Speed up installer tests by avoiding lots of bootstrapping and git processes

src/Composer/Factory.php

@@ -356,7 +356,7 @@ class Factory
         // load package
         $parser = new VersionParser;
         $guesser = new VersionGuesser($config, $process, $parser);
-        $loader = new Package\Loader\RootPackageLoader($rm, $config, $parser, $guesser, $io);
+        $loader = $this->loadRootPackage($rm, $config, $parser, $guesser, $io);
         $package = $loader->load($localConfig, 'Composer\Package\RootPackage', $cwd);
         $composer->setPackage($package);
 
@@ -567,6 +567,11 @@ class Factory
         }
     }
 
+    protected function loadRootPackage(RepositoryManager $rm, Config $config, VersionParser $parser, VersionGuesser $guesser, IOInterface $io)
+    {
+        return new Package\Loader\RootPackageLoader($rm, $config, $parser, $guesser, $io);
+    }
+
     /**
      * @param  IOInterface $io             IO instance
      * @param  mixed       $config         either a configuration array or a filename to read from, if null it will read from

tests/Composer/Test/Fixtures/installer/install-dev-using-dist.test

@@ -26,7 +26,7 @@ Installs a dev package from lock using dist
     "minimum-stability": "dev"
 }
 --RUN--
-install --prefer-dist
+install
 --EXPECT-LOCK--
 {
     "packages": [

tests/Composer/Test/InstallerTest.php

@@ -14,7 +14,10 @@ namespace Composer\Test;
 
 use Composer\DependencyResolver\Request;
 use Composer\Installer;
-use Composer\Console\Application;
+use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputOption;
 use Composer\IO\BufferIO;
 use Composer\Json\JsonFile;
 use Composer\Package\Dumper\ArrayDumper;
@@ -263,7 +266,12 @@ class InstallerTest extends TestCase
         $installer = Installer::create($io, $composer);
 
         $application = new Application;
-        $application->get('install')->setCode(function ($input, $output) use ($installer) {
+        $install = new Command('install');
+        $install->addOption('ignore-platform-reqs', null, InputOption::VALUE_NONE);
+        $install->addOption('ignore-platform-req', null, InputOption::VALUE_REQUIRED | InputOption::VALUE_IS_ARRAY);
+        $install->addOption('no-dev', null, InputOption::VALUE_NONE);
+        $install->addOption('dry-run', null, InputOption::VALUE_NONE);
+        $install->setCode(function ($input, $output) use ($installer) {
             $ignorePlatformReqs = $input->getOption('ignore-platform-reqs') ?: ($input->getOption('ignore-platform-req') ?: false);
 
             $installer
@@ -273,8 +281,21 @@ class InstallerTest extends TestCase
 
             return $installer->run();
         });
+        $application->add($install);
 
-        $application->get('update')->setCode(function ($input, $output) use ($installer) {
+        $update = new Command('update');
+        $update->addOption('ignore-platform-reqs', null, InputOption::VALUE_NONE);
+        $update->addOption('ignore-platform-req', null, InputOption::VALUE_REQUIRED | InputOption::VALUE_IS_ARRAY);
+        $update->addOption('no-dev', null, InputOption::VALUE_NONE);
+        $update->addOption('no-install', null, InputOption::VALUE_NONE);
+        $update->addOption('dry-run', null, InputOption::VALUE_NONE);
+        $update->addOption('lock', null, InputOption::VALUE_NONE);
+        $update->addOption('with-all-dependencies', null, InputOption::VALUE_NONE);
+        $update->addOption('with-dependencies', null, InputOption::VALUE_NONE);
+        $update->addOption('prefer-stable', null, InputOption::VALUE_NONE);
+        $update->addOption('prefer-lowest', null, InputOption::VALUE_NONE);
+        $update->addArgument('packages', InputArgument::IS_ARRAY | InputArgument::OPTIONAL);
+        $update->setCode(function ($input, $output) use ($installer) {
             $packages = $input->getArgument('packages');
             $filteredPackages = array_filter($packages, function ($package) {
                 return !in_array($package, array('lock', 'nothing', 'mirrors'), true);
@@ -305,6 +326,7 @@ class InstallerTest extends TestCase
 
             return $installer->run();
         });
+        $application->add($update);
 
         if (!preg_match('{^(install|update)\b}', $run)) {
             throw new \UnexpectedValueException('The run command only supports install and update');

tests/Composer/Test/Mock/FactoryMock.php

@@ -17,6 +17,8 @@ use Composer\Config;
 use Composer\Factory;
 use Composer\Repository\RepositoryManager;
 use Composer\Repository\WritableRepositoryInterface;
+use Composer\Package\Version\VersionGuesser;
+use Composer\Package\Version\VersionParser;
 use Composer\Package\RootPackageInterface;
 use Composer\Installer;
 use Composer\EventDispatcher\EventDispatcher;
@@ -39,6 +41,11 @@ class FactoryMock extends Factory
         return $config;
     }
 
+    protected function loadRootPackage(RepositoryManager $rm, Config $config, VersionParser $parser, VersionGuesser $guesser, IOInterface $io)
+    {
+        return new \Composer\Package\Loader\RootPackageLoader($rm, $config, $parser, new VersionGuesserMock(), $io);
+    }
+
     protected function addLocalRepository(IOInterface $io, RepositoryManager $rm, $vendorDir, RootPackageInterface $rootPackage)
     {
     }