Create README.md

Author: do6pbln9l

tests/README.md

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+
+# Integration Tests
+
+Automated tests for OAuth2 infrastructure components.
+
+## Running Tests Locally
+
+```
+
+chmod +x tests/test_infrastructure.sh
+./tests/test_infrastructure.sh
+
+```
+
+## Test Coverage
+
+- ✅ Token storage directory (`/var/lib/hh-token`)
+- ✅ systemd timer configuration (`hh-token-refresh.timer`)
+- ✅ nginx reverse-proxy (`/etc/nginx/sites-available/hh-oauth2`)
+- ✅ Docker image availability (`ghcr.io/do6pbln9l/hh-oauth2-app`)
+
+## Expected Output
+
+```
+
+===========================================
+OAuth2 Infrastructure Integration Tests
+===========================================
+
+▶ Running: Token storage directory
+✅ PASS: Token directory exists
+
+▶ Running: systemd timer configuration
+✅ PASS: systemd timer configured
+
+▶ Running: nginx reverse-proxy
+✅ PASS: nginx config exists
+
+▶ Running: Docker image availability
+✅ PASS: Docker image found locally
+
+===========================================
+Test Results
+===========================================
+Tests run:    4
+Tests passed: 4
+Tests failed: 0
+
+✅ All tests passed!
+
+```
+
+## CI/CD Integration
+
+Tests run automatically in GitHub Actions on every push to `main` branch. In CI environment, system-specific checks are skipped.
+
+## Adding New Tests
+
+1. Create test function in `test_infrastructure.sh`
+2. Follow naming convention: `test_<component_name>`
+3. Use `test_start`, `test_pass`, `test_fail` helpers
+4. Add test call to `main()` function
+
+## Test Environment Variables
+
+- `CI=true` - Skips system-specific checks (for GitHub Actions)
+