Add sauce labs integration.

karma.conf-sauce.js

@@ -0,0 +1,70 @@
+/* jshint node: true */
+
+"use strict";
+
+// Browsers to run on Sauce Labs platforms.
+var sauceBrowsers = [
+  [ "chrome", "53", "Windows 10" ],
+  [ "chrome", "52", "Windows 10" ],
+  [ "firefox", "48", "Windows 10" ],
+  [ "firefox", "47", "Windows 10" ],
+  [ "microsoftedge", "13", "Windows 10" ],
+  [ "internet explorer", "11", "Windows 10" ],
+  [ "safari", "9", "OS X 10.11" ],
+  [ "safari", "8", "OS X 10.10" ]
+].reduce( function( object, platform ) {
+
+  // Convert "internet explorer" -> "ie".
+  var label = platform[ 0 ].split( " " );
+  label = (
+    label.length > 1 ? label.map( function( word ) { return word[ 0 ]; } ) : label
+  ).join( "" ) +
+  "_v" + platform[ 1 ];
+
+  object[ label ] = {
+    base: "SauceLabs",
+    browserName: platform[ 0 ],
+    version: platform[ 1 ],
+    platform: platform[ 2 ]
+  };
+  return object;
+}, {} );
+
+module.exports = function( config ) {
+  if ( !process.env.SAUCE_USERNAME || !process.env.SAUCE_ACCESS_KEY ) {
+    console.log( "Sauce environments not set --- Skipping" );
+    return process.exit( 0 );
+  }
+  config.set( {
+    basePath: "",
+    browserDisconnectTolerance: 5,
+    frameworks: [ "qunit" ],
+    singleRun: true,
+
+    // The list of files / patterns to load in the browser.
+    files: [
+      "test/bootstrap.js",
+      "js/impress.js",
+      "test/core_tests.js"
+    ],
+
+    // The number of sauce tests to start in parallel.
+    concurrency: 1,
+
+    // Test results reporter to use.
+    reporters: [ "dots", "saucelabs" ],
+    port: 9876,
+    colors: true,
+    logLevel: config.LOG_INFO,
+    sauceLabs: {
+      build: "CIRCLE-CI #" + process.env.CIRCLE_BUILD_NUM,
+      startConnect: true,
+      tunnelIdentifier: process.env.CIRCLE_BUILD_NUM
+    },
+    captureTimeout: 120000,
+    customLaunchers: sauceBrowsers,
+
+    // Browsers to launch.
+    browsers: Object.keys( sauceBrowsers )
+  } );
+};