Add test for stack

plugins/woocommerce-admin/client/tasks/fills/experimental-products/test/stack.tsx

@@ -0,0 +1,49 @@
+/**
+ * External dependencies
+ */
+import { render, waitFor } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+
+/**
+ * Internal dependencies
+ */
+import Stack from '../stack';
+import { productTypes } from '../constants';
+
+describe( 'Stack', () => {
+	it( 'should render stack with given product type and two links', () => {
+		const { queryByText, queryAllByRole } = render(
+			<Stack
+				onClickLoadSampleProduct={ () => {} }
+				items={ [
+					{
+						...productTypes[ 0 ],
+						onClick: () => {},
+					},
+				] }
+			/>
+		);
+		expect( queryByText( productTypes[ 0 ].title ) ).toBeInTheDocument();
+		expect( queryAllByRole( 'link' ) ).toHaveLength( 2 );
+	} );
+
+	it( 'should call onClickLoadSampleProduct when the "Load Sample Products" link is clicked', async () => {
+		const onClickLoadSampleProduct = jest.fn();
+		const { getByRole } = render(
+			<Stack
+				onClickLoadSampleProduct={ onClickLoadSampleProduct }
+				items={ [
+					{
+						...productTypes[ 0 ],
+						onClick: () => {},
+					},
+				] }
+			/>
+		);
+
+		userEvent.click(
+			getByRole( 'link', { name: 'Load Sample Products' } )
+		);
+		await waitFor( () => expect( onClickLoadSampleProduct ).toBeCalled() );
+	} );
+} );