chore: exclude generated pigeon files from code coverage calculation, coverage badge test

Author: EchoEllet

.github/workflows/coverage-badge.yml

@@ -0,0 +1,40 @@
+name: Create coverage badge
+
+on:
+  push:
+    branches: [main]
+  # TODO(EchoEllet): For testing only, remove
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Flutter (Stable)
+        uses: subosito/flutter-action@v2
+        with:
+          channel: stable
+          cache: true
+
+      - name: Install Package Dependencies
+        run: flutter pub get
+
+      - name: Collect coverage info
+        run: flutter test --coverage
+
+      - name: Install lcov
+        run: sudo apt install -y lcov
+
+      - name: Extract coverage percentage
+        id: coverage-extractor
+        run: |
+          percentage=$(lcov --summary coverage/lcov.info | grep 'lines' | awk '{print $2}' | sed 's/%//' | sed 's/.0$//')
+          echo "COVERAGE=$percentage" >> $GITHUB_OUTPUT
+
+      - name: Print the coverage percentage for testing
+        run: |
+          echo "The coverage percentage is ${{ steps.coverage-extractor.outputs.COVERAGE }}"

lib/src/messages.g.dart

@@ -1,3 +1,4 @@
+// coverage:ignore-file
 // Autogenerated from Pigeon (v22.7.2), do not edit directly.
 // See also: https://pub.dev/packages/pigeon
 // ignore_for_file: public_member_api_docs, non_constant_identifier_names, avoid_as, unused_import, unnecessary_parenthesis, prefer_null_aware_operators, omit_local_variable_types, unused_shown_name, unnecessary_import, no_leading_underscores_for_local_identifiers

pigeons/messages.dart

@@ -6,6 +6,11 @@ import 'package:pigeon/pigeon.dart';
     dartTestOut: 'test/test_api.g.dart',
     swiftOut:
         'macos/native_image_picker_macos/Sources/native_image_picker_macos/Messages.g.swift',
+    dartOptions: DartOptions(
+      copyrightHeader: <String>[
+        'coverage:ignore-file',
+      ],
+    ),
   ),
 )
 

test/test_api.g.dart

@@ -1,3 +1,4 @@
+// coverage:ignore-file
 // Autogenerated from Pigeon (v22.7.2), do not edit directly.
 // See also: https://pub.dev/packages/pigeon
 // ignore_for_file: public_member_api_docs, non_constant_identifier_names, avoid_as, unused_import, unnecessary_parenthesis, unnecessary_import, no_leading_underscores_for_local_identifiers