Add GH action to run tests

Author: vgrichina

.github/workflows/tests.yml

@@ -0,0 +1,71 @@
+name: Tests
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:  # Allow manual triggering
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        fetch-depth: 0  # Fetch all history for git-related tests
+    
+    - name: Set up environment
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y bc tap-tap
+    
+    - name: Make scripts executable
+      run: |
+        chmod +x context
+        chmod +x test/test_runner.sh
+        chmod +x test/unit/test_*.sh
+    
+    - name: Run tests
+      run: |
+        ./test/test_runner.sh
+    
+    - name: Run tests with TAP formatter (for nicer output)
+      if: always()  # Run even if the previous step failed
+      run: |
+        ./test/test_runner.sh | tap-tap
+
+  lint:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v3
+    
+    - name: Shell script linting
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y shellcheck
+        shellcheck context
+        shellcheck test/test_runner.sh
+        shellcheck test/test_utils.sh
+        shellcheck test/unit/test_*.sh
+
+  compatibility:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    
+    steps:
+    - uses: actions/checkout@v3
+    
+    - name: Make scripts executable
+      run: |
+        chmod +x context
+        chmod +x test/test_runner.sh
+        chmod +x test/unit/test_*.sh
+    
+    - name: Run tests on ${{ matrix.os }}
+      run: |
+        ./test/test_runner.sh