public function testSendHTML()
{
// Set custom $project - used in email headers
global $project;
$oldProject = $project;
$project = 'emailtest';
Injector::inst()->registerService(new EmailTest_Mailer(), 'SilverStripe\\Control\\Email\\Mailer');
$email = new Email('*****@*****.**', '*****@*****.**', 'Test send plain', 'Testing Email->send()', null, '*****@*****.**', '*****@*****.**');
$email->attachFile(__DIR__ . '/fixtures/attachment.txt', null, 'text/plain');
$email->addCustomHeader('foo', 'bar');
$sent = $email->send(123);
// Restore old project name after sending
$project = $oldProject;
$this->assertEquals('*****@*****.**', $sent['to']);
$this->assertEquals('*****@*****.**', $sent['from']);
$this->assertEquals('Test send plain', $sent['subject']);
$this->assertContains('Testing Email->send()', $sent['content']);
$this->assertNull($sent['plaincontent']);
$this->assertEquals(array(0 => array('contents' => 'Hello, I\'m a text document.', 'filename' => 'attachment.txt', 'mimetype' => 'text/plain')), $sent['files']);
$this->assertEquals(array('foo' => 'bar', 'X-SilverStripeMessageID' => 'emailtest.123', 'X-SilverStripeSite' => 'emailtest', 'Cc' => '*****@*****.**', 'Bcc' => '*****@*****.**'), $sent['customheaders']);
}