tests: add test coverage

lib/Donors/Donors.test.js

@@ -1,5 +1,6 @@
 import { MemoryRouter } from 'react-router-dom';
 import { render, screen } from '@testing-library/react';
+import user from '@testing-library/user-event';
 
 import stripesFinalForm from '@folio/stripes/final-form';
 
@@ -11,6 +12,17 @@ jest.mock('@folio/stripes/components', () => ({
   Loading: jest.fn(() => 'Loading'),
 }));
 
+jest.mock('./DonorsLookup', () => ({
+  DonorsLookup: jest.fn(({ onAddDonors }) => (
+    <button
+      type="button"
+      onClick={() => onAddDonors([{ id: 'donorId' }])}
+    >
+      Add donor
+    </button>
+  )),
+}));
+
 jest.mock('./hooks', () => ({
   useFetchDonors: jest.fn().mockReturnValue({
     donors: [],
@@ -66,4 +78,16 @@ describe('Donors', () => {
 
     expect(screen.getByText('Loading')).toBeDefined();
   });
+
+  it('should call onChange when donorOrganizationIds changed', () => {
+    const onChange = jest.fn();
+
+    renderComponent({ onChange });
+
+    const addDonorButton = screen.getByText('Add donor');
+
+    user.click(addDonorButton);
+
+    expect(onChange).toHaveBeenCalled();
+  });
 });