wp_mail(): Lame Test

• So, make a unit test
• But it calls wp_mail()
• But how do we know it really worked?

class LoginTest extends TestCase {
    public function test_notify_login() {
        // Call the plugin's method that generates the mail.
        $actual = self::$o->notify_login($this->user_name);
        $this->assertTrue($actual, 'Bad return value.');
    }
}