minor #35189 [Mailer] add tests for http transports (azjezz)

This PR was merged into the 4.4 branch.

Discussion
----------

[Mailer] add tests for http transports

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | none
| License       | MIT

Commits
-------

df30a176ac [Mailer] add tests for http transports

Tests/Transport/PostmarkApiTransportTest.php

@@ -12,10 +12,14 @@
 namespace Symfony\Component\Mailer\Bridge\Postmark\Tests\Transport;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpClient\MockHttpClient;
+use Symfony\Component\HttpClient\Response\MockResponse;
 use Symfony\Component\Mailer\Bridge\Postmark\Transport\PostmarkApiTransport;
 use Symfony\Component\Mailer\Envelope;
+use Symfony\Component\Mailer\Exception\HttpTransportException;
 use Symfony\Component\Mime\Address;
 use Symfony\Component\Mime\Email;
+use Symfony\Contracts\HttpClient\ResponseInterface;
 
 class PostmarkApiTransportTest extends TestCase
 {
@@ -61,4 +65,59 @@ public function testCustomHeader()
 
         $this->assertEquals(['Name' => 'foo', 'Value' => 'bar'], $payload['Headers'][0]);
     }
+
+    public function testSend()
+    {
+        $client = new MockHttpClient(function (string $method, string $url, array $options): ResponseInterface {
+            $this->assertSame('POST', $method);
+            $this->assertSame('https://api.postmarkapp.com/email', $url);
+            $this->assertStringContainsStringIgnoringCase('X-Postmark-Server-Token: KEY', $options['headers'][1] ?? $options['request_headers'][1]);
+
+            $body = json_decode($options['body'], true);
+            $this->assertSame('Fabien <fabpot@symfony.com>', $body['From']);
+            $this->assertSame('Saif Eddin <saif.gmati@symfony.com>', $body['To']);
+            $this->assertSame('Hello!', $body['Subject']);
+            $this->assertSame('Hello There!', $body['TextBody']);
+
+            return new MockResponse(json_encode(['MessageID' => 'foobar']), [
+                'http_code' => 200,
+            ]);
+        });
+
+        $transport = new PostmarkApiTransport('KEY', $client);
+
+        $mail = new Email();
+        $mail->subject('Hello!')
+            ->to(new Address('saif.gmati@symfony.com', 'Saif Eddin'))
+            ->from(new Address('fabpot@symfony.com', 'Fabien'))
+            ->text('Hello There!');
+
+        $message = $transport->send($mail);
+
+        $this->assertSame('foobar', $message->getMessageId());
+    }
+
+    public function testSendThrowsForErrorResponse()
+    {
+        $client = new MockHttpClient(static function (string $method, string $url, array $options): ResponseInterface {
+            return new MockResponse(json_encode(['Message' => 'i\'m a teapot', 'ErrorCode' => 418]), [
+                'http_code' => 418,
+                'response_headers' => [
+                    'content-type' => 'application/json',
+                ],
+            ]);
+        });
+        $transport = new PostmarkApiTransport('KEY', $client);
+        $transport->setPort(8984);
+
+        $mail = new Email();
+        $mail->subject('Hello!')
+            ->to(new Address('saif.gmati@symfony.com', 'Saif Eddin'))
+            ->from(new Address('fabpot@symfony.com', 'Fabien'))
+            ->text('Hello There!');
+
+        $this->expectException(HttpTransportException::class);
+        $this->expectExceptionMessage('Unable to send an email: i\'m a teapot (code 418).');
+        $transport->send($mail);
+    }
 }