Test for detached heads yielding an invalid version

tests/Composer/Test/Package/Loader/RootPackageLoaderTest.php

@@ -0,0 +1,48 @@
+<?php
+
+/*
+ * This file is part of Composer.
+ *
+ * (c) Nils Adermann <naderman@naderman.de>
+ *     Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Composer\Test\Package\Loader;
+
+use Composer\Package\Loader\RootPackageLoader;
+use Composer\Test\Mock\ProcessExecutorMock;
+
+class RootPackageLoaderTest extends \PHPUnit_Framework_TestCase
+{
+    public function testDetachedHeadBecomesDevHash()
+    {
+        if (!function_exists('proc_open')) {
+            $this->markTestSkipped('proc_open() is not available');
+        }
+
+        $commitHash = '03a15d220da53c52eddd5f32ffca64a7b3801bea';
+
+        $manager = $this->getMockBuilder('\\Composer\\Repository\\RepositoryManager')
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $self = $this;
+
+        /* Can do away with this mock object when https://github.com/sebastianbergmann/phpunit-mock-objects/issues/81 is fixed */
+        $processExecutor = new ProcessExecutorMock(function($command, &$output = null, $cwd = null) use ($self, $commitHash) {
+            $self->assertStringStartsWith('git branch', $command);
+
+            $output = "* (no branch) $commitHash Commit message\n";
+
+            return 0;
+        });
+
+        $loader = new RootPackageLoader($manager, null, $processExecutor);
+        $package = $loader->load(array());
+
+        $this->assertEquals("dev-$commitHash", $package->getVersion());
+    }
+}