Add: Readme for test suite

Author: bgn-dev

client/src/__tests__/README.md

@@ -0,0 +1,49 @@
+# Test Suite
+
+## Structure
+
+```
+__tests__/
+├── unit/           # Unit tests
+│   ├── crdt/       # CRDT functionality
+│   └── webrtc/     # WebRTC manager
+├── integration/    # Integration tests
+└── utils/          # Test utilities and mocks
+```
+
+## Running Tests
+
+```bash
+# Run all tests
+npm test
+
+# Run specific test file
+npm test <filename>
+
+# Run without watch mode
+npm test -- --watchAll=false
+
+# Run with coverage
+npm test -- --coverage
+```
+
+## Test Coverage
+
+### Unit Tests - CRDT (`unit/crdt/`)
+- **crdt-basic-operations.test.js** - Core CRDT functionality (initialization, insertions, deletions)
+- **crdt-concurrent-operations.test.js** - Multi-user concurrent editing scenarios
+- **crdt-text-operations.test.js** - Text-level abstractions
+- **crdt-serialization.test.js** - Document persistence and serialization
+- **crdt-deterministic-order.test.js** - Conflict resolution
+- **crdt-convergence.test.js** - Eventual consistency
+- **crdt-validation.test.js** - Input validation and error handling
+- **crdt-fixes.test.js** - Specific bug fixes and edge cases
+
+### Unit Tests - WebRTC (`unit/webrtc/`)
+- **webrtc-manager.test.js** - WebRTC connection management
+
+### Integration Tests (`integration/`)
+- **crdt-webrtc.test.js** - Real-time collaborative editing with WebRTC
+
+### Test Utilities (`utils/`)
+- **webrtc-mocks.mjs** - Mock WebRTC and Socket.IO implementations