UIIN-1698 JEST/RTL test cases for HoldingsMarcContainer

src/Holding/HoldingsMarc/HoldingsMarcContainer.test.js

@@ -0,0 +1,30 @@
+import React from 'react';
+import { render, screen } from '@testing-library/react';
+import '../../../test/jest/__mock__';
+import { MemoryRouter } from 'react-router-dom';
+import HoldingsMarcContainer from './HoldingsMarcContainer';
+
+jest.mock('../../components/ViewSource/ViewSource', () => jest.fn().mockReturnValue('ViewSource'));
+
+describe('HoldingsMarcContainer', () => {
+  const mutator = {
+    marcInstance: {
+      GET: jest.fn(),
+    },
+    marcRecord: {
+      GET: jest.fn(),
+    },
+  };
+
+  const instanceId = '123';
+  const holdingsrecordid = '456';
+
+  it('should render a loading indicator when holdings data is loading', () => {
+    render(
+      <MemoryRouter>
+        <HoldingsMarcContainer mutator={mutator} holdingsrecordid={holdingsrecordid} instanceId={instanceId} />
+      </MemoryRouter>
+    );
+    expect(screen.getByText('ViewSource')).toBeInTheDocument();
+  });
+});