Build: Run tests on Travis only on browsers defined in the config

The environmental variable BROWSERS was being created but it wasn't read in the
list of browsers to pass to Karma.

Closes gh-4532

diff --git a/Gruntfile.js b/Gruntfile.js
index 7f21bf61364301ffdcbc62acf8a5a1f0f795a348..831ca4b8865566242e44579bec5f7987df30576a 100644 (file)
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -13,7 +13,9 @@ module.exports = function( grunt ) {
        }
 
        var fs = require( "fs" ),
-               gzip = require( "gzip-js" );
+               gzip = require( "gzip-js" ),
+               isTravis = process.env.TRAVIS,
+               travisBrowsers = process.env.BROWSERS && process.env.BROWSERS.split( "," );
 
        if ( !grunt.option( "filename" ) ) {
                grunt.option( "filename", "jquery.js" );
@@ -190,7 +192,7 @@ module.exports = function( grunt ) {
                                singleRun: true
                        },
                        main: {
-                               browsers: [ "ChromeHeadless", "FirefoxHeadless" ]
+                               browsers: isTravis && travisBrowsers || [ "ChromeHeadless", "FirefoxHeadless" ]
                        },
 
                        jsdom: {