chore: reconfigure karma for local runs

Author: divmain

packages/@lwc/integration-karma/package.json

@@ -4,7 +4,7 @@
     "version": "8.18.1",
     "scripts": {
         "start": "KARMA_MODE=watch karma start ./scripts/karma-configs/test/local.js",
-        "test": "karma start ./scripts/karma-configs/test/local.js --single-run --browsers ChromeHeadless",
+        "test": "karma start ./scripts/karma-configs/test/local.js --single-run",
         "hydration:start:engine-server": "ENGINE_SERVER=true KARMA_MODE=watch karma start ./scripts/karma-configs/hydration/local.js",
         "hydration:test:engine-server": "ENGINE_SERVER=true karma start ./scripts/karma-configs/hydration/local.js --single-run --browsers ChromeHeadless",
         "hydration:sauce:engine-server": "ENGINE_SERVER=true karma start ./scripts/karma-configs/hydration/sauce.js --single-run",
@@ -34,6 +34,7 @@
         "karma": "6.4.4",
         "karma-chrome-launcher": "^3.2.0",
         "karma-coverage": "^2.2.1",
+        "karma-firefox-launcher": "^2.1.3",
         "karma-jasmine": "^5.1.0",
         "karma-sauce-launcher-fix-firefox": "3.0.1"
     },

packages/@lwc/integration-karma/scripts/karma-configs/test/local.js

@@ -14,8 +14,8 @@ module.exports = (config) => {
     config.set({
         reporters: [...config.reporters, 'progress'],
 
-        browsers: ['Chrome'],
+        browsers: ['ChromeHeadless', 'FirefoxHeadless'],
 
-        plugins: [...config.plugins, 'karma-chrome-launcher'],
+        plugins: [...config.plugins, 'karma-chrome-launcher', 'karma-firefox-launcher'],
     });
 };

yarn.lock

@@ -1923,9 +1923,11 @@
 
 "@lwc/eslint-plugin-lwc-internal@link:./scripts/eslint-plugin":
   version "0.0.0"
+  uid ""
 
 "@lwc/test-utils-lwc-internals@link:./scripts/test-utils":
   version "0.0.0"
+  uid ""
 
 "@napi-rs/wasm-runtime@0.2.4":
   version "0.2.4"
@@ -8158,6 +8160,14 @@ karma-coverage@^2.2.1:
     istanbul-reports "^3.0.5"
     minimatch "^3.0.4"
 
+karma-firefox-launcher@^2.1.3:
+  version "2.1.3"
+  resolved "https://registry.yarnpkg.com/karma-firefox-launcher/-/karma-firefox-launcher-2.1.3.tgz#b278a4cbffa92ab81394b1a398813847b0624a85"
+  integrity sha512-LMM2bseebLbYjODBOVt7TCPP9OI2vZIXCavIXhkO9m+10Uj5l7u/SKoeRmYx8FYHTVGZSpk6peX+3BMHC1WwNw==
+  dependencies:
+    is-wsl "^2.2.0"
+    which "^3.0.0"
+
 karma-jasmine@^5.1.0:
   version "5.1.0"
   resolved "https://registry.yarnpkg.com/karma-jasmine/-/karma-jasmine-5.1.0.tgz#3af4558a6502fa16856a0f346ec2193d4b884b2f"
@@ -12624,6 +12634,13 @@ which@^2.0.1, which@^2.0.2:
   dependencies:
     isexe "^2.0.0"
 
+which@^3.0.0:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/which/-/which-3.0.1.tgz#89f1cd0c23f629a8105ffe69b8172791c87b4be1"
+  integrity sha512-XA1b62dzQzLfaEOSQFTCOd5KFf/1VSzZo7/7TUjnya6u0vGGKzU96UQBZTAThCb2j4/xjBAyii1OhRLJEivHvg==
+  dependencies:
+    isexe "^2.0.0"
+
 which@^5.0.0:
   version "5.0.0"
   resolved "https://registry.yarnpkg.com/which/-/which-5.0.0.tgz#d93f2d93f79834d4363c7d0c23e00d07c466c8d6"