diff --git a/tests/Core/Controller/JsControllerTest.php b/tests/Core/Controller/JsControllerTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..febb785f60d82bbba13b4ede4522967949c85083
--- /dev/null
+++ b/tests/Core/Controller/JsControllerTest.php
@@ -0,0 +1,110 @@
+<?php
+/**
+ * @copyright 2017, Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace Tests\Core\Controller;
+
+use OC\Core\Controller\JsController;
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\FileDisplayResponse;
+use OCP\AppFramework\Http\NotFoundResponse;
+use OCP\AppFramework\Utility\ITimeFactory;
+use OCP\Files\IAppData;
+use OCP\Files\NotFoundException;
+use OCP\Files\SimpleFS\ISimpleFile;
+use OCP\Files\SimpleFS\ISimpleFolder;
+use OCP\IRequest;
+use Test\TestCase;
+
+class JsControllerTest extends TestCase {
+
+	/** @var IAppData|\PHPUnit_Framework_MockObject_MockObject */
+	private $appData;
+
+	/** @var JsController */
+	private $controller;
+
+	public function setUp() {
+		parent::setUp();
+
+		$this->appData = $this->createMock(IAppData::class);
+
+		$timeFactory = $this->createMock(ITimeFactory::class);
+		$timeFactory->method('getTime')
+			->willReturn(1337);
+
+		$this->controller = new JsController(
+			'core',
+			$this->createMock(IRequest::class),
+			$this->appData,
+			$timeFactory
+		);
+	}
+
+	public function testNoCssFolderForApp() {
+		$this->appData->method('getFolder')
+			->with('myapp')
+			->willThrowException(new NotFoundException());
+
+		$result = $this->controller->getJs('file.css', 'myapp');
+
+		$this->assertInstanceOf(NotFoundResponse::class, $result);
+	}
+
+
+	public function testNoCssFile() {
+		$folder = $this->createMock(ISimpleFolder::class);
+		$this->appData->method('getFolder')
+			->with('myapp')
+			->willReturn($folder);
+
+		$folder->method('getFile')
+			->willThrowException(new NotFoundException());
+
+		$result = $this->controller->getJs('file.css', 'myapp');
+
+		$this->assertInstanceOf(NotFoundResponse::class, $result);
+	}
+
+	public function testGetFile() {
+		$folder = $this->createMock(ISimpleFolder::class);
+		$file = $this->createMock(ISimpleFile::class);
+		$this->appData->method('getFolder')
+			->with('myapp')
+			->willReturn($folder);
+
+		$folder->method('getFile')
+			->with('file.js')
+			->willReturn($file);
+
+		$expected = new FileDisplayResponse($file, Http::STATUS_OK, ['Content-Type' => 'application/javascript']);
+		$expected->cacheFor(86400);
+		$expires = new \DateTime();
+		$expires->setTimestamp(1337);
+		$expires->add(new \DateInterval('PT24H'));
+		$expected->addHeader('Expires', $expires->format(\DateTime::RFC1123));
+		$expected->addHeader('Pragma', 'cache');
+
+		$result = $this->controller->getJs('file.js', 'myapp');
+		$this->assertEquals($expected, $result);
+	}
+
+}
diff --git a/tests/lib/Template/JSCombinerTest.php b/tests/lib/Template/JSCombinerTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..6e4ef5735dc71404d22a95b264fb7a667b83af20
--- /dev/null
+++ b/tests/lib/Template/JSCombinerTest.php
@@ -0,0 +1,268 @@
+<?php
+
+namespace Test\Template;
+
+use OC\SystemConfig;
+use OC\Template\JSCombiner;
+use OC\Template\SCSSCacher;
+use OCP\Files\IAppData;
+use OCP\Files\NotFoundException;
+use OCP\Files\SimpleFS\ISimpleFile;
+use OCP\Files\SimpleFS\ISimpleFolder;
+use OCP\ICache;
+use OCP\IConfig;
+use OCP\ILogger;
+use OCP\IURLGenerator;
+
+class JSCombinerTest extends \Test\TestCase {
+	/** @var IAppData|\PHPUnit_Framework_MockObject_MockObject */
+	protected $appData;
+	/** @var IURLGenerator|\PHPUnit_Framework_MockObject_MockObject */
+	protected $urlGenerator;
+	/** @var IConfig|\PHPUnit_Framework_MockObject_MockObject */
+	protected $config;
+	/** @var JSCombiner */
+	protected $jsCombiner;
+	/** @var ICache|\PHPUnit_Framework_MockObject_MockObject */
+	protected $depsCache;
+
+	protected function setUp() {
+		parent::setUp();
+
+		$this->appData = $this->createMock(IAppData::class);
+		$this->urlGenerator = $this->createMock(IURLGenerator::class);
+		$this->config = $this->createMock(SystemConfig::class);
+		$this->depsCache = $this->createMock(ICache::class);
+		$this->jsCombiner = new JSCombiner(
+			$this->appData,
+			$this->urlGenerator,
+			$this->depsCache,
+			$this->config);
+	}
+
+	public function testProcessUncachedFileNoAppDataFolder() {
+		$folder = $this->createMock(ISimpleFolder::class);
+		$this->appData->expects($this->once())->method('getFolder')->with('awesomeapp')->willThrowException(new NotFoundException());
+		$this->appData->expects($this->once())->method('newFolder')->with('awesomeapp')->willReturn($folder);
+		$file = $this->createMock(ISimpleFile::class);
+
+		$fileDeps = $this->createMock(ISimpleFile::class);
+
+		$folder->method('getFile')
+			->will($this->returnCallback(function($path) use ($file) {
+				if ($path === 'combine.js') {
+					return $file;
+				} else if ($path === 'combine.js.deps') {
+					throw new NotFoundException();
+				} else {
+					$this->fail();
+				}
+			}));
+		$folder->expects($this->once())
+			->method('newFile')
+			->with('combine.js.deps')
+			->willReturn($fileDeps);
+
+		$actual = $this->jsCombiner->process(__DIR__, '/data/combine.json', 'awesomeapp');
+		$this->assertTrue($actual);
+	}
+
+	public function testProcessUncachedFile() {
+		$folder = $this->createMock(ISimpleFolder::class);
+		$this->appData->expects($this->once())->method('getFolder')->with('awesomeapp')->willReturn($folder);
+		$file = $this->createMock(ISimpleFile::class);
+
+		$fileDeps = $this->createMock(ISimpleFile::class);
+
+		$folder->method('getFile')
+			->will($this->returnCallback(function($path) use ($file) {
+				if ($path === 'combine.js') {
+					return $file;
+				} else if ($path === 'combine.js.deps') {
+					throw new NotFoundException();
+				} else {
+					$this->fail();
+				}
+			}));
+		$folder->expects($this->once())
+			->method('newFile')
+			->with('combine.js.deps')
+			->willReturn($fileDeps);
+
+		$actual = $this->jsCombiner->process(__DIR__, '/data/combine.json', 'awesomeapp');
+		$this->assertTrue($actual);
+	}
+
+	public function testProcessCachedFile() {
+		$folder = $this->createMock(ISimpleFolder::class);
+		$this->appData->expects($this->once())->method('getFolder')->with('awesomeapp')->willReturn($folder);
+		$file = $this->createMock(ISimpleFile::class);
+
+		$fileDeps = $this->createMock(ISimpleFile::class);
+
+		$fileDeps->expects($this->once())->method('getContent')->willReturn('{}');
+
+		$folder->method('getFile')
+			->will($this->returnCallback(function($path) use ($file, $fileDeps) {
+				if ($path === 'combine.js') {
+					return $file;
+				} else if ($path === 'combine.js.deps') {
+					return $fileDeps;
+				} else {
+					$this->fail();
+				}
+			}));
+
+		$actual = $this->jsCombiner->process(__DIR__, '/data/combine.json', 'awesomeapp');
+		$this->assertTrue($actual);
+	}
+
+	public function testProcessCachedFileMemcache() {
+		$folder = $this->createMock(ISimpleFolder::class);
+		$this->appData->expects($this->once())
+			->method('getFolder')
+			->with('awesomeapp')
+			->willReturn($folder);
+		$folder->method('getName')
+			->willReturn('awesomeapp');
+
+		$file = $this->createMock(ISimpleFile::class);
+
+		$this->depsCache->method('get')
+			->with('awesomeapp-combine.js.deps')
+			->willReturn('{}');
+
+		$folder->method('getFile')
+			->will($this->returnCallback(function($path) use ($file) {
+				if ($path === 'combine.js') {
+					return $file;
+				} else if ($path === 'combine.js.deps') {
+					$this->fail();
+				} else {
+					$this->fail();
+				}
+			}));
+
+		$actual = $this->jsCombiner->process(__DIR__, '/data/combine.json', 'awesomeapp');
+		$this->assertTrue($actual);
+	}
+
+	public function testIsCachedNoDepsFile() {
+		$fileName = "combine.json";
+		$folder = $this->createMock(ISimpleFolder::class);
+		$file = $this->createMock(ISimpleFile::class);
+
+		$folder->method('getFile')
+			->will($this->returnCallback(function($path) use ($file) {
+				if ($path === 'combine.js') {
+					return $file;
+				} else if ($path === 'combine.js.deps') {
+					throw new NotFoundException();
+				} else {
+					$this->fail();
+				}
+			}));
+
+		$actual = self::invokePrivate($this->jsCombiner, 'isCached', [$fileName, $folder]);
+		$this->assertFalse($actual);
+	}
+	public function testCacheNoFile() {
+		$fileName = "combine.js";
+
+		$folder = $this->createMock(ISimpleFolder::class);
+		$file = $this->createMock(ISimpleFile::class);
+		$depsFile = $this->createMock(ISimpleFile::class);
+
+		$path = __DIR__ . '/data/';
+
+		$folder->expects($this->at(0))->method('getFile')->with($fileName)->willThrowException(new NotFoundException());
+		$folder->expects($this->at(1))->method('newFile')->with($fileName)->willReturn($file);
+		$folder->expects($this->at(2))->method('getFile')->with($fileName . '.deps')->willThrowException(new NotFoundException());
+		$folder->expects($this->at(3))->method('newFile')->with($fileName . '.deps')->willReturn($depsFile);
+
+		$file->expects($this->once())->method('putContent');
+		$depsFile->expects($this->once())->method('putContent');
+
+		$actual = self::invokePrivate($this->jsCombiner, 'cache', [$path, 'combine.json', $folder]);
+		$this->assertTrue($actual);
+	}
+
+	public function testCache() {
+		$fileName = "combine.js";
+
+		$folder = $this->createMock(ISimpleFolder::class);
+		$file = $this->createMock(ISimpleFile::class);
+		$depsFile = $this->createMock(ISimpleFile::class);
+
+		$path = __DIR__ . '/data/';
+
+		$folder->expects($this->at(0))->method('getFile')->with($fileName)->willReturn($file);
+		$folder->expects($this->at(1))->method('getFile')->with($fileName . '.deps')->willReturn($depsFile);
+
+		$file->expects($this->once())->method('putContent');
+		$depsFile->expects($this->once())->method('putContent');
+
+		$actual = self::invokePrivate($this->jsCombiner, 'cache', [$path, 'combine.json', $folder]);
+		$this->assertTrue($actual);
+	}
+
+	public function testCacheSuccess() {
+		$fileName = 'combine.js';
+
+		$folder = $this->createMock(ISimpleFolder::class);
+		$file = $this->createMock(ISimpleFile::class);
+		$depsFile = $this->createMock(ISimpleFile::class);
+
+		$path = __DIR__ . '/data/';
+
+		$folder->expects($this->at(0))->method('getFile')->with($fileName)->willReturn($file);
+		$folder->expects($this->at(1))->method('getFile')->with($fileName . '.deps')->willReturn($depsFile);
+
+		$file->expects($this->at(0))
+			->method('putContent')
+			->with('var a = \'hello\';
+
+
+var b = \'world\';
+
+
+');
+		$depsFile->expects($this->at(0))->method('putContent')->with($this->callback(
+			function ($content) {
+				$deps = json_decode($content, true);
+				return array_key_exists(__DIR__ . '/data//1.js', $deps)
+					&& array_key_exists(__DIR__ . '/data//2.js', $deps);
+			}));
+
+		$actual = self::invokePrivate($this->jsCombiner, 'cache', [$path, 'combine.json', $folder]);
+		$this->assertTrue($actual);
+	}
+
+	public function dataGetCachedSCSS() {
+		return [
+			['awesomeapp', 'core/js/foo.json', '/js/core/foo.js'],
+			['files', 'apps/files/js/foo.json', '/js/files/foo.js']
+		];
+	}
+
+	/**
+	 * @param $appName
+	 * @param $fileName
+	 * @param $result
+	 * @dataProvider dataGetCachedSCSS
+	 */
+	public function testGetCachedSCSS($appName, $fileName, $result) {
+		$this->urlGenerator->expects($this->once())
+			->method('linkToRoute')
+			->with('core.Js.getJs', [
+				'fileName' => 'foo.js',
+				'appName' => $appName
+			])
+			->willReturn(\OC::$WEBROOT . $result);
+
+		$actual = $this->jsCombiner->getCachedJS($appName, $fileName);
+		$this->assertEquals(substr($result, 1), $actual);
+	}
+
+
+}
diff --git a/tests/lib/Template/data/1.js b/tests/lib/Template/data/1.js
new file mode 100644
index 0000000000000000000000000000000000000000..ab3d260180e6d4b98fa98ccb198af8529f913efa
--- /dev/null
+++ b/tests/lib/Template/data/1.js
@@ -0,0 +1 @@
+var a = 'hello';
diff --git a/tests/lib/Template/data/2.js b/tests/lib/Template/data/2.js
new file mode 100644
index 0000000000000000000000000000000000000000..4fd3078d7ab1ef9e4dc094d1e87572e58cfe3315
--- /dev/null
+++ b/tests/lib/Template/data/2.js
@@ -0,0 +1 @@
+var b = 'world';
diff --git a/tests/lib/Template/data/combine.json b/tests/lib/Template/data/combine.json
new file mode 100644
index 0000000000000000000000000000000000000000..e727cbdba8d85bca5d1ed2c1f6b1ed57c590c47b
--- /dev/null
+++ b/tests/lib/Template/data/combine.json
@@ -0,0 +1,4 @@
+[
+  "1.js",
+  "2.js"
+]