Merge pull request KathanP19#232 from anmolksachan/patch-1

Update GraphQL.md

Author: KathanP19

GraphQL/GraphQL.md

@@ -9,6 +9,7 @@
 - [Reverse engineer a GraphQL API](https://swizec.com/blog/reverse-engineer-a-graphql-api-to-automate-love-notes-codewithswiz-24)
 - [Exploiting GraphQL](https://blog.assetnote.io/2021/08/29/exploiting-graphql/) by [Assetnote](https://assetnote.io/)
 - [GraphQL Resources Thread](https://twitter.com/holybugx/status/1441460070387261440?s=21) by [HolyBugx](https://twitter.com/HolyBugx)
+- [GraphQL Test Cases](https://anmolksachan.github.io/graphql/)
 
 # Tools
 - [GraphQL Voyager](https://apis.guru/graphql-voyager/)