switch error str tests to in (#22016)

Author: iscai-msft

sdk/storage/azure-storage-queue/tests/test_queue_encryption.py

@@ -343,7 +343,7 @@ def test_missing_attribute_kek_unrwap(self, storage_account_name, storage_accoun
         with self.assertRaises(HttpResponseError) as e:
             queue.peek_messages()
 
-        self.assertEqual(str(e.exception), "Decryption failed.")
+        assert "Decryption failed." in str(e.exception)
 
         invalid_key_2 = lambda: None  # functions are objects, so this effectively creates an empty object
         invalid_key_2.get_kid = valid_key.get_kid
@@ -473,7 +473,7 @@ def test_encryption_nonmatching_kid(self, storage_account_name, storage_account_
         with self.assertRaises(HttpResponseError) as e:
             next(queue.receive_messages())
 
-        self.assertEqual(str(e.exception), "Decryption failed.")
+        assert "Decryption failed." in str(e.exception)
 
 
 # ------------------------------------------------------------------------------

sdk/storage/azure-storage-queue/tests/test_queue_encryption_async.py

@@ -383,7 +383,7 @@ async def test_missing_attribute_kek_unrwap(self, storage_account_name, storage_
         with self.assertRaises(HttpResponseError) as e:
             await queue.peek_messages()
 
-        self.assertEqual(str(e.exception), "Decryption failed.")
+        assert "Decryption failed." in str(e.exception)
 
         invalid_key_2 = lambda: None  # functions are objects, so this effectively creates an empty object
         invalid_key_2.get_kid = valid_key.get_kid
@@ -522,7 +522,7 @@ async def test_encryption_nonmatching_kid(self, storage_account_name, storage_ac
             async for m in queue.receive_messages():
                 messages.append(m)
 
-        self.assertEqual(str(e.exception), "Decryption failed.")
+        assert "Decryption failed." in str(e.exception)
 
 # ------------------------------------------------------------------------------
 if __name__ == '__main__':