feat: add more unit tests for code coverage

- add more unit tests for code coverage to cover more use cases
- ignore Modal close in code coverage as our modal does not have close button

src/optimizer-page/CourseOptimizerPage.test.js

@@ -194,7 +194,7 @@ describe('CourseOptimizerPage', () => {
       });
     });
 
-    it('should show only manual links when manualLinks filter is selected', async () => {
+    it('should show only manual links when manualLinks filter is selected and show all links when clicked again', async () => {
       const {
         getByText,
         getByLabelText,
@@ -215,6 +215,16 @@ describe('CourseOptimizerPage', () => {
         expect(queryByText('Test Broken Links')).not.toBeInTheDocument();
         expect(queryByText('Test Locked Links')).not.toBeInTheDocument();
       });
+
+      // Click the manual links checkbox again to clear the filter
+      fireEvent.click(getByLabelText(scanResultsMessages.manualLabel.defaultMessage));
+
+      // Assert that all links are displayed after clearing the filter
+      await waitFor(() => {
+        expect(getByText('Test Broken Links')).toBeInTheDocument();
+        expect(getByText('Test Manual Links')).toBeInTheDocument();
+        expect(getByText('Test Locked Links')).toBeInTheDocument();
+      });
     });
 
     it('should show only manual & locked links when manual & locked Links filters are selected, ignore broken links', async () => {
@@ -267,5 +277,51 @@ describe('CourseOptimizerPage', () => {
         expect(getByText('Test Locked Links')).toBeInTheDocument();
       });
     });
+
+    it('should show only manual links when the broken chip is clicked and show all links when clear filters button is clicked', async () => {
+      const {
+        getByText,
+        getByLabelText,
+        getByTestId,
+        queryByText,
+        container,
+      } = await setupOptimizerPage();
+      // Select broken & manual link checkboxes
+      fireEvent.click(getByLabelText(scanResultsMessages.brokenLabel.defaultMessage));
+      fireEvent.click(getByLabelText(scanResultsMessages.manualLabel.defaultMessage));
+
+      const collapsibleTrigger = container.querySelector('.collapsible-trigger');
+      expect(collapsibleTrigger).toBeInTheDocument();
+      fireEvent.click(collapsibleTrigger);
+
+      // Assert that all links are displayed
+      await waitFor(() => {
+        expect(getByText('Test Broken Links')).toBeInTheDocument();
+        expect(getByText('Test Manual Links')).toBeInTheDocument();
+        expect(queryByText('Test Locked Links')).not.toBeInTheDocument();
+      });
+
+      // Click on the "Broken" chip to filter the results
+      const brokenChip = getByTestId('chip-brokenLinks');
+      fireEvent.click(brokenChip);
+
+      // Assert that only manual links are displayed
+      await waitFor(() => {
+        expect(queryByText('Test Broken Links')).not.toBeInTheDocument();
+        expect(getByText('Test Manual Links')).toBeInTheDocument();
+        expect(queryByText('Test Locked Links')).not.toBeInTheDocument();
+      });
+
+      // Click the "Clear filters" button
+      const clearFiltersButton = getByText(scanResultsMessages.clearFilters.defaultMessage);
+      fireEvent.click(clearFiltersButton);
+
+      // Assert that all links are displayed after clearing filters
+      await waitFor(() => {
+        expect(getByText('Test Broken Links')).toBeInTheDocument();
+        expect(getByText('Test Manual Links')).toBeInTheDocument();
+        expect(getByText('Test Locked Links')).toBeInTheDocument();
+      });
+    });
   });
 });

src/optimizer-page/scan-results/ScanResults.tsx

@@ -4,6 +4,7 @@ import {
   Chip,
   Button,
   useCheckboxSetValues,
+  useToggle,
 } from '@openedx/paragon';
 import {
   ArrowDropDown,
@@ -34,7 +35,7 @@ interface Props {
 
 const ScanResults: FC<Props> = ({ data }) => {
   const intl = useIntl();
-  const [isModalOpen, setModalOpen] = useState(false);
+  const [isOpen, open, close] = useToggle(false);
   const initialFilters = {
     brokenLinks: false,
     lockedLinks: false,
@@ -76,7 +77,7 @@ const ScanResults: FC<Props> = ({ data }) => {
           <Button
             ref={setButtonRef}
             variant="outline-primary"
-            onClick={() => setModalOpen(true)}
+            onClick={open}
             disabled={false}
             iconAfter={ArrowDropDown}
             className="rounded-sm justify-content-between cadence-button"
@@ -86,8 +87,10 @@ const ScanResults: FC<Props> = ({ data }) => {
         </header>
       </div>
       <FilterModal
-        isOpen={isModalOpen}
-        onClose={() => setModalOpen(false)}
+        isOpen={isOpen}
+        // ignoring below line because filter modal doesn't have close button
+        // istanbul ignore next
+        onClose={close}
         onApply={setFilters}
         positionRef={buttonRef}
         filterOptions={filterOptions}
@@ -105,6 +108,7 @@ const ScanResults: FC<Props> = ({ data }) => {
             {activeFilters.map(filter => (
               <Chip
                 key={filter}
+                data-testid={`chip-${filter}`}
                 iconAfter={CloseSmall}
                 iconAfterAlt="icon-after"
                 className="scan-results-active-filters-chip"