feat(utils for creating store for tests): created utility function to create store using reducer

src/utils/createStoreInstanceUsingSliceReducer.ts

+import { AnyAction, Reducer, ThunkMiddleware, configureStore } from '@reduxjs/toolkit';
+import { ToolkitStore } from '@reduxjs/toolkit/dist/configureStore';
+
+export type ToolkitStoreWithSingleSlice<StateType> = ToolkitStore<
+  { [name: string]: StateType },
+  AnyAction,
+  [
+    ThunkMiddleware<
+      {
+        [name: string]: StateType;
+      },
+      AnyAction
+    >,
+  ]
+>;
+
+export type CreateStoreInstanceUsingSliceReducer = <StateType>(
+  name: string,
+  passedReducer: Reducer<StateType>,
+) => ToolkitStoreWithSingleSlice<StateType>;
+
+export const createStoreInstanceUsingSliceReducer: CreateStoreInstanceUsingSliceReducer = (
+  name,
+  passedReducer,
+) =>
+  configureStore({
+    reducer: {
+      [name]: passedReducer,
+    },
+  });