add Nailgun based ClosureCompiler

tests/MinifyNailgunClosureCompilerTest.php

@@ -0,0 +1,49 @@
+<?php
+
+class MinifyNailgunClosureCompilerTest extends TestCase
+{
+    public static function setupBeforeClass()
+    {
+        parent::setupBeforeClass();
+        Minify_ClosureCompiler::$isDebug = true;
+
+        // To test more functionality, download a compiler.jar from
+        // https://github.com/google/closure-compiler#getting-started,
+        // put it under tests dir as 'compiler.jar'
+
+        // set minimum necessary settings
+        Minify_ClosureCompiler::$jarFile = __DIR__ . DIRECTORY_SEPARATOR . 'compiler.jar';
+        Minify_ClosureCompiler::$tempDir = sys_get_temp_dir();
+        Minify_NailgunClosureCompiler::$ngJarFile = __DIR__ . DIRECTORY_SEPARATOR . 'nailgun.jar';
+    }
+
+    /**
+     * Test minimisation with the minimum necessary settings
+     */
+    public function test2()
+    {
+        $this->assertHasJar();
+        $src = "
+    (function (window, undefined){
+        function addOne(input) {
+            return 1 + input;
+        }
+        window.addOne = addOne;
+        window.undefined = undefined;
+    })(window);
+        ";
+        $minExpected = "(function(a,b){a.addOne=function(a){return 1+a};a.undefined=b})(window);";
+        $minOutput = Minify_NailgunClosureCompiler::minify($src);
+        $this->assertSame($minExpected, $minOutput, 'minimum necessary settings');
+    }
+
+    protected function assertHasJar()
+    {
+        $this->assertNotEmpty(Minify_ClosureCompiler::$jarFile);
+        try {
+            $this->assertFileExists(Minify_ClosureCompiler::$jarFile, "Have closure compiler compiler.jar");
+        } catch (Exception $e) {
+            $this->markTestSkipped($e->getMessage());
+        }
+    }
+}