diff --git a/src/Compiler/CoreInitializationPass.php b/src/Compiler/CoreInitializationPass.php
index 3b58c87..a28ca9e 100644
--- a/src/Compiler/CoreInitializationPass.php
+++ b/src/Compiler/CoreInitializationPass.php
@@ -2,7 +2,13 @@
 
 namespace SilverStripe\BehatExtension\Compiler;
 
+use SilverStripe\Control\CLIRequestBuilder;
+use SilverStripe\Control\Controller;
+use SilverStripe\Control\HTTPApplication;
+use SilverStripe\Control\HTTPRequest;
+use SilverStripe\Core\CoreKernel;
 use SilverStripe\Core\Manifest\ModuleLoader;
+use SilverStripe\ORM\DataObject;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 
@@ -18,12 +24,13 @@ class CoreInitializationPass implements CompilerPassInterface
      */
     public function process(ContainerBuilder $container)
     {
+        // Note: Moved from SilverStripeAwareInitializer
+        file_put_contents('php://stdout', 'Bootstrapping' . PHP_EOL);
+
         // Connect to database and build manifest
-        $_GET['flush'] = 1;
         if (!getenv('SS_ENVIRONMENT_TYPE')) {
             putenv('SS_ENVIRONMENT_TYPE=dev');
         }
-        require_once('Core/Core.php');
 
         // Include bootstrap file
         $bootstrapFile = $container->getParameter('silverstripe_extension.bootstrap_file');
@@ -31,6 +38,25 @@ class CoreInitializationPass implements CompilerPassInterface
             require_once $bootstrapFile;
         }
 
+        // Copied from SapphireTest
+        $request = CLIRequestBuilder::createFromEnvironment();
+        $kernel = new CoreKernel(BASE_PATH);
+        $app = new HTTPApplication($kernel);
+        $app->execute($request, function (HTTPRequest $request) {
+            // Start session and execute
+            $request->getSession()->init();
+
+            // Invalidate classname spec since the test manifest will now pull out new subclasses for each internal class
+            // (e.g. Member will now have various subclasses of DataObjects that implement TestOnly)
+            DataObject::reset();
+
+            // Set dummy controller;
+            $controller = Controller::create();
+            $controller->setRequest($request);
+            $controller->pushCurrent();
+            $controller->doInit();
+        }, true);
+
         // Register all paths
         foreach (ModuleLoader::inst()->getManifest()->getModules() as $module) {
             $container->setParameter('paths.modules.'.$module->getShortName(), $module->getPath());
@@ -41,8 +67,6 @@ class CoreInitializationPass implements CompilerPassInterface
             }
         }
 
-        unset($_GET['flush']);
-
         // Remove the error handler so that PHPUnit can add its own
         restore_error_handler();
     }
diff --git a/src/Context/FixtureContext.php b/src/Context/FixtureContext.php
index 1b55843..bb4c896 100644
--- a/src/Context/FixtureContext.php
+++ b/src/Context/FixtureContext.php
@@ -18,6 +18,7 @@ use SilverStripe\Dev\FixtureBlueprint;
 use SilverStripe\Dev\FixtureFactory;
 use SilverStripe\Dev\SapphireTest;
 use SilverStripe\Dev\YamlFixture;
+use SilverStripe\ORM\Connect\TempDatabase;
 use SilverStripe\ORM\DB;
 use SilverStripe\ORM\DataObject;
 use SilverStripe\Versioned\Versioned;
@@ -46,6 +47,13 @@ class FixtureContext implements Context
      */
     protected $filesPath;
 
+    /**
+     * Temp database helper
+     *
+     * @var TempDatabase
+     */
+    protected $tempDatabase;
+
     /**
      * @var String Tracks all files and folders created from fixtures, for later cleanup.
      */
@@ -66,6 +74,7 @@ class FixtureContext implements Context
             throw new InvalidArgumentException("filesPath is required");
         }
         $this->setFilesPath($filesPath);
+        $this->setTempDatabase(new TempDatabase());
     }
 
     /**
@@ -125,6 +134,24 @@ class FixtureContext implements Context
         return $this->filesPath;
     }
 
+    /**
+     * @return TempDatabase
+     */
+    public function getTempDatabase()
+    {
+        return $this->tempDatabase;
+    }
+
+    /**
+     * @param TempDatabase $database
+     * @return $this
+     */
+    public function setTempDatabase(TempDatabase $database)
+    {
+        $this->tempDatabase = $database;
+        return $this;
+    }
+
     /**
      * @BeforeScenario @database-defaults
      *
@@ -132,7 +159,7 @@ class FixtureContext implements Context
      */
     public function beforeDatabaseDefaults(BeforeScenarioScope $event)
     {
-        SapphireTest::empty_temp_db();
+        $this->getTempDatabase()->clearAllData();
         DB::get_conn()->quiet();
         $dataClasses = ClassInfo::subclassesFor(DataObject::class);
         array_shift($dataClasses);
@@ -147,7 +174,7 @@ class FixtureContext implements Context
      */
     public function afterResetDatabase(AfterScenarioScope $event)
     {
-        SapphireTest::empty_temp_db();
+        $this->getTempDatabase()->clearAllData();
     }
 
     /**
diff --git a/src/Context/Initializer/SilverStripeAwareInitializer.php b/src/Context/Initializer/SilverStripeAwareInitializer.php
index 0dd4ac0..20e522a 100644
--- a/src/Context/Initializer/SilverStripeAwareInitializer.php
+++ b/src/Context/Initializer/SilverStripeAwareInitializer.php
@@ -65,13 +65,6 @@ class SilverStripeAwareInitializer implements ContextInitializer
      */
     public function __construct()
     {
-        file_put_contents('php://stdout', 'Bootstrapping' . PHP_EOL);
-
-        SapphireTest::start();
-
-        // Remove the error handler so that PHPUnit can add its own
-        restore_error_handler();
-
         file_put_contents('php://stdout', "Creating test session environment" . PHP_EOL);
 
         $testEnv = TestSessionEnvironment::singleton();