Add tests for MixExtension

Tests/Twig/ElixirMixExtensionTest.php

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+<?php
+
+namespace Iulyanp\ElixirMixBundle\Tests\Twig;
+
+use Iulyanp\ElixirMixBundle\Twig\MixExtension;
+
+/**
+ * Class Test
+ */
+class ElixirMixExtensionTest extends \PHPUnit_Framework_TestCase
+{
+    const WEB_DIR = __DIR__.'/stub';
+
+    /**
+     * @var
+     */
+    private $mixExtension;
+
+    /**
+     * Set UP.
+     *
+     * Instantiate ElixirExtension for all tests
+     */
+    public function setUp()
+    {
+        $this->mixExtension = new MixExtension(self::WEB_DIR);
+    }
+
+    /**
+     * @test
+     */
+    public function mixFunctionReturnManifest()
+    {
+        $this->assertEquals(
+            'css/app-db9165hf67.css',
+            $this->mixExtension->mix('app.css')
+        );
+        $this->assertEquals(
+            'css/index-9rt53c9u67.css',
+            $this->mixExtension->mix('index.css')
+        );
+        $this->assertEquals(
+            'js/app-db9183c967.js',
+            $this->mixExtension->mix('app.js')
+        );
+    }
+
+    /**
+     * @test
+     */
+    public function elixirFunctionThrowsErrorWhenFileNotExists()
+    {
+        $this->expectException('\Exception');
+        $this->expectExceptionMessage('The "css/not_existing.css" key could not be found in the manifest file. '.
+        'Please pass just the asset filename as a parameter to the mix() method.');
+        $this->mixExtension->mix('css/not_existing.css');
+    }
+}

Tests/Twig/stub/manifest.json

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+{
+  "app.css": "css/app-db9165hf67.css",
+  "index.css": "css/index-9rt53c9u67.css",
+  "app.js": "js/app-db9183c967.js"
+}

phpunit.xml.dist

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+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit
+        backupStaticAttributes="false"
+
+        cacheTokens="false"
+        colors="false"
+        convertErrorsToExceptions="true"
+        convertNoticesToExceptions="true"
+        convertWarningsToExceptions="true"
+        forceCoversAnnotation="false"
+        mapTestClassNameToCoveredClassName="false"
+        printerClass="PHPUnit_TextUI_ResultPrinter"
+
+        processIsolation="false"
+        stopOnError="false"
+        stopOnFailure="false"
+        stopOnIncomplete="false"
+        stopOnSkipped="false"
+        testSuiteLoaderClass="PHPUnit_Runner_StandardTestSuiteLoader"
+
+        strict="false"
+        verbose="false"
+        >
+
+    <testsuites>
+        <testsuite name="AllTests">
+            <directory>Tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <filter>
+        <blacklist>
+            <directory suffix=".php"></directory>
+            <file></file>
+            <exclude>
+                <directory suffix=".php"></directory>
+                <file></file>
+            </exclude>
+        </blacklist>
+        <whitelist processUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php"></directory>
+            <file></file>
+            <exclude>
+                <directory suffix=".php"></directory>
+                <file></file>
+            </exclude>
+        </whitelist>
+    </filter>
+</phpunit>