add mock object (#75)

.eslintrc

@@ -1,10 +1,8 @@
 {
   "extends": [
-    "react-app",
-    "react-app/jest",
     "prettier"
   ],
-  "plugins": ["react", "testing-library", "jest", "prettier"],
+  "plugins": ["testing-library", "jest", "prettier"],
   "rules": {
   }
 }

client/src/__mocks__/QueryClient.mock.js

@@ -0,0 +1,9 @@
+import {QueryClient} from "react-query";
+
+export const queryClientMock = new QueryClient({
+  defaultOptions: {
+    queries: {
+      retry: false,
+    },
+  },
+});