Test Templates
Explore how to implement custom test templates in JUnit 5 by using the TestTemplate annotation and creating extensions that manage test invocation contexts. Understand how to support multiple test executions with dynamic display names and parameter resolution through practical examples.
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We discussed repeated tests and parameterized tests in previous chapters. Methods annotated with @RepeatedTest and @ParameterizedTest aren’t the actual executed tests, but templates for other tests. JUnit 5 has a specific annotation, org.junit.jupiter.api.TestTemplate, that makes a test method a test template.
Creating test templates
To create test templates, we need to create custom extensions that implement the TestTemplateInvocationContextProvider interface. This interface has two methods:
- The
boolean supportsTestTemplate(ExtensionContext context)method checks if