I'm implementing a custom JUnit Runner and would like to add additional reporting capabilities to it. I'd also like to reuse as much existing JUnit infrastructure as possible, so implementing a RunListener sounded like a good idea. Methods of RunListener either take a Description or a Failure, both with no obvious way to add additional information about the testcases.
Description is effectively final because it has no public constructor, so overriding it is not possible. There is a private uniqueId field that could be misused via reflection but that would be really hacky.
A slightly less hacky variant might be to define annotations for all the information I need and attach implementations of this annotation to the Description. Has anyone done something like this or is there a recommended way how this could be handled?
Here is an example of what I'm currently trying:
public @interface StepMetadata {
int lineNumber();
String keyword();
String title();
}
public class StepMetadataImpl implements StepMetadata {
private final int lineNumber;
private final String keyword;
private final String title;
// constructor and accessor methods
@Override
public Class<? extends Annotation> annotationType() {
return StepMetadata.class;
}
}
// inside the Runner
Description.createTestDescription(className, stepTitle, new StepMetadataImpl(...))
// inside the RunListener
StepMetadata step = description.getAnnotation(StepMetadata.class)
Related question, are there any downsides to writing implementations of annotation interfaces?
