Fix AES tests for helpers (#122)

CHANGELOG.md

@@ -10,6 +10,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `ManualAttachmentProcessor`: a new kind of attachment processor where the caller has to first allocate a buffer large enough for the whole data packet to be written to. It can be created with 
 ```processor, err := keyRing.NewManualAttachmentProcessor(estimatedSize, filename, dataBuffer)```.
 
+### Fixed
+- Fix random failure in AES tests
+
 ### Changed
 - Updated the x/mobile fork and the build script to work with golang 1.16
 

helper/helper_test.go

@@ -18,8 +18,7 @@ func TestAESEncryption(t *testing.T) {
 	}
 
 	_, err = DecryptMessageWithPassword([]byte("Wrong passphrase"), ciphertext)
-	assert.EqualError(t, err, "gopenpgp: unable to decrypt message with password: "+
-		"gopenpgp: error in reading password protected message: gopenpgp: wrong password in symmetric decryption")
+	assert.NotNil(t, err)
 
 	decrypted, err := DecryptMessageWithPassword(passphrase, ciphertext)
 	if err != nil {