Add some tests to useSelectWithDebounce

The test is not complete, since we're having an issue to simulate the debounce timers.

assets/react-hooks/use-select-with-debounce.js

@@ -9,7 +9,6 @@ import { debounce } from 'lodash';
 import { useSelect } from '@wordpress/data';
 import { useState, useEffect, useCallback } from '@wordpress/element';
 
-// TODO: Write tests.
 /**
  * Use select hook with debounce.
  *

assets/react-hooks/use-select-with-debounce.test.js

@@ -0,0 +1,44 @@
+/**
+ * External dependencies
+ */
+import { render } from '@testing-library/react';
+
+/**
+ * WordPress dependencies
+ */
+import { useSelect } from '@wordpress/data';
+
+/**
+ * Internal dependencies
+ */
+import useSelectWithDebounce from './use-select-with-debounce';
+
+jest.mock( '@wordpress/data' );
+
+describe( 'useSelectWithDebounce', () => {
+	it( 'Should change the deps to call useSelect after timer only', () => {
+		jest.useFakeTimers();
+		const mapSelect = () => {};
+		const timer = 1000;
+		const mockFn = jest.fn();
+		useSelect.mockImplementation( mockFn );
+
+		const TestComponent = ( { deps } ) => {
+			useSelectWithDebounce( mapSelect, deps, timer );
+			return <div />;
+		};
+
+		const deps1 = [ 1 ];
+		const deps2 = [ 2 ];
+
+		const { rerender } = render( <TestComponent deps={ deps1 } /> );
+		expect( mockFn ).toBeCalledWith( mapSelect, deps1 );
+
+		rerender( <TestComponent deps={ deps2 } /> );
+		expect( mockFn ).toBeCalledWith( mapSelect, deps1 );
+
+		// TODO: Complete test running debounce to make sure it was called after the time.
+		// jest.runAllTimers();
+		// expect( mockFn ).toBeCalledWith( mapSelect, deps2 );
+	} );
+} );