FEATURE: Plugin test cases

src/Plugin.php

@@ -25,6 +25,9 @@ use Composer\Composer;
 use Composer\IO\IOInterface;
 use Composer\Plugin\PluginInterface;
 
+/**
+ * Plugin class register our plugin with composer.
+ */
 class Plugin implements PluginInterface
 {
     /**

tests/Unit/PluginTest.php

+<?php
+
+namespace Higidi\ComposerPhpCSStandardsPlugin\Tests\Unit;
+
+/*
+ * Copyright (C) 2017  Daniel Hürtgen <daniel@higidi.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+use Higidi\ComposerPhpCSStandardsPlugin\Plugin;
+use PHPUnit\Framework\TestCase;
+use Prophecy\Argument;
+
+/**
+ * Test case for "\Higidi\ComposerPhpCSStandardsPlugin\Plugin".
+ *
+ * @covers \Higidi\ComposerPhpCSStandardsPlugin\Plugin
+ */
+class PluginTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function itImplementsThePluginInterface()
+    {
+        $sut = new Plugin();
+
+        $this->assertInstanceOf('\Composer\Plugin\PluginInterface', $sut);
+    }
+
+    /**
+     * @test
+     */
+    public function itRegisteredThePhpCSStandardsInstallerToComposer()
+    {
+        $installationManager = $this->prophesize('\Composer\Installer\InstallationManager');
+        $installationManager
+            ->addInstaller(Argument::type('\Higidi\ComposerPhpCSStandardsPlugin\Installer'))
+            ->shouldBeCalled();
+        $downloadManager = $this->prophesize('\Composer\Downloader\DownloadManager');
+        $config = $this->prophesize('\Composer\Config');
+        $composer = $this->prophesize('\Composer\Composer');
+        $composer
+            ->getInstallationManager()
+            ->willReturn($installationManager->reveal());
+        $composer
+            ->getDownloadManager()
+            ->willReturn($downloadManager->reveal());
+        $composer
+            ->getConfig()
+            ->willReturn($config->reveal());
+        $io = $this->prophesize('\Composer\IO\IOInterface');
+
+        $sut = new Plugin();
+
+        $sut->activate($composer->reveal(), $io->reveal());
+    }
+}