From 4d1b4cb828cfa0c2bcd3e76447a51b3c1e53e369 Mon Sep 17 00:00:00 2001
From: yshepilov <buggygm@gmail.com>
Date: Sun, 12 Apr 2020 18:08:50 +0200
Subject: [PATCH] added possibility to override browsers via cli arguments

---
 index.js      | 11 ++++++++---
 karma.conf.js | 16 ++++++++++++----
 2 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/index.js b/index.js
index 0ba7d2d..3f75c59 100644
--- a/index.js
+++ b/index.js
@@ -27,11 +27,15 @@ module.exports = ( api, projectOptions ) => {
   api.registerCommand( 'test:unit', {
       description: 'Run unit tests with karma',
       usage: 'vue-cli-service test:unit [options] [...files]',
+      options: {
+        '--watch, -w': 'run in watch mode',
+        '--browsers, -b': ' A list of browsers to launch and capture'
+      }
     }, ( args ) => {
       const webpackConfig = api.resolveWebpackConfig();
 
-      process.env.VUE_CLI_BABEL_TARGET_NODE = true
-      process.env.VUE_CLI_BABEL_TRANSPILE_MODULES = true
+      process.env.VUE_CLI_BABEL_TARGET_NODE = true;
+      process.env.VUE_CLI_BABEL_TRANSPILE_MODULES = true;
 
       return new Promise( ( resolve, reject ) => {
         let KarmaServer = require( 'karma' ).Server;
@@ -41,7 +45,8 @@ module.exports = ( api, projectOptions ) => {
           generateKarmaConfig( {
             webpackConfig,
             karmaOptions,
-            watch: args.watch || args.w
+            watch: args.watch || args.w,
+            browsers: args.browsers || args.b
           } ), ( exitCode ) => {
             console.log( `Karma exited with exitCode ${exitCode}` );
 
diff --git a/karma.conf.js b/karma.conf.js
index b09b344..146ea58 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -1,7 +1,7 @@
-const karmaConstants = require('karma').constants;
-const merge = require('webpack-merge');
+const karmaConstants = require( 'karma' ).constants;
+const merge = require( 'webpack-merge' );
 
-module.exports = ( { webpackConfig, karmaOptions, watch } ) => {
+module.exports = ( { webpackConfig, karmaOptions, watch, browsers } ) => {
   delete webpackConfig.entry;
   webpackConfig = merge( webpackConfig, {
     devtool: 'inline-source-map'
@@ -13,6 +13,14 @@ module.exports = ( { webpackConfig, karmaOptions, watch } ) => {
     preprocessors[ fileNameOrPattern ] = [ 'webpack' ];
   } );
 
+  if ( browsers ) {
+    if ( (typeof browsers === 'string') || (browsers instanceof String) ) {
+      browsers = browsers.split( ',' );
+    }
+  } else {
+    browsers = karmaOptions.browsers;
+  }
+
   let karmaConfig = {
     files: karmaOptions.files,
 
@@ -24,7 +32,7 @@ module.exports = ( { webpackConfig, karmaOptions, watch } ) => {
 
     singleRun: !watch,
 
-    browsers: karmaOptions.browsers,
+    browsers: browsers,
 
     frameworks: karmaOptions.frameworks,