feat: add test coverage scripts and GitHub Actions workflow

- Introduced new scripts in melos.yaml for running tests with coverage and combining coverage reports from all packages.
- Added a GitHub Actions workflow to automate testing on push and pull request events, including installation of dependencies and uploading coverage reports to Codecov.
- Updated README.md to include a Codecov badge for better visibility of test coverage status.

These changes enhance the testing infrastructure and improve visibility into code coverage for the Tagflow application.

.github/workflows/test.yml

@@ -0,0 +1,36 @@
+name: Test
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: "stable"
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y lcov
+          flutter pub get
+          dart pub global activate coverage
+          dart pub global activate melos
+          melos bootstrap
+
+      - name: Run tests with coverage
+        run: |
+          melos run coverage
+          melos run combine-coverage
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          file: coverage/lcov.info

README.md

@@ -16,6 +16,7 @@ Transform HTML markup into native Flutter widgets with an elegant, customizable
 
 [![pub package](https://img.shields.io/pub/v/tagflow.svg?label=tagflow&color=orange)](https://pub.dev/packages/tagflow)
 [![style: very good analysis](https://img.shields.io/badge/style-very_good_analysis-B22C89.svg)](https://pub.dev/packages/very_good_analysis)
+[![codecov](https://codecov.io/gh/devaryakjha/tagflow/branch/main/graph/badge.svg)](https://codecov.io/gh/devaryakjha/tagflow)
 
 ---
 

melos.yaml

@@ -81,4 +81,14 @@ scripts:
     run: |
       melos clean && \
       melos bootstrap
-    description: Clean and bootstrap workspace
+    description: Clean and bootstrap workspace
+
+  coverage:
+    run: melos exec -c 1 --fail-fast -- "flutter test --coverage"
+    description: Run tests with coverage and generate coverage report
+
+  combine-coverage:
+    run: |
+      mkdir -p coverage
+      lcov --add-tracefile packages/tagflow/coverage/lcov.info -o coverage/lcov.info
+    description: Combine coverage reports from all packages