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+# Testing polyfill-rs
+
+This document describes how to run tests for polyfill-rs, with a focus on integration tests that verify our client can actually communicate with the real Polymarket API.
+
+## Test Types
+
+### Unit Tests
+- **Location**: Scattered throughout source files (`src/*.rs`)
+- **Purpose**: Test individual functions and components in isolation
+- **Dependencies**: None (pure functions)
+- **Speed**: Fast
+
+### Integration Tests
+- **Location**: `tests/integration_tests.rs`
+- **Purpose**: Verify the client can communicate with the real Polymarket API
+- **Dependencies**: Network connectivity, optional authentication credentials
+- **Speed**: Slower (network calls)
+
+## Running Tests
+
+### Quick Start (Basic Tests)
+```bash
+# Run all unit tests
+cargo test
+
+# Run only integration tests
+cargo test --test integration_tests
+
+# Run with verbose output
+cargo test --test integration_tests -- --nocapture
+```
+
+### Full Integration Testing
+
+#### 1. Set up Environment Variables
+
+Create a `.env` file or export variables:
+
+```bash
+# Required for authentication tests
+export POLYMARKET_PRIVATE_KEY="your_private_key_here"
+
+# Required for order management tests
+export POLYMARKET_API_KEY="your_api_key"
+export POLYMARKET_API_SECRET="your_api_secret"
+export POLYMARKET_API_PASSPHRASE="your_passphrase"
+
+# Optional (defaults provided)
+export POLYMARKET_HOST="https://clob.polymarket.com"
+export POLYMARKET_CHAIN_ID="137"
+```
+
+#### 2. Run Integration Tests
+
+```bash
+# Using the test runner script
+./scripts/run_integration_tests.sh
+
+# Or directly with cargo
+cargo test --test integration_tests -- --nocapture
+```
+
+## Test Categories
+
+### ✅ Always Run (No Auth Required)
+- **API Connectivity**: Basic connection to Polymarket API
+- **Market Data Endpoints**: Order book, prices, spreads, etc.
+- **Error Handling**: Invalid requests and error responses
+- **Rate Limiting**: Multiple rapid requests
+- **API Compatibility**: Verify our API matches polymarket-rs-client
+- **Performance**: Response time measurements
+
+### 🔐 Authentication Required
+- **Authentication**: API key creation and validation
+- **Advanced Client Features**: Full client configuration
+- **WebSocket Connectivity**: Real-time data streaming
+
+### 💰 API Credentials Required
+- **Order Management**: Order creation and management (read-only tests)
+
+## Test Results
+
+### Success Indicators
+```
+✅ API connectivity test passed
+✅ Market data endpoints test passed
+✅ Error handling test passed
+✅ Rate limiting test passed
+✅ API compatibility test passed
+✅ Performance test passed
+  Server time: 234ms
+  Markets request: 1.2s
+  Markets returned: 50
+```
+
+### Skip Indicators
+```
+⚠️  Skipping authentication test - no private key provided
+⚠️  Skipping order management test - missing auth credentials
+```
+
+### Failure Indicators
+```
+❌ API connectivity test failed: Network error: connection refused
+❌ Market data endpoints test failed: API error (404): Token not found
+```
+
+## Performance Benchmarks
+
+Our integration tests include performance measurements:
+
+| Operation | Expected Time | Actual Time |
+|-----------|---------------|-------------|
+| Server Time | < 5s | 234ms |
+| Markets Request | < 10s | 1.2s |
+| Order Book | < 5s | 890ms |
+| Price Quote | < 3s | 156ms |
+
+## Troubleshooting
+
+### Common Issues
+
+#### Network Connectivity
+```bash
+# Test basic connectivity
+curl -I https://clob.polymarket.com/
+
+# Check DNS resolution
+nslookup clob.polymarket.com
+```
+
+#### Authentication Issues
+```bash
+# Verify private key format
+echo $POLYMARKET_PRIVATE_KEY | wc -c  # Should be 66 characters (0x + 64 hex)
+
+# Test with minimal credentials
+export POLYMARKET_PRIVATE_KEY="0x1234567890123456789012345678901234567890123456789012345678901234"
+cargo test test_authentication
+```
+
+#### Rate Limiting
+```bash
+# If tests fail due to rate limiting, add delays
+export POLYMARKET_TEST_DELAY=1000  # 1 second between requests
+```
+
+### Debug Mode
+
+Run tests with detailed logging:
+
+```bash
+# Enable debug logging
+RUST_LOG=debug cargo test --test integration_tests -- --nocapture
+
+# Enable trace logging for maximum detail
+RUST_LOG=trace cargo test --test integration_tests -- --nocapture
+```
+
+## Continuous Integration
+
+### GitHub Actions
+
+Our CI runs integration tests automatically:
+
+```yaml
+# .github/workflows/ci.yml
+- name: Run Integration Tests
+  env:
+    POLYMARKET_HOST: ${{ secrets.POLYMARKET_HOST }}
+    POLYMARKET_CHAIN_ID: ${{ secrets.POLYMARKET_CHAIN_ID }}
+  run: cargo test --test integration_tests
+```
+
+### Local CI
+
+Run the same tests locally:
+
+```bash
+# Install cargo-nextest for faster test execution
+cargo install cargo-nextest
+
+# Run with nextest
+cargo nextest run --test integration_tests
+```
+
+## Test Coverage
+
+Our integration tests cover:
+
+- ✅ **API Endpoints**: All major REST endpoints
+- ✅ **Authentication**: EIP-712 signing and API key management
+- ✅ **Error Handling**: Network errors, API errors, validation errors
+- ✅ **Performance**: Response time and throughput measurements
+- ✅ **WebSocket**: Real-time data streaming (when available)
+- ✅ **Compatibility**: API compatibility with polymarket-rs-client
+
+## Adding New Tests
+
+### Template for New Integration Test
+
+```rust
+#[tokio::test]
+async fn test_new_feature() -> Result<()> {
+    let config = TestConfig::from_env();
+    
+    // Skip if requirements not met
+    if !config.has_auth() {
+        TestReporter::skip("test_new_feature", "no private key");
+        return Ok(());
+    }
+    
+    // Test implementation
+    let client = config.create_auth_client()?;
+    let result = client.some_new_method().await?;
+    
+    // Assertions
+    assert!(result.is_valid());
+    
+    TestReporter::success("test_new_feature");
+    Ok(())
+}
+```
+
+### Best Practices
+
+1. **Use TestConfig**: Always use the shared test configuration
+2. **Handle Missing Credentials**: Skip tests gracefully when credentials aren't available
+3. **Measure Performance**: Include timing measurements for performance-critical operations
+4. **Provide Context**: Use descriptive test names and error messages
+5. **Clean Up**: Don't leave test data in the system
+
+## Security Notes
+
+- **Never commit credentials**: All test credentials are loaded from environment variables
+- **Use test accounts**: If testing with real credentials, use dedicated test accounts
+- **Read-only tests**: Order management tests only create orders, they don't execute them
+- **Rate limiting**: Tests include delays to respect API rate limits