diff --git a/tests/Composer/Test/Autoload/AutoloadGeneratorTest.php b/tests/Composer/Test/Autoload/AutoloadGeneratorTest.php
index ce33801ac..502a483ab 100644
--- a/tests/Composer/Test/Autoload/AutoloadGeneratorTest.php
+++ b/tests/Composer/Test/Autoload/AutoloadGeneratorTest.php
@@ -42,6 +42,11 @@ class AutoloadGeneratorTest extends TestCase
      */
     private $workingDir;
 
+    /**
+     * @var string
+     */
+    private $origDir;
+
     /**
      * @var InstallationManager|MockObject
      */
diff --git a/tests/Composer/Test/CacheTest.php b/tests/Composer/Test/CacheTest.php
index b01dbfd89..293064598 100644
--- a/tests/Composer/Test/CacheTest.php
+++ b/tests/Composer/Test/CacheTest.php
@@ -12,8 +12,8 @@
 
 namespace Composer\Test;
 
-use Composer\Cache;
 use Composer\TestCase;
+use Composer\Util\Filesystem;
 
 class CacheTest extends TestCase
 {
@@ -48,6 +48,14 @@ class CacheTest extends TestCase
             ->will($this->returnValue($this->finder));
     }
 
+    protected function tearDown()
+    {
+        if (is_dir($this->root)) {
+            $fs = new Filesystem;
+            $fs->removeDirectory($this->root);
+        }
+    }
+
     public function testRemoveOutdatedFiles()
     {
         $outdated = array_slice($this->files, 1);
diff --git a/tests/Composer/Test/Downloader/GitDownloaderTest.php b/tests/Composer/Test/Downloader/GitDownloaderTest.php
index 7521ac51a..f0b6699e5 100644
--- a/tests/Composer/Test/Downloader/GitDownloaderTest.php
+++ b/tests/Composer/Test/Downloader/GitDownloaderTest.php
@@ -18,6 +18,24 @@ use Composer\Util\Filesystem;
 
 class GitDownloaderTest extends \PHPUnit_Framework_TestCase
 {
+    /** @var Filesystem */
+    private $fs;
+    /** @var string */
+    private $workingDir;
+
+    protected function setUp()
+    {
+        $this->fs = new Filesystem;
+        $this->workingDir = realpath(sys_get_temp_dir()).DIRECTORY_SEPARATOR.'cmptest-'.md5(uniqid('', true));
+    }
+
+    protected function tearDown()
+    {
+        if (is_dir($this->workingDir)) {
+            $this->fs->removeDirectory($this->workingDir);
+        }
+    }
+
     protected function getDownloaderMock($io = null, $config = null, $executor = null, $filesystem = null)
     {
         $io = $io ?: $this->getMock('Composer\IO\IOInterface');
@@ -234,9 +252,6 @@ class GitDownloaderTest extends \PHPUnit_Framework_TestCase
     {
         $expectedGitUpdateCommand = $this->winCompat("git remote set-url composer 'git://github.com/composer/composer' && git fetch composer && git fetch --tags composer");
 
-        $tmpDir = realpath(sys_get_temp_dir()).DIRECTORY_SEPARATOR.'cmptest-'.md5(uniqid('', true));
-        $fs = new Filesystem;
-        $fs->ensureDirectoryExists($tmpDir.'/.git');
         $packageMock = $this->getMock('Composer\Package\PackageInterface');
         $packageMock->expects($this->any())
             ->method('getSourceReference')
@@ -266,23 +281,22 @@ class GitDownloaderTest extends \PHPUnit_Framework_TestCase
             ->will($this->returnValue(0));
         $processExecutor->expects($this->at(4))
             ->method('execute')
-            ->with($this->equalTo($this->winCompat("git checkout 'ref' -- && git reset --hard 'ref' --")), $this->equalTo(null), $this->equalTo($this->winCompat($tmpDir)))
+            ->with($this->equalTo($this->winCompat("git checkout 'ref' -- && git reset --hard 'ref' --")), $this->equalTo(null), $this->equalTo($this->winCompat($this->workingDir)))
             ->will($this->returnValue(0));
 
+        $this->fs->ensureDirectoryExists($this->workingDir.'/.git');
         $downloader = $this->getDownloaderMock(null, new Config(), $processExecutor);
-        $downloader->update($packageMock, $packageMock, $tmpDir);
+        $downloader->update($packageMock, $packageMock, $this->workingDir);
     }
 
     /**
+     * @group failing
      * @expectedException \RuntimeException
      */
     public function testUpdateThrowsRuntimeExceptionIfGitCommandFails()
     {
         $expectedGitUpdateCommand = $this->winCompat("git remote set-url composer 'git://github.com/composer/composer' && git fetch composer && git fetch --tags composer");
 
-        $tmpDir = realpath(sys_get_temp_dir()).DIRECTORY_SEPARATOR.'cmptest-'.md5(uniqid('', true));
-        $fs = new Filesystem;
-        $fs->ensureDirectoryExists($tmpDir.'/.git');
         $packageMock = $this->getMock('Composer\Package\PackageInterface');
         $packageMock->expects($this->any())
             ->method('getSourceReference')
@@ -303,9 +317,10 @@ class GitDownloaderTest extends \PHPUnit_Framework_TestCase
             ->method('execute')
             ->with($this->equalTo($expectedGitUpdateCommand))
             ->will($this->returnValue(1));
-
+        
+        $this->fs->ensureDirectoryExists($this->workingDir.'/.git');
         $downloader = $this->getDownloaderMock(null, new Config(), $processExecutor);
-        $downloader->update($packageMock, $packageMock, $tmpDir);
+        $downloader->update($packageMock, $packageMock, $this->workingDir);
     }
 
     public function testRemove()
diff --git a/tests/Composer/Test/Downloader/HgDownloaderTest.php b/tests/Composer/Test/Downloader/HgDownloaderTest.php
index ab9ec28cd..b2dee627b 100644
--- a/tests/Composer/Test/Downloader/HgDownloaderTest.php
+++ b/tests/Composer/Test/Downloader/HgDownloaderTest.php
@@ -17,6 +17,22 @@ use Composer\Util\Filesystem;
 
 class HgDownloaderTest extends \PHPUnit_Framework_TestCase
 {
+    /** @var string */
+    private $workingDir;
+
+    protected function setUp()
+    {
+        $this->workingDir = realpath(sys_get_temp_dir()).DIRECTORY_SEPARATOR.'cmptest-'.md5(uniqid('', true));
+    }
+
+    protected function tearDown()
+    {
+        if (is_dir($this->workingDir)) {
+            $fs = new Filesystem;
+            $fs->removeDirectory($this->workingDir);
+        }
+    }
+
     protected function getDownloaderMock($io = null, $config = null, $executor = null, $filesystem = null)
     {
         $io = $io ?: $this->getMock('Composer\IO\IOInterface');
@@ -85,9 +101,8 @@ class HgDownloaderTest extends \PHPUnit_Framework_TestCase
 
     public function testUpdate()
     {
-        $tmpDir = realpath(sys_get_temp_dir()).DIRECTORY_SEPARATOR.'cmptest-'.md5(uniqid('', true));
         $fs = new Filesystem;
-        $fs->ensureDirectoryExists($tmpDir.'/.hg');
+        $fs->ensureDirectoryExists($this->workingDir.'/.hg');
         $packageMock = $this->getMock('Composer\Package\PackageInterface');
         $packageMock->expects($this->any())
             ->method('getSourceReference')
@@ -109,7 +124,7 @@ class HgDownloaderTest extends \PHPUnit_Framework_TestCase
             ->will($this->returnValue(0));
 
         $downloader = $this->getDownloaderMock(null, null, $processExecutor);
-        $downloader->update($packageMock, $packageMock, $tmpDir);
+        $downloader->update($packageMock, $packageMock, $this->workingDir);
     }
 
     public function testRemove()
diff --git a/tests/Composer/Test/Downloader/PerforceDownloaderTest.php b/tests/Composer/Test/Downloader/PerforceDownloaderTest.php
index 2c113b5ae..fc4297633 100644
--- a/tests/Composer/Test/Downloader/PerforceDownloaderTest.php
+++ b/tests/Composer/Test/Downloader/PerforceDownloaderTest.php
@@ -16,6 +16,7 @@ use Composer\Downloader\PerforceDownloader;
 use Composer\Config;
 use Composer\Repository\VcsRepository;
 use Composer\IO\IOInterface;
+use Composer\Util\Filesystem;
 
 /**
  * @author Matt Whittom <Matt.Whittom@veteransunited.com>
@@ -51,7 +52,10 @@ class PerforceDownloaderTest extends \PHPUnit_Framework_TestCase
         $this->io         = null;
         $this->config     = null;
         $this->repoConfig = null;
-        $this->testPath   = null;
+        if (is_dir($this->testPath)) {
+            $fs = new Filesystem;
+            $fs->removeDirectory($this->testPath);
+        }
     }
 
     protected function getMockProcessExecutor()
diff --git a/tests/Composer/Test/Downloader/XzDownloaderTest.php b/tests/Composer/Test/Downloader/XzDownloaderTest.php
index 02e6701a0..2acc7b4d0 100644
--- a/tests/Composer/Test/Downloader/XzDownloaderTest.php
+++ b/tests/Composer/Test/Downloader/XzDownloaderTest.php
@@ -13,14 +13,32 @@
 namespace Composer\Test\Downloader;
 
 use Composer\Downloader\XzDownloader;
+use Composer\Util\Filesystem;
 
 class XzDownloaderTest extends \PHPUnit_Framework_TestCase
 {
+    /**
+     * @var Filesystem
+     */
+    private $fs;
+
+    /**
+     * @var string
+     */
+    private $testName;
+
     public function setUp()
     {
         if (defined('PHP_WINDOWS_VERSION_BUILD')) {
             $this->markTestSkipped('Skip test on Windows');
         }
+        $this->testName = sys_get_temp_dir().'/composer-xz-test-vendor';
+    }
+
+    public function tearDown()
+    {
+        $this->fs = new Filesystem;
+        $this->fs->removeDirectory($this->testName);
     }
 
     public function testErrorMessages()
@@ -44,7 +62,7 @@ class XzDownloaderTest extends \PHPUnit_Framework_TestCase
         $config->expects($this->any())
             ->method('get')
             ->with('vendor-dir')
-            ->will($this->returnValue(sys_get_temp_dir().'/composer-xz-test-vendor'));
+            ->will($this->returnValue($this->testName));
         $downloader = new XzDownloader($io, $config);
 
         try {
diff --git a/tests/Composer/Test/Downloader/ZipDownloaderTest.php b/tests/Composer/Test/Downloader/ZipDownloaderTest.php
index 58e0078b0..25a95ace6 100644
--- a/tests/Composer/Test/Downloader/ZipDownloaderTest.php
+++ b/tests/Composer/Test/Downloader/ZipDownloaderTest.php
@@ -13,14 +13,28 @@
 namespace Composer\Test\Downloader;
 
 use Composer\Downloader\ZipDownloader;
+use Composer\Util\Filesystem;
 
 class ZipDownloaderTest extends \PHPUnit_Framework_TestCase
 {
+
+    /**
+     * @var string
+     */
+    private $testDir;
+
     public function setUp()
     {
         if (!class_exists('ZipArchive')) {
             $this->markTestSkipped('zip extension missing');
         }
+        $this->testDir = sys_get_temp_dir().'/composer-zip-test-vendor';
+    }
+
+    public function tearDown()
+    {
+        $fs = new Filesystem;
+        $fs->removeDirectory($this->testDir);
     }
 
     public function testErrorMessages()
@@ -44,7 +58,7 @@ class ZipDownloaderTest extends \PHPUnit_Framework_TestCase
         $config->expects($this->any())
             ->method('get')
             ->with('vendor-dir')
-            ->will($this->returnValue(sys_get_temp_dir().'/composer-zip-test-vendor'));
+            ->will($this->returnValue($this->testDir));
         $downloader = new ZipDownloader($io, $config);
 
         try {
diff --git a/tests/Composer/Test/Util/FilesystemTest.php b/tests/Composer/Test/Util/FilesystemTest.php
index 4607512b6..d7c986369 100644
--- a/tests/Composer/Test/Util/FilesystemTest.php
+++ b/tests/Composer/Test/Util/FilesystemTest.php
@@ -17,6 +17,21 @@ use Composer\TestCase;
 
 class FilesystemTest extends TestCase
 {
+    /**
+     * @var Filesystem
+     */
+    private $fs;
+
+    /**
+     * @var string
+     */
+    private $workingDir;
+
+    /**
+     * @var string
+     */
+    private $testFile;
+
     /**
      * @dataProvider providePathCouplesAsCode
      */
@@ -26,6 +41,23 @@ class FilesystemTest extends TestCase
         $this->assertEquals($expected, $fs->findShortestPathCode($a, $b, $directory));
     }
 
+    public function setUp()
+    {
+        $this->fs = new Filesystem;
+        $this->workingDir = sys_get_temp_dir() . '/composer_testdir';
+        $this->testFile = sys_get_temp_dir() . '/composer_test_file';
+    }
+
+    public function tearDown()
+    {
+        if (is_dir($this->workingDir)) {
+            $this->fs->removeDirectory($this->workingDir);
+        }
+        if (is_file($this->testFile)) {
+            $this->fs->remove($this->testFile);
+        }
+    }
+
     public function providePathCouplesAsCode()
     {
         return array(
@@ -121,33 +153,30 @@ class FilesystemTest extends TestCase
      */
     public function testRemoveDirectoryPhp()
     {
-        $tmp = sys_get_temp_dir();
-        @mkdir($tmp . "/composer_testdir/level1/level2", 0777, true);
-        file_put_contents($tmp . "/composer_testdir/level1/level2/hello.txt", "hello world");
+        @mkdir($this->workingDir . "/level1/level2", 0777, true);
+        file_put_contents($this->workingDir . "/level1/level2/hello.txt", "hello world");
 
         $fs = new Filesystem;
-        $this->assertTrue($fs->removeDirectoryPhp($tmp . "/composer_testdir"));
-        $this->assertFalse(file_exists($tmp . "/composer_testdir/level1/level2/hello.txt"));
+        $this->assertTrue($fs->removeDirectoryPhp($this->workingDir));
+        $this->assertFalse(file_exists($this->workingDir . "/level1/level2/hello.txt"));
     }
 
     public function testFileSize()
     {
-        $tmp = sys_get_temp_dir();
-        file_put_contents("$tmp/composer_test_file", 'Hello');
+        file_put_contents($this->testFile, 'Hello');
 
         $fs = new Filesystem;
-        $this->assertGreaterThanOrEqual(5, $fs->size("$tmp/composer_test_file"));
+        $this->assertGreaterThanOrEqual(5, $fs->size($this->testFile));
     }
 
     public function testDirectorySize()
     {
-        $tmp = sys_get_temp_dir();
-        @mkdir("$tmp/composer_testdir", 0777, true);
-        file_put_contents("$tmp/composer_testdir/file1.txt", 'Hello');
-        file_put_contents("$tmp/composer_testdir/file2.txt", 'World');
+        @mkdir($this->workingDir, 0777, true);
+        file_put_contents($this->workingDir."/file1.txt", 'Hello');
+        file_put_contents($this->workingDir."/file2.txt", 'World');
 
         $fs = new Filesystem;
-        $this->assertGreaterThanOrEqual(10, $fs->size("$tmp/composer_testdir"));
+        $this->assertGreaterThanOrEqual(10, $fs->size($this->workingDir));
     }
 
     /**
@@ -184,8 +213,7 @@ class FilesystemTest extends TestCase
      */
     public function testUnlinkSymlinkedDirectory()
     {
-        $tmp       = sys_get_temp_dir();
-        $basepath  = $tmp . "/composer_testdir";
+        $basepath  = $this->workingDir;
         $symlinked = $basepath . "/linked";
         @mkdir($basepath . "/real", 0777, true);
         touch($basepath . "/real/FILE");
@@ -212,14 +240,12 @@ class FilesystemTest extends TestCase
      */
     public function testRemoveSymlinkedDirectoryWithTrailingSlash()
     {
-        $tmp = sys_get_temp_dir();
-        $basepath = $tmp . "/composer_testdir";
-        @mkdir($basepath . "/real", 0777, true);
-        touch($basepath . "/real/FILE");
-        $symlinked              = $basepath . "/linked";
+        @mkdir($this->workingDir . "/real", 0777, true);
+        touch($this->workingDir . "/real/FILE");
+        $symlinked              = $this->workingDir . "/linked";
         $symlinkedTrailingSlash = $symlinked . "/";
 
-        $result = @symlink($basepath . "/real", $symlinked);
+        $result = @symlink($this->workingDir . "/real", $symlinked);
 
         if (!$result) {
             $this->markTestSkipped('Symbolic links for directories not supported on this platform');