Don't use deprecated Email class in EmailTraitTest.

src/Mailer/Mailer.php

@@ -324,7 +324,7 @@ class Mailer implements EventListenerInterface
     /**
      * Send email directly without using a mailer action.
      *
-     * @param string $content
+     * @param string $content Content.
      * @return array{headers: string, message: string}
      */
     public function deliver(string $content = '')

tests/TestCase/TestSuite/EmailTraitTest.php

@@ -16,7 +16,8 @@ declare(strict_types=1);
  */
 namespace Cake\Test\TestCase\TestSuite;
 
-use Cake\Mailer\Email;
+use Cake\Mailer\Mailer;
+use Cake\Mailer\Message;
 use Cake\Mailer\TransportFactory;
 use Cake\TestSuite\EmailTrait;
 use Cake\TestSuite\TestCase;
@@ -39,14 +40,14 @@ class EmailTraitTest extends TestCase
     {
         parent::setUp();
 
-        Email::drop('default');
-        Email::drop('alternate');
+        Mailer::drop('default');
+        Mailer::drop('alternate');
 
-        Email::setConfig('default', [
+        Mailer::setConfig('default', [
             'transport' => 'test_tools',
             'from' => 'default@example.com',
         ]);
-        Email::setConfig('alternate', [
+        Mailer::setConfig('alternate', [
             'transport' => 'test_tools',
             'from' => 'alternate@example.com',
         ]);
@@ -64,8 +65,8 @@ class EmailTraitTest extends TestCase
     {
         parent::tearDown();
 
-        Email::drop('default');
-        Email::drop('alternate');
+        Mailer::drop('default');
+        Mailer::drop('alternate');
         TransportFactory::drop('test_tools');
     }
 
@@ -171,10 +172,10 @@ class EmailTraitTest extends TestCase
      */
     public function testAssertUsingRegExpCharacters()
     {
-        (new Email())
+        (new Mailer())
             ->setTo('to3@example.com')
             ->setCc('cc3@example.com')
-            ->send('email with regexp chars $/[]');
+            ->deliver('email with regexp chars $/[]');
 
         $this->assertMailContains('$/[]');
     }
@@ -227,20 +228,20 @@ class EmailTraitTest extends TestCase
      */
     private function sendEmails()
     {
-        (new Email())
+        (new Mailer())
             ->setTo(['to@example.com' => 'Foo Bar'])
             ->addTo('alsoto@example.com')
             ->setCc('cc@example.com')
             ->setBcc(['bcc@example.com' => 'Baz Qux'])
             ->setSubject('Hello world')
             ->setAttachments(['custom_name.php' => CAKE . 'basics.php'])
-            ->setEmailFormat(Email::MESSAGE_TEXT)
-            ->send('text');
+            ->setEmailFormat(Message::MESSAGE_TEXT)
+            ->deliver('text');
 
-        (new Email('alternate'))
+        (new Mailer('alternate'))
             ->setTo('to2@example.com')
             ->setCc('cc2@example.com')
-            ->setEmailFormat(Email::MESSAGE_HTML)
-            ->send('html');
+            ->setEmailFormat(Message::MESSAGE_HTML)
+            ->deliver('html');
     }
 }