diff --git a/src/Composer/Downloader/VcsDownloader.php b/src/Composer/Downloader/VcsDownloader.php
index 7843dcfde..8c264f7bb 100644
--- a/src/Composer/Downloader/VcsDownloader.php
+++ b/src/Composer/Downloader/VcsDownloader.php
@@ -47,7 +47,7 @@ abstract class VcsDownloader implements DownloaderInterface
     public function download(PackageInterface $package, $path)
     {
         if (!$package->getSourceReference()) {
-            throw new \InvalidArgumentException('The given package is missing reference information');
+            throw new \InvalidArgumentException('Package '.$package->getPrettyName().' is missing reference information');
         }
 
         $this->io->write("  - Package <info>" . $package->getName() . "</info> (<comment>" . $package->getPrettyVersion() . "</comment>)");
@@ -62,7 +62,7 @@ abstract class VcsDownloader implements DownloaderInterface
     public function update(PackageInterface $initial, PackageInterface $target, $path)
     {
         if (!$target->getSourceReference()) {
-            throw new \InvalidArgumentException('The given package is missing reference information');
+            throw new \InvalidArgumentException('Package '.$target->getPrettyName().' is missing reference information');
         }
 
         $this->io->write("  - Package <info>" . $target->getName() . "</info> (<comment>" . $target->getPrettyVersion() . "</comment>)");
diff --git a/tests/Composer/Test/Downloader/GitDownloaderTest.php b/tests/Composer/Test/Downloader/GitDownloaderTest.php
index 885a80d35..389f4ddb7 100644
--- a/tests/Composer/Test/Downloader/GitDownloaderTest.php
+++ b/tests/Composer/Test/Downloader/GitDownloaderTest.php
@@ -16,6 +16,15 @@ use Composer\Downloader\GitDownloader;
 
 class GitDownloaderTest extends \PHPUnit_Framework_TestCase
 {
+    protected function getDownloaderMock($io = null, $executor = null, $filesystem = null)
+    {
+        $io = $io ?: $this->getMock('Composer\IO\IOInterface');
+        $executor = $executor ?: $this->getMock('Composer\Util\ProcessExecutor');
+        $filesystem = $filesystem ?: $this->getMock('Composer\Util\Filesystem');
+
+        return new GitDownloader($io, $executor, $filesystem);
+    }
+
     /**
      * @expectedException \InvalidArgumentException
      */
@@ -26,27 +35,60 @@ class GitDownloaderTest extends \PHPUnit_Framework_TestCase
             ->method('getSourceReference')
             ->will($this->returnValue(null));
 
-        $downloader = new GitDownloader($this->getMock('Composer\IO\IOInterface'));
+        $downloader = $this->getDownloaderMock();
         $downloader->download($packageMock, '/path');
     }
 
     public function testDownload()
     {
-        $expectedGitCommand = $this->getCmd('git clone \'https://github.com/l3l0/composer\' \'composerPath\' && cd \'composerPath\' && git checkout \'ref\' && git reset --hard \'ref\'');
+        $expectedGitCommand = $this->getCmd('git clone \'https://example.com/composer/composer\' \'composerPath\' && cd \'composerPath\' && git checkout \'ref\' && git reset --hard \'ref\'');
         $packageMock = $this->getMock('Composer\Package\PackageInterface');
         $packageMock->expects($this->any())
             ->method('getSourceReference')
             ->will($this->returnValue('ref'));
-        $packageMock->expects($this->once())
+        $packageMock->expects($this->any())
             ->method('getSourceUrl')
-            ->will($this->returnValue('https://github.com/l3l0/composer'));
+            ->will($this->returnValue('https://example.com/composer/composer'));
         $processExecutor = $this->getMock('Composer\Util\ProcessExecutor');
         $processExecutor->expects($this->once())
             ->method('execute')
             ->with($this->equalTo($expectedGitCommand))
             ->will($this->returnValue(0));
 
-        $downloader = new GitDownloader($this->getMock('Composer\IO\IOInterface'), $processExecutor);
+        $downloader = $this->getDownloaderMock(null, $processExecutor);
+        $downloader->download($packageMock, 'composerPath');
+    }
+
+    public function testDownloadUsesVariousProtocolsForGithub()
+    {
+        $packageMock = $this->getMock('Composer\Package\PackageInterface');
+        $packageMock->expects($this->any())
+            ->method('getSourceReference')
+            ->will($this->returnValue('ref'));
+        $packageMock->expects($this->once())
+            ->method('getSourceUrl')
+            ->will($this->returnValue('https://github.com/composer/composer'));
+        $processExecutor = $this->getMock('Composer\Util\ProcessExecutor');
+
+        $expectedGitCommand = $this->getCmd('git clone \'git://github.com/composer/composer\' \'composerPath\' && cd \'composerPath\' && git checkout \'ref\' && git reset --hard \'ref\'');
+        $processExecutor->expects($this->at(0))
+            ->method('execute')
+            ->with($this->equalTo($expectedGitCommand))
+            ->will($this->returnValue(1));
+
+        $expectedGitCommand = $this->getCmd('git clone \'https://github.com/composer/composer\' \'composerPath\' && cd \'composerPath\' && git checkout \'ref\' && git reset --hard \'ref\'');
+        $processExecutor->expects($this->at(1))
+            ->method('execute')
+            ->with($this->equalTo($expectedGitCommand))
+            ->will($this->returnValue(1));
+
+        $expectedGitCommand = $this->getCmd('git clone \'http://github.com/composer/composer\' \'composerPath\' && cd \'composerPath\' && git checkout \'ref\' && git reset --hard \'ref\'');
+        $processExecutor->expects($this->at(2))
+            ->method('execute')
+            ->with($this->equalTo($expectedGitCommand))
+            ->will($this->returnValue(0));
+
+        $downloader = $this->getDownloaderMock(null, $processExecutor);
         $downloader->download($packageMock, 'composerPath');
     }
 
@@ -55,21 +97,21 @@ class GitDownloaderTest extends \PHPUnit_Framework_TestCase
      */
     public function testDownloadThrowsRuntimeExceptionIfGitCommandFails()
     {
-        $expectedGitCommand = $this->getCmd('git clone \'https://github.com/l3l0/composer\' \'composerPath\' && cd \'composerPath\' && git checkout \'ref\' && git reset --hard \'ref\'');
+        $expectedGitCommand = $this->getCmd('git clone \'https://example.com/composer/composer\' \'composerPath\' && cd \'composerPath\' && git checkout \'ref\' && git reset --hard \'ref\'');
         $packageMock = $this->getMock('Composer\Package\PackageInterface');
         $packageMock->expects($this->any())
             ->method('getSourceReference')
             ->will($this->returnValue('ref'));
-        $packageMock->expects($this->once())
+        $packageMock->expects($this->any())
             ->method('getSourceUrl')
-            ->will($this->returnValue('https://github.com/l3l0/composer'));
+            ->will($this->returnValue('https://example.com/composer/composer'));
         $processExecutor = $this->getMock('Composer\Util\ProcessExecutor');
         $processExecutor->expects($this->once())
             ->method('execute')
             ->with($this->equalTo($expectedGitCommand))
             ->will($this->returnValue(1));
 
-        $downloader = new GitDownloader($this->getMock('Composer\IO\IOInterface'), $processExecutor);
+        $downloader = $this->getDownloaderMock(null, $processExecutor);
         $downloader->download($packageMock, 'composerPath');
     }
 
@@ -84,7 +126,7 @@ class GitDownloaderTest extends \PHPUnit_Framework_TestCase
             ->method('getSourceReference')
             ->will($this->returnValue(null));
 
-        $downloader = new GitDownloader($this->getMock('Composer\IO\IOInterface'));
+        $downloader = $this->getDownloaderMock();
         $downloader->update($initialPackageMock, $sourcePackageMock, '/path');
     }
 
@@ -110,7 +152,7 @@ class GitDownloaderTest extends \PHPUnit_Framework_TestCase
             ->with($this->equalTo($expectedGitUpdateCommand))
             ->will($this->returnValue(0));
 
-        $downloader = new GitDownloader($this->getMock('Composer\IO\IOInterface'), $processExecutor);
+        $downloader = $this->getDownloaderMock(null, $processExecutor);
         $downloader->update($packageMock, $packageMock, 'composerPath');
     }
 
@@ -139,7 +181,7 @@ class GitDownloaderTest extends \PHPUnit_Framework_TestCase
             ->with($this->equalTo($expectedGitUpdateCommand))
             ->will($this->returnValue(1));
 
-        $downloader = new GitDownloader($this->getMock('Composer\IO\IOInterface'), $processExecutor);
+        $downloader = $this->getDownloaderMock(null, $processExecutor);
         $downloader->update($packageMock, $packageMock, 'composerPath');
     }
 
@@ -158,13 +200,13 @@ class GitDownloaderTest extends \PHPUnit_Framework_TestCase
             ->method('removeDirectory')
             ->with($this->equalTo('composerPath'));
 
-        $downloader = new GitDownloader($this->getMock('Composer\IO\IOInterface'), $processExecutor, $filesystem);
+        $downloader = $this->getDownloaderMock(null, $processExecutor, $filesystem);
         $downloader->remove($packageMock, 'composerPath');
     }
 
     public function testGetInstallationSource()
     {
-        $downloader = new GitDownloader($this->getMock('Composer\IO\IOInterface'));
+        $downloader = $this->getDownloaderMock();
 
         $this->assertEquals('source', $downloader->getInstallationSource());
     }
diff --git a/tests/Composer/Test/Downloader/HgDownloaderTest.php b/tests/Composer/Test/Downloader/HgDownloaderTest.php
index a7c246394..39e1efb17 100644
--- a/tests/Composer/Test/Downloader/HgDownloaderTest.php
+++ b/tests/Composer/Test/Downloader/HgDownloaderTest.php
@@ -16,6 +16,15 @@ use Composer\Downloader\HgDownloader;
 
 class HgDownloaderTest extends \PHPUnit_Framework_TestCase
 {
+    protected function getDownloaderMock($io = null, $executor = null, $filesystem = null)
+    {
+        $io = $io ?: $this->getMock('Composer\IO\IOInterface');
+        $executor = $executor ?: $this->getMock('Composer\Util\ProcessExecutor');
+        $filesystem = $filesystem ?: $this->getMock('Composer\Util\Filesystem');
+
+        return new HgDownloader($io, $executor, $filesystem);
+    }
+
     /**
      * @expectedException \InvalidArgumentException
      */
@@ -26,7 +35,7 @@ class HgDownloaderTest extends \PHPUnit_Framework_TestCase
             ->method('getSourceReference')
             ->will($this->returnValue(null));
 
-        $downloader = new HgDownloader($this->getMock('Composer\IO\IOInterface'));
+        $downloader = $this->getDownloaderMock();
         $downloader->download($packageMock, '/path');
     }
 
@@ -45,7 +54,7 @@ class HgDownloaderTest extends \PHPUnit_Framework_TestCase
             ->method('execute')
             ->with($this->equalTo($expectedGitCommand));
 
-        $downloader = new HgDownloader($this->getMock('Composer\IO\IOInterface'), $processExecutor);
+        $downloader = $this->getDownloaderMock(null, $processExecutor);
         $downloader->download($packageMock, 'composerPath');
     }
 
@@ -60,7 +69,7 @@ class HgDownloaderTest extends \PHPUnit_Framework_TestCase
             ->method('getSourceReference')
             ->will($this->returnValue(null));
 
-        $downloader = new HgDownloader($this->getMock('Composer\IO\IOInterface'));
+        $downloader = $this->getDownloaderMock();
         $downloader->update($initialPackageMock, $sourcePackageMock, '/path');
     }
 
@@ -84,7 +93,7 @@ class HgDownloaderTest extends \PHPUnit_Framework_TestCase
             ->method('execute')
             ->with($this->equalTo($expectedUpdateCommand));
 
-        $downloader = new HgDownloader($this->getMock('Composer\IO\IOInterface'), $processExecutor);
+        $downloader = $this->getDownloaderMock(null, $processExecutor);
         $downloader->update($packageMock, $packageMock, 'composerPath');
     }
 
@@ -102,13 +111,13 @@ class HgDownloaderTest extends \PHPUnit_Framework_TestCase
             ->method('removeDirectory')
             ->with($this->equalTo('composerPath'));
 
-        $downloader = new HgDownloader($this->getMock('Composer\IO\IOInterface'), $processExecutor, $filesystem);
+        $downloader = $this->getDownloaderMock(null, $processExecutor, $filesystem);
         $downloader->remove($packageMock, 'composerPath');
     }
 
     public function testGetInstallationSource()
     {
-        $downloader = new HgDownloader($this->getMock('Composer\IO\IOInterface'));
+        $downloader = $this->getDownloaderMock(null);
 
         $this->assertEquals('source', $downloader->getInstallationSource());
     }
diff --git a/tests/Composer/Test/Installer/LibraryInstallerTest.php b/tests/Composer/Test/Installer/LibraryInstallerTest.php
index b89bf9b9a..100ebb60e 100644
--- a/tests/Composer/Test/Installer/LibraryInstallerTest.php
+++ b/tests/Composer/Test/Installer/LibraryInstallerTest.php
@@ -49,13 +49,8 @@ class LibraryInstallerTest extends TestCase
 
     protected function tearDown()
     {
-        if (is_dir($this->vendorDir)) {
-            $this->fs->removeDirectory($this->vendorDir);
-        }
-
-        if (is_dir($this->binDir)) {
-            $this->fs->removeDirectory($this->binDir);
-        }
+        $this->fs->removeDirectory($this->vendorDir);
+        $this->fs->removeDirectory($this->binDir);
     }
 
     public function testInstallerCreationShouldNotCreateVendorDirectory()