Not sure about this, but try to set the email subject in your Mailable to 'Hello' and provide the new results. I think that the test tries to validate that the email was sent AND that the subject of the email was set to 'Hello'.
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Not sure about this, but try to set the email subject in your Mailable to 'Hello' and provide the new results. I think that the test tries to validate that the email was sent AND that the subject of the email was set to 'Hello'.