test: add test coverages

lib/hooks/useDebouncedQuery/useDebouncedQuery.js

@@ -23,7 +23,7 @@ export const useDebouncedQuery = ({
   const [inputValue, setInputValue] = useState('');
   const [options, setOptions] = useState([]);
   const ky = useOkapiKy();
-  const [namespace] = useNamespace({ key: 'locations' });
+  const [namespace] = useNamespace({ key: 'debounced-query' });
 
   const debouncedSetInputValue = useMemo(() => {
     return debounce((value) => setInputValue(value), debounceDelay);

lib/hooks/useDebouncedQuery/useDebouncedQuery.test.js

@@ -0,0 +1,67 @@
+import {
+  QueryClient,
+  QueryClientProvider,
+} from 'react-query';
+
+import { renderHook, act } from '@testing-library/react-hooks';
+import { useOkapiKy } from '@folio/stripes/core';
+
+import { useDebouncedQuery } from './useDebouncedQuery';
+
+const DELAY = 300;
+
+jest.useFakeTimers('modern');
+const mockDataFormatter = jest.fn(({ poLines }) => {
+  return poLines.map(({ id, poLineNumber }) => ({ label: poLineNumber, value: id }));
+});
+
+const queryClient = new QueryClient();
+const wrapper = ({ children }) => (
+  <QueryClientProvider client={queryClient}>
+    {children}
+  </QueryClientProvider>
+);
+
+describe('useDebouncedQuery', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+    useOkapiKy.mockReturnValue({
+      get: jest.fn(() => ({
+        json: () => Promise.resolve({ poLines: [{ id: 'poLine-1', poLineNumber: '11111' }] }),
+      })),
+    });
+  });
+
+  it('should not call `dataFormatter` and return empty []', async () => {
+    const { result } = renderHook(() => useDebouncedQuery({
+      api: 'api',
+      queryBuilder: jest.fn(),
+      dataFormatter: mockDataFormatter,
+      debounceDelay: DELAY,
+    }), { wrapper });
+
+    await act(async () => {
+      await result.current.setInputValue('');
+      jest.advanceTimersByTime(1500);
+    });
+
+    expect(mockDataFormatter).toHaveBeenCalledTimes(0);
+    expect(result.current.options).toEqual([]);
+  });
+
+  it('should call `dataFormatter` and return options', async () => {
+    const { result } = renderHook(() => useDebouncedQuery({
+      api: 'api',
+      queryBuilder: jest.fn(),
+      dataFormatter: mockDataFormatter,
+    }), { wrapper });
+
+    await act(async () => {
+      await result.current.setInputValue('test');
+      jest.advanceTimersByTime(1500);
+    });
+
+    expect(mockDataFormatter).toHaveBeenCalledTimes(1);
+    expect(result.current.options).toEqual([{ label: '11111', value: 'poLine-1' }]);
+  });
+});