Merge branch 'rishav/addUpdateDeleteTest' of https://github.com/aws/aws-database-encryption-sdk-dynamodb into rishav/addUpdateDeleteTest

Author: rishav-karanjit

TestVectors/dafny/DDBEncryption/src/TestVectors.dfy

@@ -918,7 +918,7 @@ module {:options "-functionSyntax:4"} DdbEncryptionTestVectors {
           var hasDynamoDbEncryptionTransformsException? := String.HasSubString(deleteResult.error.objMessage, "Condition Expressions forbidden on encrypted attributes");
           expect hasDynamoDbEncryptionTransformsException?.Some?, "Error might is not be of type DynamoDbEncryptionTransformsException";
         } else if attributeToDelete in records[i].item && records[i].item[attributeToDelete].S? && records[i].item[attributeToDelete].S == expectedAttributeValue {
-          expect deleteResult.Success?, "DeleteItem should have failed.";
+          expect deleteResult.Success?, "DeleteItem should have succeeded.";
           expect deleteResult.value.Attributes.Some?, "DeleteItemOutput should have had some attribute because ReturnValues was set as `ALL_OLD` in DeleteItemInput";
           expect deleteResult.value.Attributes.value == records[i].item, "Wrong item was deleted.";
         } else {