New test to check git download behavior with cache.

tests/Composer/Test/Downloader/GitDownloaderTest.php

@@ -123,6 +123,65 @@ class GitDownloaderTest extends TestCase
         $downloader->download($packageMock, 'composerPath');
     }
 
+    public function testDownloadWithCache()
+    {
+        $packageMock = $this->getMock('Composer\Package\PackageInterface');
+        $packageMock->expects($this->any())
+            ->method('getSourceReference')
+            ->will($this->returnValue('1234567890123456789012345678901234567890'));
+        $packageMock->expects($this->any())
+            ->method('getSourceUrls')
+            ->will($this->returnValue(array('https://example.com/composer/composer')));
+        $packageMock->expects($this->any())
+            ->method('getSourceUrl')
+            ->will($this->returnValue('https://example.com/composer/composer'));
+        $packageMock->expects($this->any())
+            ->method('getPrettyVersion')
+            ->will($this->returnValue('dev-master'));
+        $processExecutor = $this->getMock('Composer\Util\ProcessExecutor');
+
+        $processExecutor->expects($this->at(0))
+            ->method('execute')
+            ->with($this->equalTo($this->winCompat('git --version')))
+            ->will($this->returnCallback(function($command, &$output = null) {
+                $output = 'git version 2.3.1';
+                return 0;
+            }));
+
+        $config = new Config;
+        $this->setupConfig($config);
+        $cachePath = $config->get('cache-vcs-dir').'/'.preg_replace('{[^a-z0-9.]}i', '-', 'https://example.com/composer/composer').'/';
+        $expectedGitCommand = $this->winCompat(sprintf("git clone --mirror 'https://example.com/composer/composer' '%s'", $cachePath));
+        $processExecutor->expects($this->at(1))
+            ->method('execute')
+            ->with($this->equalTo($expectedGitCommand))
+            ->will($this->returnValue(0));
+
+        $expectedGitCommand = $this->winCompat(sprintf("git clone --no-checkout 'https://example.com/composer/composer' 'composerPath' --dissociate --reference '%s' && cd 'composerPath' && git remote add composer 'https://example.com/composer/composer' && git fetch composer", $cachePath));
+        $processExecutor->expects($this->at(2))
+            ->method('execute')
+            ->with($this->equalTo($expectedGitCommand))
+            ->will($this->returnValue(0));
+
+        $processExecutor->expects($this->at(3))
+            ->method('execute')
+            ->with($this->equalTo($this->winCompat("git branch -r")), $this->equalTo(null), $this->equalTo($this->winCompat('composerPath')))
+            ->will($this->returnValue(0));
+
+        $processExecutor->expects($this->at(4))
+            ->method('execute')
+            ->with($this->equalTo($this->winCompat("git checkout 'master' --")), $this->equalTo(null), $this->equalTo($this->winCompat('composerPath')))
+            ->will($this->returnValue(0));
+
+        $processExecutor->expects($this->at(5))
+            ->method('execute')
+            ->with($this->equalTo($this->winCompat("git reset --hard '1234567890123456789012345678901234567890' --")), $this->equalTo(null), $this->equalTo($this->winCompat('composerPath')))
+            ->will($this->returnValue(0));
+
+        $downloader = $this->getDownloaderMock(null, $config, $processExecutor);
+        $downloader->download($packageMock, 'composerPath');
+    }
+
     public function testDownloadUsesVariousProtocolsAndSetsPushUrlForGithub()
     {
         $packageMock = $this->getMock('Composer\Package\PackageInterface');