test: add unit test for updateCourseDetailsOverview in scheduleAndDetails slice

Author: bra-i-am

src/schedule-and-details/data/slice.test.js

@@ -0,0 +1,23 @@
+import { reducer, updateCourseDetailsOverview } from './slice';
+
+describe('scheduleAndDetails slice', () => {
+  it('should update courseDetails.overview when updateCourseDetailsOverview is dispatched', () => {
+    const prevState = {
+      loadingDetailsStatus: 'IN_PROGRESS',
+      loadingSettingsStatus: 'IN_PROGRESS',
+      savingStatus: '',
+      courseDetails: {
+        title: 'Intro to Testing',
+        overview: 'Old overview',
+      },
+      courseSettings: {},
+    };
+
+    const newOverview = '<p>New overview HTML content</p>';
+
+    const nextState = reducer(prevState, updateCourseDetailsOverview(newOverview));
+
+    expect(nextState.courseDetails.overview).toEqual(newOverview);
+    expect(nextState.courseDetails.title).toEqual('Intro to Testing');
+  });
+});