minor #16428 asset test coverage (eventhorizonpl)

This PR was submitted for the 2.8 branch but it was merged into the 2.7 branch instead (closes #16428).

Discussion
----------

asset test coverage

Hi,

This PR adds 100% tests code coverage for Asset component.

Best regards,
Michal

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT

Commits
-------

5a6c1f2 asset test coverage

src/Symfony/Component/Asset/Tests/Context/NullContextTest.php

@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Asset\Tests\Context;
+
+use Symfony\Component\Asset\Context\NullContext;
+
+class NullContextTest extends \PHPUnit_Framework_TestCase
+{
+    public function testGetBasePath()
+    {
+        $nullContext = new NullContext();
+
+        $this->assertEmpty($nullContext->getBasePath());
+    }
+
+    public function testIsSecure()
+    {
+        $nullContext = new NullContext();
+
+        $this->assertFalse($nullContext->isSecure());
+    }
+}

src/Symfony/Component/Asset/Tests/Context/RequestStackContextTest.php

@@ -0,0 +1,63 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Asset\Tests\Context;
+
+use Symfony\Component\Asset\Context\RequestStackContext;
+
+class RequestStackContextTest extends \PHPUnit_Framework_TestCase
+{
+    public function testGetBasePathEmpty()
+    {
+        $requestStack = $this->getMock('Symfony\Component\HttpFoundation\RequestStack');
+        $requestStackContext = new RequestStackContext($requestStack);
+
+        $this->assertEmpty($requestStackContext->getBasePath());
+    }
+
+    public function testGetBasePathSet()
+    {
+        $testBasePath = 'test-path';
+
+        $request = $this->getMock('Symfony\Component\HttpFoundation\Request');
+        $request->method('getBasePath')
+            ->willReturn($testBasePath);
+        $requestStack = $this->getMock('Symfony\Component\HttpFoundation\RequestStack');
+        $requestStack->method('getMasterRequest')
+            ->willReturn($request);
+
+        $requestStackContext = new RequestStackContext($requestStack);
+
+        $this->assertEquals($testBasePath, $requestStackContext->getBasePath());
+    }
+
+    public function testIsSecureFalse()
+    {
+        $requestStack = $this->getMock('Symfony\Component\HttpFoundation\RequestStack');
+        $requestStackContext = new RequestStackContext($requestStack);
+
+        $this->assertFalse($requestStackContext->isSecure());
+    }
+
+    public function testIsSecureTrue()
+    {
+        $request = $this->getMock('Symfony\Component\HttpFoundation\Request');
+        $request->method('isSecure')
+            ->willReturn(true);
+        $requestStack = $this->getMock('Symfony\Component\HttpFoundation\RequestStack');
+        $requestStack->method('getMasterRequest')
+            ->willReturn($request);
+
+        $requestStackContext = new RequestStackContext($requestStack);
+
+        $this->assertTrue($requestStackContext->isSecure());
+    }
+}

src/Symfony/Component/Asset/Tests/VersionStrategy/EmptyVersionStrategyTest.php

@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Asset\Tests\VersionStrategy;
+
+use Symfony\Component\Asset\VersionStrategy\EmptyVersionStrategy;
+
+class EmptyVersionStrategyTest extends \PHPUnit_Framework_TestCase
+{
+    public function testGetVersion()
+    {
+        $emptyVersionStrategy = new EmptyVersionStrategy();
+        $path = 'test-path';
+
+        $this->assertEmpty($emptyVersionStrategy->getVersion($path));
+    }
+
+    public function testApplyVersion()
+    {
+        $emptyVersionStrategy = new EmptyVersionStrategy();
+        $path = 'test-path';
+
+        $this->assertEquals($path, $emptyVersionStrategy->applyVersion($path));
+    }
+}