Tests: Add support for running unit tests via grunt with karma

- Update QUnit to 1.23.1
- Remove unused dl#dl from test/index.html
- Remove unused map#imgmap from test/index.html
- Ensure all urls to data use baseURI
- Add the 'grunt karma:main' task
  - customContextFile & customDebugFile
- Add 'npm run jenkins' script

Close gh-3744
Fixes gh-1999

.travis.yml

@@ -5,3 +5,5 @@ node_js:
- "6"
- "8"
- "9"
addons:
  chrome: stable

Gruntfile.js

@@ -147,6 +147,88 @@ module.exports = function( grunt ) {
				"tween"
			]
		},
		karma: {
			options: {
				customContextFile: "test/karma.context.html",
				customDebugFile: "test/karma.debug.html",
				frameworks: [ "qunit" ],
				middleware: [ "mockserver" ],
				plugins: [
					"karma-*",
					{
						"middleware:mockserver": [
							"factory",
							require( "./test/middleware-mockserver.js" )
						]
					}
				],
				files: [
					"test/data/jquery-1.9.1.js",
					"external/qunit-assert-step/qunit-assert-step.js",
					"external/sinon/sinon.js",
					"external/npo/npo.js",
					"external/requirejs/require.js",
					"test/data/testinit.js",

					"dist/jquery.min.js",

					// Replacement for testinit.js#loadTests()
					"test/data/testrunner.js",
					"test/unit/basic.js",
					"test/unit/core.js",
					"test/unit/callbacks.js",
					"test/unit/deferred.js",
					"test/unit/deprecated.js",
					"test/unit/support.js",
					"test/unit/data.js",
					"test/unit/queue.js",
					"test/unit/attributes.js",
					"test/unit/event.js",
					"test/unit/selector.js",
					"test/unit/traversing.js",
					"test/unit/manipulation.js",
					"test/unit/wrap.js",
					"test/unit/css.js",
					"test/unit/serialize.js",
					"test/unit/ajax.js",
					"test/unit/effects.js",
					"test/unit/offset.js",
					"test/unit/dimensions.js",
					"test/unit/animation.js",
					"test/unit/tween.js",
					"test/unit/ready.js",

					{ pattern: "dist/jquery.js", included: false, served: true },
					{ pattern: "dist/*.map", included: false, served: true },
					{ pattern: "external/qunit/qunit.css", included: false, served: true },
					{
						pattern: "test/**/*.@(js|css|jpg|html|xml)",
						included: false,
						served: true
					}
				],
				reporters: [ "dots" ],
				autoWatch: false,
				concurrency: 3,
				captureTimeout: 20 * 1000,

				// To debug tests with Karma:
				// - Run 'grunt karma:chrome' or 'grunt karma:firefox'
				//   (any karma subtask that has singleRun=false)
				// - Press "Debug" in the opened browser window.
				singleRun: false
			},
			main: {
				browsers: [ "ChromeHeadless" ],
				singleRun: true
			},
			chrome: {
				browsers: [ "Chrome" ]
			},
			firefox: {
				browsers: [ "Firefox" ]
			}
		},
		watch: {
			files: [ "<%= eslint.dev.src %>" ],
			tasks: [ "dev" ]
@@ -222,6 +304,7 @@ module.exports = function( grunt ) {
		"newer:uglify",
		"remove_map_comment",
		"dist:*",
		"qunit_fixture",
		"compare_size"
	] );

@@ -231,6 +314,7 @@ module.exports = function( grunt ) {
		"uglify",
		"remove_map_comment",
		"dist:*",
		"qunit_fixture",
		"eslint:dist",
		"test:fast",
		"compare_size"

README.md

@@ -323,20 +323,20 @@ fireNative( jQuery("#elem")[0], "click" );
### Add random number to url to stop caching ###

```js
url( "some/url.php" );
url( "some/url" );
```

Example:

```js
url("data/test.html");
url("index.html");

=> "data/test.html?10538358428943"
=> "data/index.html?10538358428943"


url("data/test.php?foo=bar");
url("mock.php?foo=bar");

=> "data/test.php?foo=bar&10538358345554"
=> "data/mock.php?foo=bar&10538358345554"
```

build/tasks/qunit_fixture.js

@@ -0,0 +1,22 @@
var fs = require( "fs" );

module.exports = function( grunt ) {
	grunt.registerTask( "qunit_fixture", function() {
		var dest = "./test/data/qunit-fixture.js";
		fs.writeFileSync(
			dest,
			"// Generated by build/tasks/qunit_fixture.js\n" +
			"QUnit.config.fixture = " +
			JSON.stringify(
				fs.readFileSync(
					"./test/data/qunit-fixture.html",
					"utf8"
				).toString()
			) +
			";\n" +
			"// Compat with QUnit 1.x:\n" +
			"document.getElementById( \"qunit-fixture\" ).innerHTML = QUnit.config.fixture;\n"
		);
		grunt.log.ok( "Updated " + dest + "." );
	} );
};

external/qunit/qunit.css

@@ -1,12 +1,12 @@
/*!
 * QUnit 1.20.0
 * http://qunitjs.com/
 * QUnit 1.23.1
 * https://qunitjs.com/
 *
 * Copyright jQuery Foundation and other contributors
 * Released under the MIT license
 * http://jquery.org/license
 * https://jquery.org/license
 *
 * Date: 2015-10-27T17:53Z
 * Date: 2016-04-12T17:29Z
 */

/** Font Family and Sizes */
@@ -120,6 +120,10 @@
	display: list-item;
}

#qunit-tests.hidepass {
	position: relative;
}

#qunit-tests.hidepass li.running,
#qunit-tests.hidepass li.pass {
	visibility: hidden;