Add comprehensive Home Assistant WebSocket and API tests

- Created detailed test suite for Home Assistant WebSocket client
- Implemented tests for WebSocket connection, authentication, and error handling
- Added comprehensive test coverage for HassInstanceImpl API methods
- Mocked WebSocket and fetch to simulate various connection scenarios
- Covered authentication, state retrieval, service calls, and environment configuration
- Improved test infrastructure for Home Assistant integration

jest-resolver.cjs

@@ -6,15 +6,28 @@ module.exports = (request, options) => {
         return path.resolve(__dirname, 'node_modules', request.replace('#', ''));
     }
 
+    // Handle .js extensions for TypeScript files
+    if (request.endsWith('.js')) {
+        const tsRequest = request.replace(/\.js$/, '.ts');
+        try {
+            return options.defaultResolver(tsRequest, options);
+        } catch (e) {
+            // If the .ts file doesn't exist, continue with the original request
+        }
+    }
+
     // Call the default resolver
     return options.defaultResolver(request, {
         ...options,
-        // Force node to resolve modules as CommonJS
+        // Handle ESM modules
         packageFilter: pkg => {
-            if (pkg.type === 'module') {
-                pkg.type = 'commonjs';
-                if (pkg.exports && pkg.exports.import) {
+            // Preserve ESM modules
+            if (pkg.type === 'module' && pkg.exports) {
+                // If there's a specific export for the current conditions, use that
+                if (pkg.exports.import) {
                     pkg.main = pkg.exports.import;
+                } else if (typeof pkg.exports === 'string') {
+                    pkg.main = pkg.exports;
                 }
             }
             return pkg;