Add tests for DefaultFormFactory

src/Forms/DefaultFormFactory.php

@@ -30,6 +30,7 @@ class DefaultFormFactory implements FormFactory
      * @param string $name
      * @param array $context
      * @return Form
+     * @throws InvalidArgumentException When required context is missing
      */
     public function getForm(RequestHandler $controller = null, $name = FormFactory::DEFAULT_NAME, $context = [])
     {

tests/php/Forms/DefaultFormFactoryTest.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace SilverStripe\Forms\Tests;
+
+use InvalidArgumentException;
+use SilverStripe\Dev\SapphireTest;
+use SilverStripe\Forms\DefaultFormFactory;
+use SilverStripe\ORM\DataObject;
+
+class DefaultFormFactoryTest extends SapphireTest
+{
+    /**
+     * @expectedException InvalidArgumentException
+     * @expectedExceptionMessageRegExp /Missing required context/
+     */
+    public function testGetFormThrowsExceptionOnMissingContext()
+    {
+        $factory = new DefaultFormFactory();
+        $factory->getForm();
+    }
+
+    public function testGetForm()
+    {
+        $record = new DataObject();
+        $record->Title = 'Test';
+
+        $factory = new DefaultFormFactory();
+        $form = $factory->getForm(null, null, ['Record' => $record]);
+
+        $this->assertSame($record, $form->getRecord());
+    }
+
+    public function testGetRequiredContext()
+    {
+        $factory = new DefaultFormFactory();
+        $this->assertContains('Record', $factory->getRequiredContext());
+    }
+}