tests/Fixtures/Standards/standard_with_ruleset/ruleset.xml

+<?xml version="1.0"?>
+<ruleset name="CustomStandard">
+</ruleset>

tests/Fixtures/Standards/standard_with_ruleset_without_name/ruleset.xml

+<?xml version="1.0"?>
+<ruleset name="">
+</ruleset>

tests/Integration/PHPCodeSniffer/FinderTest.php

+<?php
+
+namespace Higidi\ComposerPhpCSStandardsPlugin\Tests\Integration\PHPCodeSniffer\Standard;
+
+/*
+ * 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\PHPCodeSniffer\Finder;
+use Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Factory;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Integration test case for class \Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Finder
+ */
+class FinderTest extends TestCase
+{
+    /**
+     * @var Finder
+     */
+    protected $fixture;
+
+    /**
+     * @var Factory|\PHPUnit_Framework_MockObject_MockObject
+     */
+    protected $standardsFactoryMock;
+
+    protected function setUp()
+    {
+        parent::setUp();
+        $this->standardsFactoryMock = $this->getMockBuilder(
+            'Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Factory'
+        )
+            ->disableOriginalConstructor()
+            ->getMock();
+        $this->fixture = new Finder(null, $this->standardsFactoryMock);
+    }
+
+    protected function tearDown()
+    {
+        parent::tearDown();
+        unset($this->fixture);
+        unset($this->standardsFactoryMock);
+    }
+
+    public function testFinder()
+    {
+        $path = realpath(implode(DIRECTORY_SEPARATOR, [__DIR__, '..', '..', 'Fixtures', 'Standards']));
+        $expected = [
+            $path . DIRECTORY_SEPARATOR . 'Standard1',
+            $path . DIRECTORY_SEPARATOR . 'Standard2',
+            $path . DIRECTORY_SEPARATOR . 'Standard3',
+            $path . DIRECTORY_SEPARATOR . 'standard_with_ruleset',
+            $path . DIRECTORY_SEPARATOR . 'standard_with_ruleset_without_name',
+        ];
+
+        $this->standardsFactoryMock
+            ->expects($this->once())
+            ->method('create')
+            ->with($expected);
+        $this->fixture->in($path);
+    }
+}

tests/Unit/PHPCodeSniffer/FinderTest.php

+<?php
+
+namespace Higidi\ComposerPhpCSStandardsPlugin\Tests\Unit\PHPCodeSniffer\Standards\Standard;
+
+/*
+ * 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\PHPCodeSniffer\Finder;
+use Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Factory;
+use Higidi\ComposerPhpCSStandardsPlugin\Symfony\Finder\Factory as SymfonyFinderFactory;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Finder\Finder as SymfonyFinder;
+
+/**
+ * Test case for class \Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Finder
+ *
+ * @covers \Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Finder
+ */
+class FinderTest extends TestCase
+{
+    /**
+     * @var Finder
+     */
+    protected $classUnderTesting;
+
+    /**
+     * @var SymfonyFinderFactory|\PHPUnit_Framework_MockObject_MockObject
+     */
+    protected $symfonyFinderFactoryMock;
+
+    /**
+     * @var SymfonyFinder|\PHPUnit_Framework_MockObject_MockObject
+     */
+    protected $symfonyFinderMock;
+
+    /**
+     * @var Factory|\PHPUnit_Framework_MockObject_MockObject
+     */
+    protected $standardsFactoryMock;
+
+    protected function setUp()
+    {
+        parent::setUp();
+        $this->symfonyFinderFactoryMock = $this->getMockBuilder(
+            'Higidi\ComposerPhpCSStandardsPlugin\Symfony\Finder\Factory'
+        )->getMock();
+        $this->symfonyFinderMock = $this->getMockBuilder('Symfony\Component\Finder\Finder')->getMock();
+        $this->symfonyFinderFactoryMock
+            ->method('create')
+            ->willReturn($this->symfonyFinderMock);
+        $this->standardsFactoryMock = $this->getMockBuilder(
+            'Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Factory'
+        )
+            ->disableOriginalConstructor()
+            ->getMock();
+        $this->classUnderTesting = new Finder($this->symfonyFinderFactoryMock, $this->standardsFactoryMock);
+    }
+
+    protected function tearDown()
+    {
+        parent::tearDown();
+        unset($this->classUnderTesting);
+        unset($this->standardsFactoryMock);
+    }
+
+    public function testFinder()
+    {
+        $path = realpath(implode(DIRECTORY_SEPARATOR, [__DIR__, '..', '..', '..', 'Fixtures', 'Standards']));
+        $expected = [
+            $path . DIRECTORY_SEPARATOR . 'Standard1',
+        ];
+
+        foreach (['in', 'files', 'name', 'sortByName'] as $fluentMethod) {
+            $this->symfonyFinderMock
+                ->method($fluentMethod)
+                ->willReturn($this->symfonyFinderMock);
+        }
+
+        $splFileInfoMock = $this->getMockBuilder('Symfony\Component\Finder\SplFileInfo')
+            ->setConstructorArgs([null, null, null])
+            ->getMock();
+        $splFileInfoMock
+            ->expects($this->once())
+            ->method('getPath')
+            ->willReturn($path . DIRECTORY_SEPARATOR . 'Standard1');
+        $finderIterator = new \ArrayIterator(
+            [
+                $splFileInfoMock,
+            ]
+        );
+        $this->symfonyFinderMock
+            ->expects($this->once())
+            ->method('getIterator')
+            ->willReturn($finderIterator);
+        $this->standardsFactoryMock
+            ->expects($this->once())
+            ->method('create')
+            ->with($expected);
+        $this->classUnderTesting->in($path);
+    }
+}

tests/Unit/PHPCodeSniffer/Standards/FactoryTest.php

+<?php
+
+namespace Higidi\ComposerPhpCSStandardsPlugin\Tests\Unit\PHPCodeSniffer\Standards;
+
+/*
+ * 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\PHPCodeSniffer\Standards\Factory;
+use Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Standard\Factory as StandardFactory;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Test case for class \Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Factory
+ *
+ * @covers \Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Factory
+ */
+class FactoryTest extends TestCase
+{
+    /**
+     * @var Factory
+     */
+    protected $classUnderTesting;
+
+    /**
+     * @var StandardFactory|\PHPUnit_Framework_MockObject_MockObject
+     */
+    protected $standardFactoryMock;
+
+    protected function setUp()
+    {
+        parent::setUp();
+        $this->standardFactoryMock = $this->getMockBuilder(
+            'Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Standard\Factory'
+        )->getMock();
+        $this->standardFactoryMock
+            ->method('create')
+            ->willReturn(
+                $this->getMockBuilder('Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Standard\Standard')
+                    ->disableOriginalConstructor()
+                    ->getMock()
+            );
+
+        $this->classUnderTesting = new Factory($this->standardFactoryMock);
+    }
+
+    protected function tearDown()
+    {
+        parent::tearDown();
+        unset($this->standardFactoryMock);
+        unset($this->classUnderTesting);
+    }
+
+    public function testCreateStandard()
+    {
+        $paths = [];
+        $paths[] = implode(
+            DIRECTORY_SEPARATOR,
+            [__DIR__, '..', '..', '..', '..', 'Fixtures', 'Standards', 'Standard1']
+        );
+        $this->standardFactoryMock
+            ->expects($this->exactly(count($paths)))
+            ->method('create')
+            ->withConsecutive($paths);
+
+        $standards = $this->classUnderTesting->create($paths);
+
+        $this->assertInstanceOf('Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Standards', $standards);
+    }
+}

tests/Unit/PHPCodeSniffer/Standards/Standard/FactoryTest.php

+<?php
+
+namespace Higidi\ComposerPhpCSStandardsPlugin\Tests\Unit\PHPCodeSniffer\Standards\Standard;
+
+/*
+ * 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\PHPCodeSniffer\Standards\Standard\Factory;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Test case for class \Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Standard\Factory
+ *
+ * @covers \Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Standard\Factory
+ */
+class FactoryTest extends TestCase
+{
+    /**
+     * @var Factory
+     */
+    protected $classUnderTesting;
+
+    protected function setUp()
+    {
+        parent::setUp();
+        $this->classUnderTesting = new Factory();
+    }
+
+    protected function tearDown()
+    {
+        parent::tearDown();
+        unset($this->classUnderTesting);
+    }
+
+    public function testCreateStandard()
+    {
+        $path = implode(
+            DIRECTORY_SEPARATOR,
+            [__DIR__, '..', '..', '..', '..', 'Fixtures', 'Standards', 'Standard1']
+        );
+        $standard = $this->classUnderTesting->create($path);
+
+        $this->assertInstanceOf(
+            'Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Standard\Standard',
+            $standard
+        );
+    }
+}

tests/Unit/PHPCodeSniffer/Standards/Standard/StandardTest.php

+<?php
+
+namespace Higidi\ComposerPhpCSStandardsPlugin\Tests\Unit\PHPCodeSniffer\Standards\Standard;
+
+/*
+ * 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\PHPCodeSniffer\Standards\Standard\Standard;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Test case for class \Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Standard\Standard
+ *
+ * @covers \Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Standard\Standard
+ */
+class StandardTest extends TestCase
+{
+    /**
+     * @dataProvider differentStandards
+     *
+     * @param string $standardName
+     * @param string $expectedName
+     */
+    public function testStandard($standardName, $expectedName)
+    {
+        $path = implode(
+            DIRECTORY_SEPARATOR,
+            [__DIR__, '..', '..', '..', '..', 'Fixtures', 'Standards', $standardName]
+        );
+        $ruleSetXmlPath = $path . DIRECTORY_SEPARATOR . 'ruleset.xml';
+
+        $standard = new Standard($path);
+
+        $this->assertSame(
+            $expectedName,
+            $standard->getName(),
+            'The standard instance did not return the expected name.'
+        );
+        $this->assertSame(
+            realpath($path),
+            $standard->getPath(),
+            'The standard instance did not return the expected path value.'
+        );
+        $this->assertSame(
+            $ruleSetXmlPath,
+            $standard->getRuleSetXmlPath(),
+            'The standard instance did not return the expected ruleset.xml path value.'
+        );
+    }
+
+    public function differentStandards()
+    {
+        return [
+            'No Ruleset' => [
+                'Standard1',
+                'Standard1',
+            ],
+            'Ruleset with name' => [
+                'standard_with_ruleset',
+                'CustomStandard',
+            ],
+            'Ruleset without name' => [
+                'standard_with_ruleset_without_name',
+                'standard_with_ruleset_without_name',
+            ],
+        ];
+    }
+
+    /**
+     * @expectedException \Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Standard\Exception\StandardPathAccessDeniedException
+     */
+    public function testIfStandardPathAccessDeniedExceptionIsThrown()
+    {
+        new Standard('foo');
+    }
+
+    /**
+     * @expectedException \Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Standard\Exception\InvalidStandardException
+     */
+    public function testIfInvalidStandardExceptionIsThrown()
+    {
+        $path = implode(
+            DIRECTORY_SEPARATOR,
+            [__DIR__, '..', '..', '..', '..', 'Fixtures', 'Standards', 'InvalidStandard']
+        );
+
+        new Standard($path);
+    }
+}

tests/Unit/PHPCodeSniffer/Standards/StandardsTest.php

+<?php
+
+namespace Higidi\ComposerPhpCSStandardsPlugin\Tests\Unit\PHPCodeSniffer\Standards;
+
+/*
+ * 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\PHPCodeSniffer\Standards\Standard\StandardInterface;
+use Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Standards;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Test case for "\Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Standards".
+ *
+ * @covers \Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Standards
+ */
+class StandardsTest extends TestCase
+{
+    /**
+     * @param string $name
+     *
+     * @return StandardInterface
+     */
+    protected function createStandardMock($name)
+    {
+        $standard = $this->prophesize(
+            '\Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards\Standard\StandardInterface'
+        );
+        $standard
+            ->getName()
+            ->willReturn($name);
+
+        return $standard->reveal();
+    }
+
+    /**
+     * @test
+     */
+    public function itImplementsTheIteratorInterface()
+    {
+        $sut = new Standards();
+
+        $this->assertInstanceOf('\Iterator', $sut);
+    }
+
+    /**
+     * @test
+     */
+    public function itHasAnEmptyArrayAsDefaultStandards()
+    {
+        $sut = new Standards();
+
+        $standards = $sut->getStandards();
+
+        $this->assertInternalType('array', $standards);
+        $this->assertEmpty($standards);
+    }
+
+    /**
+     * @test
+     */
+    public function itAcceptsStandardViaConstructor()
+    {
+        $standards = [
+            $this->createStandardMock('standard1'),
+            $this->createStandardMock('standard2'),
+            $this->createStandardMock('standard3'),
+        ];
+
+        $sut = new Standards($standards);
+
+        $this->assertSame($standards, $sut->getStandards());
+    }
+
+    /**
+     * @test
+     */
+    public function itHoldsStandards()
+    {
+        $standards = [
+            $this->createStandardMock('standard1'),
+            $this->createStandardMock('standard2'),
+            $this->createStandardMock('standard3'),
+        ];
+
+        $sut = new Standards();
+        $sut->setStandards($standards);
+
+        $this->assertSame($standards, $sut->getStandards());
+
+        return $sut;
+    }
+
+    /**
+     * @test
+     * @depends itHoldsStandards
+     *
+     * @param Standards $sut
+     */
+    public function itCanAddStandardsToTheSet(Standards $sut)
+    {
+        $standards = $sut->getStandards();
+        $newStandard = $this->createStandardMock('standard4');
+
+        $this->assertSame($standards, $sut->getStandards());
+        $sut->addStandard($newStandard);
+
+        $expectedStandards = array_merge($standards, [$newStandard]);
+        $this->assertSame($expectedStandards, $sut->getStandards());
+    }
+
+    /**
+     * @test
+     * @depends itHoldsStandards
+     *
+     * @param Standards $sut
+     */
+    public function itCanRemoveStandardsFromTheSet(Standards $sut)
+    {
+        $standards = $sut->getStandards();
+        $removeableStandard = array_shift($standards);
+
+        $sut->removeStandard($removeableStandard);
+
+        $this->assertSame($standards, $sut->getStandards());
+    }
+
+    /**
+     * @return array
+     */
+    public function differentStandardIdentifierTypesDataProvider()
+    {
+        $standardName = 'blafoo';
+        $standard = $this->createStandardMock($standardName);
+
+        return [
+            'as_string' => [$standard, $standardName],
+            'as_object' => [$standard, $standard],
+        ];
+    }
+
+    /**
+     * @test
+     * @dataProvider differentStandardIdentifierTypesDataProvider
+     *
+     * @param StandardInterface $standard
+     * @param string|object $identifier
+     */
+    public function itReturnsWhetherItHoldsAStandardOrNot(StandardInterface $standard, $identifier)
+    {
+        $sut = new Standards();
+        $this->assertFalse($sut->hasStandard($identifier));
+
+        $sut->addStandard($standard);
+        $this->assertTrue($sut->hasStandard($identifier));
+    }
+
+    /**
+     * @test
+     * @dataProvider differentStandardIdentifierTypesDataProvider
+     *
+     * @param StandardInterface $standard
+     * @param string|object $identifier
+     */
+    public function itReturnsAStandardItHolds(StandardInterface $standard, $identifier)
+    {
+        $sut = new Standards();
+        $this->assertNull($sut->getStandard($identifier));
+
+        $sut->addStandard($standard);
+        $this->assertSame($standard, $sut->getStandard($identifier));
+    }
+
+    /**
+     * @test
+     */
+    public function itIsIteratable()
+    {
+        $standards = [
+            $this->createStandardMock('standard1'),
+            $this->createStandardMock('standard2'),
+            $this->createStandardMock('standard3'),
+        ];
+        $iteratedStandards = [];
+
+        $sut = new Standards($standards);
+        foreach ($sut as $key => $standard) {
+            $iteratedStandards[$key] = $standard;
+        }
+
+        $this->assertSame($standards, $iteratedStandards);
+    }
+}

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());
+    }
+}

tests/Unit/Symfony/Finder/FactoryTest.php

+<?php
+
+namespace Higidi\ComposerPhpCSStandardsPlugin\Tests\Unit\Symfony\Finder;
+
+/*
+ * 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\Symfony\Finder\Factory;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Test case for class \Higidi\ComposerPhpCSStandardsPlugin\Symfony\Finder\Factory
+ *
+ * @covers \Higidi\ComposerPhpCSStandardsPlugin\Symfony\Finder\Factory
+ */
+class FactoryTest extends TestCase
+{
+    public function testCreateFinder()
+    {
+        $factory = new Factory();
+        $finder = $factory->create();
+
+        $this->assertInstanceOf('Symfony\Component\Finder\Finder', $finder);
+    }
+}

tests/bootstrap.php

 <?php
 
+/*
+ * 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.
+ */
+
 error_reporting(E_ALL);
 
 if (function_exists('date_default_timezone_set') && function_exists('date_default_timezone_get')) {
@@ -11,7 +30,7 @@ function includeIfExists($file)
     return file_exists($file) ? include $file : false;
 }
 
-if (!$autoLoader = includeIfExists(__DIR__ . '/../vendor/autoload.php')) {
+if (! $autoLoader = includeIfExists(__DIR__ . '/../vendor/autoload.php')) {
     echo 'You must set up the project dependencies, run the following command from the project root:' . PHP_EOL .
         'php composer.phar install' . PHP_EOL;
     exit(1);