatternBuilder);
}
and then you can verify against it :
#Test
public void testSetup() throws Exception {
MappingBuilder mappingBuilder = get(urlEqualTo("/health"))
.willReturn(aResponse().withHeader("Content-Type", "application/json")
.withStatus(200));
WireMockTestServer server = new WireMockTestServer(8888, 9988, "127.0.0.1", mappingBuilder);
server.start();
// This line should fail
server.verify(getRequestedFor(urlEqualTo("/health")).withHeader("Content-Type", equalTo("text/xml")));
server.stop();
}

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The below post is similar to your question. Hopefully it should work for you
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What we (the jetty developers) have learned about using jetty embedded servers with junit.
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This technique is used where we have dozens of test methods that access the same server, and those requests do not alter the state in the server. This speeds up the test case execution by simply not recreating the server between each test method.
Give a try to "com.jayway.restassured" for your http test. too easy to write some test :
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