message: test(docs-infra): remove incorrect preview server test
  The test was introduced in but the behavior the test was
  verifying does not match the actual behavior of
  `BuildCleaner#getOpenPrNumbers()`.
  The reason that the test did not fail is that the verification happened
  asynchronously, but the test completed synchronously (by accident).
  PR Close
diff: @@ -15,7 +15,6 @@ const EXISTING_DOWNLOADS = [
  '20-1234567-build.zip',
  ];
  const OPEN_PRS = [10, 40];
  -const ANY_DATE = jasmine.any(String);
  // Tests
  describe('BuildCleaner', () => {
  @@ -269,14 +268,6 @@ describe('BuildCleaner', () => {
  prDeferred.resolve([{id: 0, number: 1}, {id: 1, number: 2}, {id: 2, number: 3}]);
  });
  -
  - it('should log the number of open PRs', () => {
  - promise.then(prNumbers => {
  - expect(loggerLogSpy).toHaveBeenCalledWith(
  - ANY_DATE, 'BuildCleaner: ', `Open pull requests: ${prNumbers}`);
  - });
  - });
  -
  });
  