Make tests check only run when a PR is opened or reopened

[TahaTesser]

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• [x] I read the Contributor Guide and followed the process outlined there for submitting PRs.
• [x] My PR includes tests for all changed/updated/fixed behaviors.
• [ ] All existing and new tests are passing.
• [ ] I updated/added relevant documentation (doc comments with ///).
• [x] The analyzer (melos run analyze) does not report any problems on my PR.
• [x] The package compiles with the minimum Flutter version stated in the pubspec.yaml

Breaking Change

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• [ ] Yes, this is a breaking change.
• [x] No, this is not a breaking change.

[ulusoyca]

I improved your job and extended it. Now it lists the untested dart files.

jobs:
  check-for-tests:
    runs-on: ubuntu-latest
    steps:
      # Step 1: Checkout the code from the repository
      - uses: actions/checkout@v2
        with:
          fetch-depth: 0  # Fetch full history to allow full diff checking

      # Step 2: Identify changed .dart files
      - name: Identify changed .dart files
        id: identify-changes
        run: |
          # Get a list of all added or modified .dart files in the PR
          git diff --name-only --diff-filter=AM origin/master | grep '\.dart$' > changed_files.txt

          # Output the changed files for debugging
          echo "Changed .dart files:"
          cat changed_files.txt

      # Step 3: Check for corresponding test files
      - name: Check for corresponding test files
        id: check-tests
        run: |
          # Initialize an empty variable to store files without corresponding tests
          missing_tests=""

          # Loop over each changed .dart file
          while IFS= read -r file; do
            # Skip files that match ignore patterns
            if [[ $file =~ ^(lib/localization/|lib/features/self_service_training/view/manuals/|integration_test/|.*\.g\.dart|.*\.freezed\.dart)$ ]]; then
              continue
            fi

            # Check if the file is not a test file and whether it has a corresponding _test.dart file
            if [[ ! $file =~ _test\.dart$ ]]; then
              test_file="${file%.*}_test.dart"
              if ! grep -q "$test_file" changed_files.txt; then
                missing_tests="${missing_tests}${file}\n"
              fi
            fi
          done < changed_files.txt

          # Write the list of files missing tests to a file for the next step
          echo -e "$missing_tests" > missing_tests.txt

          # Output the files missing tests for debugging
          echo "Files missing tests:"
          cat missing_tests.txt

      # Step 4: Comment on the PR if tests are missing
      - name: Comment on PR if tests are missing
        uses: actions/github-script@v7.0.1
        with:
          script: |
            const fs = require('fs');
            const missingFiles = fs.readFileSync('missing_tests.txt', 'utf-8').split('\n').filter(file => file);

            console.log("Missing files (parsed):", missingFiles);

            // Base comment message indicating the lack of tests, with a friendly tone
            let body = '👋 Hi there! It looks like some files in this PR do not have corresponding tests. 🧪 We aim to maintain high test coverage to ensure code quality and prevent regressions. All changes, especially those affecting core functionality, should be accompanied by relevant tests.';

            // If there are any missing files, append them to the comment
            if (missingFiles.length > 0) {
              body += `\n\n🔍 The following files were modified without corresponding tests:\n${missingFiles.map(file => `- ${file}`).join('\n')}`;
            }

            // Log the final body message for debugging
            console.log("Final comment body:", body);

            // Post the comment on the PR
            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: body
            });

[TahaTesser]

@ulusoyca Excellent. I'll close this since it makes a very tiny change.