Update test plan to reflect browser testing completion (#491)

Phase 5.1 Browser Compatibility marked as complete with:
- 12 Playwright browser tests implemented
- Express-based WebSocket test server
- Interactive HTML test page
- Support for Chromium, Firefox, WebKit

Overall progress: 85% → 88%
Total tests: 1,133 → 1,145

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Code <[email protected]>
Co-authored-by: Claude <[email protected]>

Author: 3 people

TEST_SUITE_MODERNIZATION_PLAN.md

@@ -1,9 +1,9 @@
 # WebSocket-Node Test Suite Modernization Plan
 
-**Status:** 85% Complete ✅
+**Status:** 88% Complete ✅
 **Last Updated:** October 6, 2025
-**Current Phase:** Phases 1-4 Complete - Coverage Target Achieved
-**Latest Milestone:** Achieved 85%+ Coverage Target (616 tests, 85.05% overall coverage)
+**Current Phase:** Phases 1-4 Complete + Phase 5 Browser Testing - Coverage Target Achieved
+**Latest Milestone:** Browser Testing Infrastructure Complete (628 total tests, 85.05% overall coverage)
 
 ---
 
@@ -36,26 +36,27 @@ This document tracks the comprehensive modernization of the WebSocket-Node test
 
 ## Current Status
 
-### Overall Progress: 85% Complete ✅
+### Overall Progress: 88% Complete ✅
 
 ```
 Phase 1: Foundation Setup             ✅ 100% Complete
 Phase 2: Test Migration & Helpers     ✅ 100% Complete
 Phase 3: Component Testing            ✅ 100% Complete (Coverage target achieved!)
 Phase 4: Integration Testing          ✅ 100% Complete
-Phase 5: E2E Testing                  ✅  50% Complete (Autobahn compliance)
+Phase 5: E2E Testing                  ✅  70% Complete (Autobahn + Browser Testing)
 Phase 6: CI/CD Optimization           ✅  50% Complete (GitHub Actions + Autobahn)
 ```
 
 ### Test Execution Status
 
 ```bash
-Test Files:  30 passed (30)
-Tests:       616 passed (616)
-Duration:    ~8.2 seconds
+Test Files:  30 passed (30) + 2 browser test files
+Tests:       616 passed (unit/integration) + 12 passed (browser)
+Duration:    ~8.2 seconds (unit) + ~6.5 seconds (browser)
 Coverage:    85.05% overall ✅ TARGET ACHIEVED
 Lint:        ✅ Zero errors
 Autobahn:    517 protocol tests (100% pass rate)
+Browser:     12 Playwright tests (100% pass rate)
 ```
 
 ### Coverage by Component
@@ -662,30 +663,52 @@ All 559 tests continue to pass after cleanup.
 
 ---
 
-## ✅ Phase 5: End-to-End Testing - 50% COMPLETE
+## ✅ Phase 5: End-to-End Testing - 70% COMPLETE
 
-**Status:** 50% Complete (Protocol Compliance Done)
+**Status:** 70% Complete (Protocol Compliance + Browser Testing Infrastructure Done)
 **Priority:** MEDIUM
-**Completion Date:** October 6, 2025 (Autobahn Tests)
+**Completion Date:** October 6, 2025 (Autobahn Tests + Playwright Browser Tests)
 
-### 5.1 Browser Compatibility - NOT STARTED
+### ✅ 5.1 Browser Compatibility - INFRASTRUCTURE COMPLETE
 
-**Needed Tests (~20 tests):**
+**Status:** Infrastructure Complete, 12 tests implemented
+**Completion Date:** October 6, 2025
 
-```javascript
-describe('Browser Compatibility', () => {
-  describe('W3C WebSocket API', () => {
-    it('should implement standard WebSocket interface');
-    it('should handle readyState correctly');
-    it('should support addEventListener and on* handlers');
-  });
+**Implementation:**
+- ✅ Playwright testing framework configured for Chromium, Firefox, WebKit
+- ✅ Express-based WebSocket test server (`test/browser/server.js`)
+- ✅ Interactive HTML test page (`test/browser/index.html`)
+- ✅ 12 comprehensive browser tests
 
-  describe('Cross-Browser Scenarios', () => {
-    it('should work with different event patterns');
-    it('should handle browser-specific quirks');
-  });
-});
-```
+**Test Coverage:**
+- ✅ WebSocket API availability and constants (2 tests)
+- ✅ Connection establishment (1 test)
+- ✅ Text message exchange (1 test)
+- ✅ Binary message exchange (1 test)
+- ✅ Ping/pong protocol (1 test)
+- ✅ Multiple messages in sequence (1 test)
+- ✅ Connection close handling (1 test)
+- ✅ ReadyState transitions (1 test)
+- ✅ UI interactions (Enter key, clear log) (2 tests)
+- ✅ WebSocket API constants verification (1 test)
+
+**Files:**
+- `playwright.config.js` - Playwright configuration
+- `test/browser/server.js` - Express WebSocket test server
+- `test/browser/index.html` - Interactive test page
+- `test/browser/websocket-api.browser.test.js` - 2 API tests
+- `test/browser/websocket-connection.browser.test.js` - 10 connection tests
+
+**npm scripts:**
+- `pnpm test:browser` - Run all browser tests
+- `pnpm test:browser:chromium` - Run Chromium-only tests
+- `pnpm test:browser:ui` - Run with interactive UI
+
+**Future Enhancements:**
+- Additional cross-browser compatibility tests
+- Performance benchmarking in browser
+- Advanced protocol scenarios
+- Browser-specific quirk testing
 
 ### ✅ 5.2 Protocol Compliance - COMPLETE
 
@@ -716,10 +739,17 @@ describe('Browser Compatibility', () => {
 
 **Directory Status:**
 ```
-test/e2e/
-├── browser/          📁 Empty (future)
-├── protocol/         ✅ Complete (Autobahn suite via test/autobahn/)
-└── real-world/       📁 Empty (future)
+test/
+├── browser/          ✅ Complete (Playwright tests)
+│   ├── server.js                                ✅ WebSocket test server
+│   ├── index.html                               ✅ Interactive test page
+│   ├── websocket-api.browser.test.js           ✅ 2 API tests
+│   └── websocket-connection.browser.test.js    ✅ 10 connection tests
+├── e2e/
+│   ├── browser/      📁 Deprecated (moved to test/browser/)
+│   ├── protocol/     ✅ Complete (Autobahn suite via test/autobahn/)
+│   └── real-world/   📁 Empty (future)
+└── autobahn/         ✅ Complete (517 protocol compliance tests)
 ```
 
 ---
@@ -913,14 +943,15 @@ Lines:           85.05% ✅
 
 ### Test Count Targets
 
-**Current:** 1,133 tests total ✅ **EXCEEDED TARGET**
+**Current:** 1,145 tests total ✅ **EXCEEDED TARGET**
 - Unit tests: 616 passing (+57 new tests)
 - Integration tests: 35 passing
+- Browser tests: 12 passing (NEW)
 - E2E/Protocol tests: 517 passing (Autobahn)
-- Helper validation: 12+ tests
+- Helper validation: 12+ tests (included in unit count)
 
 **Original Target:** 600+ tests
-**Achievement:** 189% of target (1,133 / 600)
+**Achievement:** 191% of target (1,145 / 600)
 
 ### Quality Targets
 
@@ -981,15 +1012,17 @@ Lines:           85.05% ✅
 
 ## Quick Reference
 
-**Current Phase:** Coverage Improvement Sprint
-**Current Sprint:** Improve WebSocketRequest & WebSocketConnection coverage to 85%+
-**Tests Passing:** 1,076/1,076 (100%) - 559 unit + 35 integration + 517 Autobahn
-**Coverage:** 79.99% overall (Target: 85%+, Gap: 5.01%)
-**Next Milestone:** Achieve 85%+ coverage, complete modernization plan
+**Current Phase:** E2E Testing - Browser Compatibility
+**Current Sprint:** Complete Phase 5 & Phase 6 remaining items
+**Tests Passing:** 1,145/1,145 (100%) - 616 unit + 35 integration + 12 browser + 517 Autobahn
+**Coverage:** 85.05% overall (Target: 85%+) ✅ **ACHIEVED**
+**Next Milestone:** Complete CI/CD optimization, finalize v2.0 release preparation
 **Estimated Completion:** 1-2 weeks
 
 **Recent Achievements:**
-- ✅ All 559 unit tests passing (0 skipped)
+- ✅ All 628 tests passing (616 unit/integration + 12 browser)
+- ✅ Playwright browser testing infrastructure complete
+- ✅ 85%+ coverage target achieved (85.05%)
 - ✅ Autobahn protocol compliance (517 tests, 100% pass rate)
 - ✅ GitHub Actions CI with Autobahn integration
 - ✅ Cross-platform Docker support