Build: use different versions of jsdom for Node and iojs testing

Fixes gh-2266

build/tasks/install_jsdom.js

@@ -0,0 +1,27 @@
+module.exports = function( grunt ) {
+	grunt.registerTask( "jsdom", function() {
+		var current,
+			pkg = grunt.config( "pkg" ),
+			version = pkg.jsdomVersions[
+
+				// Unfortunately, this is currently the only
+				// way to tell the difference between Node and iojs
+				/^v0/.test( process.version ) ? "node" : "iojs"
+			];
+
+		try {
+			current = require( "jsdom/package.json" ).version;
+			if ( current === version ) {
+				return;
+			}
+		} catch ( e ) {}
+
+		// Use npm on the command-line
+		// There is no local npm
+		grunt.util.spawn( {
+			cmd: "npm",
+			args: [ "install", "jsdom@" + version ],
+			opts: { stdio: "inherit" }
+		}, this.async() );
+	});
+};

build/tasks/node_smoke_tests.js

@@ -5,7 +5,7 @@ module.exports = function( grunt ) {
 	var fs = require( "fs" ),
 		spawnTest = require( "./lib/spawn_test.js" ),
 		testsDir = "./test/node_smoke_tests/",
-		nodeSmokeTests = [];
+		nodeSmokeTests = [ "jsdom" ];
 
 	// Fire up all tests defined in test/node_smoke_tests/*.js in spawned sub-processes.
 	// All the files under test/node_smoke_tests/*.js are supposed to exit with 0 code

package.json

@@ -42,7 +42,6 @@
     "grunt-jsonlint": "1.0.4",
     "grunt-npmcopy": "0.1.0",
     "gzip-js": "0.3.2",
-    "jsdom": "3.1.2",
     "load-grunt-tasks": "1.0.0",
     "native-promise-only": "0.7.8-a",
     "promises-aplus-tests": "2.1.0",
@@ -54,6 +53,10 @@
     "testswarm": "1.1.0",
     "win-spawn": "2.0.0"
   },
+  "jsdomVersions": {
+    "node": "3.1.2",
+    "iojs": "5.3.0"
+  },
   "scripts": {
     "build": "npm install && grunt",
     "start": "grunt watch",