Reduce Code duplication in tests and make tests easier to read

[bitxon]

Description

In every test method we have duplicated code block

final HttpClient client = HttpClient.newBuilder().build();
final HttpRequest request = HttpRequest.newBuilder()
    .uri(URI.create(wiremockServer.getUrl("/json-body-transformer")))
    .timeout(Duration.ofSeconds(10))
    .header("Content-Type", "application/json")
    .POST(HttpRequest.BodyPublishers.ofString("{\"name\":\"John Doe\"}")).build();

This code block and similar once were extracted into testsupport utility class TestHttpClient
Result test you can see bellow:

// given
String url = wiremockServer.getUrl("/json-body-transformer");
String body = "{\"name\":\"John Doe\"}";

// when
HttpResponse<String> response = TestHttpClient.newInstance().post(url, body);

// then
assertThat(response.body())
        .as("Wrong response body")
        .contains("Hello, John Doe!");

References

N/A

Submitter checklist

• The PR request is well described and justified, including the body and the references
• The PR title represents the desired changelog entry
• The repository's code style is followed (see the contributing guide)
• Test coverage that demonstrates that the change works as expected
• For new features, there's necessary documentation in this pull request or in a subsequent PR to wiremock.org

[oleg-nenashev]

Nice! I would probably just use org.wiremock.integrations.testcontainers.test.util but fine with the current package too. Thanks!