Future _applyPackageTestChecks()

in app_dart/lib/src/request_handlers/github_webhook.dart [379:429]
40 lines of code
23 McCabe index (conditional complexity)

  Future<void> _applyPackageTestChecks(GitHub gitHubClient, String? eventAction, PullRequest pr) async {
    final RepositorySlug slug = pr.base!.repo!.slug();
    final Stream<PullRequestFile> files = gitHubClient.pullRequests.listFiles(slug, pr.number!);
    bool hasTests = false;
    bool needsTests = false;

    await for (PullRequestFile file in files) {
      final String filename = file.filename!;

      // When null, do not assume 0 lines have been added.
      final int linesAdded = file.additionsCount ?? 1;
      final int linesDeleted = file.deletionsCount ?? 0;
      final int linesTotal = file.changesCount ?? linesDeleted + linesAdded;
      final bool addedCode = linesAdded > 0 || linesDeleted != linesTotal;

      if (addedCode &&
          !filename.endsWith('AUTHORS') &&
          !filename.endsWith('CODEOWNERS') &&
          !filename.endsWith('pubspec.yaml') &&
          !filename.endsWith('.ci.yaml') &&
          !filename.endsWith('.cirrus.yml') &&
          !filename.contains('.ci/') &&
          !filename.contains('.github/') &&
          !filename.endsWith('.md')) {
        needsTests = !_allChangesAreCodeComments(file);
      }
      // See https://github.com/flutter/flutter/wiki/Plugin-Tests for discussion
      // of various plugin test types and locations.
      if (filename.endsWith('_test.dart') ||
          // Native iOS/macOS tests.
          filename.contains('RunnerTests/') ||
          filename.contains('RunnerUITests/') ||
          // Native Android tests.
          filename.contains('android/src/test/') ||
          filename.contains('androidTest/') ||
          // Native Linux tests.
          filename.endsWith('_test.cc') ||
          // Native Windows tests.
          filename.endsWith('_test.cpp')) {
        hasTests = true;
      }
    }

    if (!hasTests && needsTests && !pr.draft!) {
      final String body = config.missingTestsPullRequestMessage;
      if (!await _alreadyCommented(gitHubClient, pr, body)) {
        await gitHubClient.issues.createComment(slug, pr.number!, body);
        await gitHubClient.issues.addLabelsToIssue(slug, pr.number!, kNeedsTestsLabels);
      }
    }
  }