Extent your JUnit 5 tests with dependency injection enabled test methods with the help of CDI

InjectionExtension.java

public class InjectionExtension implements ParameterResolver {

  private SeContainer container;

  /**
   * boot the CDI context
   */
  public InjectionExtension() {
    container = SeContainerInitializer.newInstance().initialize();
  }

  /**
   * determines weather we can inject all the parameters specified in the test method
   */
  @Override
  public boolean supportsParameter(ParameterContext parameterContext,
      ExtensionContext extensionContext) throws ParameterResolutionException {
    Method method = (Method) parameterContext.getDeclaringExecutable();
    Class<?>[] types = method.getParameterTypes();
    return Arrays.stream(types).allMatch(type -> container.select(type).isResolvable());
  }

  /**
   * resolve the return the object to be used in the test method
   */
  @Override
  public Object resolveParameter(ParameterContext parameterContext,
      ExtensionContext extensionContext) throws ParameterResolutionException {
    int paramIndex = parameterContext.getIndex();
    Method method = (Method) parameterContext.getDeclaringExecutable();
    Parameter param = method.getParameters()[paramIndex];
    return container.select(param.getType()).get();
  }
}