Allow @Ignore on junit test classes

Currently a test class annotated with `@Ignore` will cause the test
runner to fail with

```
Exception in thread "main" java.lang.IllegalArgumentException: Top test must be a suite
	at com.google.testing.junit.runner.junit4.JUnit4TestModelBuilder.get(JUnit4TestModelBuilder.java:53)
```

This change treats classes with no tests (either no @Test annotations or
@Ignore at class level) as an empty test suite. The main motivation
behind this is allowing an entire test class to be ignored (e.g. to
quickly deal with a flaky test) without having to modify the BUILD file.
This is desirable in order to reduce the likelihood that a developer
forgets to update the BUILD file when removing the `@Ignore` annotation.

This pull request overrides the previous pull request
https://github.com/bazelbuild/bazel/pull/4073

Closes #4293.

PiperOrigin-RevId: 188850828
2 files changed
tree: 4a142000f93ad3e94c35232c9e80f46e74382f4d
  1. examples/
  2. scripts/
  3. site/
  4. src/
  5. third_party/
  6. tools/
  7. .gitattributes
  8. .gitignore
  9. AUTHORS
  10. BUILD
  11. CHANGELOG.md
  12. combine_distfiles.py
  13. combine_distfiles_to_tar.sh
  14. compile.sh
  15. CONTRIBUTING.md
  16. CONTRIBUTORS
  17. ISSUE_TEMPLATE.md
  18. LICENSE
  19. README.md
  20. WORKSPACE
README.md

Bazel

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