test: replacing snapshot tests with RTL tests part 16 (#2252)

src/generic/hooks/tests/hooks.test.tsx

@@ -1,18 +1,13 @@
 import React from 'react';
 import { getConfig } from '@edx/frontend-platform';
 import { act, renderHook } from '@testing-library/react';
-import { useKeyedState } from '@edx/react-unit-test-utils';
 import { logError } from '@edx/frontend-platform/logging';
-import { iframeMessageTypes, iframeStateKeys } from '../../../constants';
-import { useIframeBehavior } from '../useIframeBehavior';
+import { iframeMessageTypes } from '../../../constants';
+import { useIframeBehavior, iframeBehaviorState } from '../useIframeBehavior';
 import { useLoadBearingHook } from '../useLoadBearingHook';
 
 jest.useFakeTimers();
 
-jest.mock('@edx/react-unit-test-utils', () => ({
-  useKeyedState: jest.fn(),
-}));
-
 jest.mock('@edx/frontend-platform/logging', () => ({
   logError: jest.fn(),
 }));
@@ -27,20 +22,10 @@ describe('useIframeBehavior', () => {
   const iframeRef = { current: { contentWindow: null } as HTMLIFrameElement };
 
   beforeEach(() => {
-    (useKeyedState as jest.Mock).mockImplementation((key, initialValue) => {
-      switch (key) {
-        case iframeStateKeys.iframeHeight:
-          return [0, setIframeHeight];
-        case iframeStateKeys.hasLoaded:
-          return [false, setHasLoaded];
-        case iframeStateKeys.showError:
-          return [false, setShowError];
-        case iframeStateKeys.windowTopOffset:
-          return [null, setWindowTopOffset];
-        default:
-          return [initialValue, jest.fn()];
-      }
-    });
+    jest.spyOn(iframeBehaviorState, 'iframeHeight').mockImplementation(() => [0, setIframeHeight]);
+    jest.spyOn(iframeBehaviorState, 'hasLoaded').mockImplementation(() => [false, setHasLoaded]);
+    jest.spyOn(iframeBehaviorState, 'showError').mockImplementation(() => [false, setShowError]);
+    jest.spyOn(iframeBehaviorState, 'windowTopOffset').mockImplementation(() => [null, setWindowTopOffset]);
 
     window.scrollTo = jest.fn((x: number | ScrollToOptions, y?: number): void => {
       const scrollY = typeof x === 'number' ? y : (x as ScrollToOptions).top || 0;
@@ -58,14 +43,7 @@ describe('useIframeBehavior', () => {
 
   it('scrolls to previous position on video fullscreen exit', () => {
     const mockWindowTopOffset = 100;
-
-    (useKeyedState as jest.Mock).mockImplementation((key) => {
-      if (key === iframeStateKeys.windowTopOffset) {
-        return [mockWindowTopOffset, setWindowTopOffset];
-      }
-      return [null, jest.fn()];
-    });
-
+    jest.spyOn(iframeBehaviorState, 'windowTopOffset').mockImplementation(() => [mockWindowTopOffset, setWindowTopOffset]);
     renderHook(() => useIframeBehavior({ id, iframeUrl, iframeRef }));
 
     const message = {

src/generic/hooks/useIframeBehavior.tsx

@@ -1,13 +1,24 @@
-import { useCallback, useEffect } from 'react';
+import { useCallback, useEffect, useState } from 'react';
 import { logError } from '@edx/frontend-platform/logging';
-// eslint-disable-next-line import/no-extraneous-dependencies
-import { useKeyedState } from '@edx/react-unit-test-utils';
-
+import StrictDict from '@src/editors/utils/StrictDict';
 import { useLoadBearingHook } from './useLoadBearingHook';
-import { iframeStateKeys, iframeMessageTypes } from '../../constants';
+import { iframeMessageTypes } from '../../constants';
 import { UseIFrameBehaviorReturnTypes, UseIFrameBehaviorTypes } from '../types';
 import { useEventListener } from './useEventListener';
 
+/**
+ * Internal state hooks for useIFrameBehavior.
+ * Defined and exported here so they can be mocked/manipulated in tests.
+ */
+export const iframeBehaviorState = StrictDict({
+  /* eslint-disable react-hooks/rules-of-hooks */
+  iframeHeight: (val) => useState<number>(val),
+  hasLoaded: (val) => useState<boolean>(val),
+  showError: (val) => useState<boolean>(val),
+  windowTopOffset: (val) => useState<number | null>(val),
+  /* eslint-enable react-hooks/rules-of-hooks */
+});
+
 /**
  * Custom hook to manage iframe behavior.
  *
@@ -31,10 +42,10 @@ export const useIframeBehavior = ({
   // Do not remove this hook.  See function description.
   useLoadBearingHook(id);
 
-  const [iframeHeight, setIframeHeight] = useKeyedState<number>(iframeStateKeys.iframeHeight, 0);
-  const [hasLoaded, setHasLoaded] = useKeyedState<boolean>(iframeStateKeys.hasLoaded, false);
-  const [showError, setShowError] = useKeyedState<boolean>(iframeStateKeys.showError, false);
-  const [windowTopOffset, setWindowTopOffset] = useKeyedState<number | null>(iframeStateKeys.windowTopOffset, null);
+  const [iframeHeight, setIframeHeight] = iframeBehaviorState.iframeHeight(0);
+  const [hasLoaded, setHasLoaded] = iframeBehaviorState.hasLoaded(false);
+  const [showError, setShowError] = iframeBehaviorState.showError(false);
+  const [windowTopOffset, setWindowTopOffset] = iframeBehaviorState.windowTopOffset(null);
 
   const receiveMessage = useCallback((event: MessageEvent) => {
     if (!iframeRef.current || event.source !== iframeRef.current.contentWindow) {