minor symfony#46908 [Mime] ignore the cached body when comparing e-mails for equality (xabbuh)

This PR was merged into the 4.4 branch.

Discussion
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[Mime]  ignore the cached body when comparing e-mails for equality

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | symfony#46863 (comment)
| License       | MIT
| Doc PR        |

Commits
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bebdd61 ignore the cached body when comparing e-mails for equality

Author: fabpot

src/Symfony/Component/Mime/Tests/MessageConverterTest.php

@@ -76,6 +76,12 @@ private function assertConversion(Email $expected)
             $expected->html('HTML content');
             $converted->html('HTML content');
         }
+
+        $r = new \ReflectionProperty($expected, 'cachedBody');
+        $r->setAccessible(true);
+        $r->setValue($expected, null);
+        $r->setValue($converted, null);
+
         $this->assertEquals($expected, $converted);
     }
 }