diff --git a/tests/Composer/Test/Functional/AllFunctionalTest.php b/tests/Composer/Test/Functional/AllFunctionalTest.php
new file mode 100755
index 000000000..7ad615947
--- /dev/null
+++ b/tests/Composer/Test/Functional/AllFunctionalTest.php
@@ -0,0 +1,125 @@
+<?php
+
+namespace Composer\Test\Functional;
+
+use Symfony\Component\Process\Process;
+use Composer\Util\Filesystem;
+use Symfony\Component\Finder\Finder;
+
+class AllFunctionalTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @dataProvider getTestFiles
+     */
+    public function testIntegration(\SplFileInfo $testFile)
+    {
+        $testData = $this->parseTestFile($testFile);
+
+        $cmd = 'php '.__DIR__.'/../../../../bin/composer '.$testData['command'];
+        $proc = new Process($cmd);
+        $exitcode = $proc->run();
+
+        if (isset($testData['output'])) {
+            $this->assertEquals($testData['output'], $proc->getOutput());
+        }
+        if (isset($testData['outputregex'])) {
+            $this->assertRegExp($testData['outputregex'], $proc->getOutput());
+        }
+        if (isset($testData['erroroutput'])) {
+            $this->assertEquals($testData['erroroutput'], $proc->getErrorOutput());
+        }
+        if (isset($testData['erroroutputregex'])) {
+            $this->assertRegExp($testData['erroroutputregex'], $proc->getErrorOutput());
+        }
+        if (isset($testData['exitcode'])) {
+            $this->assertSame($testData['exitcode'], $exitcode);
+        }
+
+        // Clean up.
+        $fs = new Filesystem();
+        if (isset($testData['test_dir']) && is_dir($testData['test_dir'])) {
+            $fs->removeDirectory($testData['test_dir']);
+        }
+    }
+
+    public function getTestFiles()
+    {
+        $tests = array();
+        foreach (Finder::create()->in(__DIR__)->name('*.test')->files() as $file) {
+            $tests[] = array($file);
+        }
+
+        return $tests;
+    }
+
+    private function parseTestFile(\SplFileInfo $file)
+    {
+        $tokens = preg_split('#(?:^|\n\n)-- ([a-zA-Z]+) --\n#', file_get_contents($file->getRealPath()), null, PREG_SPLIT_DELIM_CAPTURE);
+        $data = array();
+        $section = null;
+
+        $varRegex = '#%([^%]+)%#';
+        $variableReplacer = function($match) use (&$data) {
+            list(, $var) = $match;
+
+            switch ($var) {
+                case 'testDir':
+                    $testDir = sys_get_temp_dir().'/composer_functional_test'.uniqid(mt_rand(), true);
+                    $data['test_dir'] = $testDir;
+
+                    return $testDir;
+
+                default:
+                    throw new \InvalidArgumentException(sprintf('Unknown variable "%s". Supported variables: "testDir"', $var));
+            }
+        };
+
+        for ($i=0,$c=count($tokens); $i<$c; $i++) {
+            if ('' === $tokens[$i] && null === $section) {
+                continue;
+            }
+
+            // Handle section headers.
+            if (null === $section) {
+                $section = strtolower($tokens[$i]);
+                continue;
+            }
+
+            $sectionData = $tokens[$i];
+
+            // Allow sections to validate, or modify their section data.
+            switch ($section) {
+                case 'command':
+                    $sectionData = preg_replace_callback($varRegex, $variableReplacer, $sectionData);
+                    break;
+
+                case 'exitcode':
+                    $sectionData = (integer) $sectionData;
+
+                case 'erroroutputregex':
+                case 'outputregex':
+                case 'erroroutput':
+                case 'output':
+                    $sectionData = preg_replace_callback($varRegex, $variableReplacer, $sectionData);
+                    break;
+
+                default:
+                    throw new \RuntimeException(sprintf('Unknown section "%s". Allowed sections: "command", "output", "erroroutput", "exitcode", "outputregex", "erroroutputregex". '
+                                                       .'Section headers must be written as "-- HEADER_NAME --" and be preceded by an empty line if not at the start of the file.', $section));
+            }
+
+            $data[$section] = $sectionData;
+            $section = $sectionData = null;
+        }
+
+        // validate data
+        if (!isset($data['command'])) {
+            throw new \RuntimeException('The test file must have a section named "COMMAND".');
+        }
+        if (!isset($data['output']) && !isset($data['erroroutput']) && !isset($data['outputregex']) && !isset($data['erroroutputregex'])) {
+            throw new \RuntimeException('The test file must have a section named "OUTPUT", "ERROROUTPUT", "OUTPUTREGEX", or "ERROROUTPUTREGEX".');
+        }
+
+        return $data;
+    }
+}
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