Created ExportBtn test

test/utils/ExportBtn.test.tsx

@@ -0,0 +1,57 @@
+import { shallow, ShallowWrapper } from 'enzyme';
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
+import { faFileDownload } from '@fortawesome/free-solid-svg-icons';
+import { ExportBtn } from '../../src/utils/ExportBtn';
+
+describe('<ExportBtn />', () => {
+  let wrapper: ShallowWrapper;
+  const onClick = jest.fn();
+  const createWrapper = (className?: string, amount?: number) => {
+    wrapper = shallow(<ExportBtn className={className} amount={amount} onClick={onClick} />);
+
+    return wrapper;
+  };
+
+  afterEach(jest.clearAllMocks);
+  afterEach(() => wrapper?.unmount());
+
+  it.each([
+    [ undefined ],
+    [ 'foo' ],
+    [ 'bar' ],
+  ])('renders a button', (className) => {
+    const wrapper = createWrapper(className);
+
+    expect(wrapper.prop('outline')).toEqual(true);
+    expect(wrapper.prop('color')).toEqual('primary');
+    expect(wrapper.prop('onClick')).toEqual(onClick);
+    expect(wrapper.prop('className')).toEqual(className);
+  });
+
+  it.each([
+    [ undefined, '0' ],
+    [ 10, '10' ],
+    [ 10_000, '10,000' ],
+    [ 10_000_000, '10,000,000' ],
+  ])('renders expected amount', (amount, expectedRenderedAmount) => {
+    const wrapper = createWrapper(undefined, amount);
+
+    expect(wrapper.html()).toContain(`Export (${expectedRenderedAmount})`);
+  });
+
+  it('renders expected icon', () => {
+    const wrapper = createWrapper();
+    const icon = wrapper.find(FontAwesomeIcon);
+
+    expect(icon).toHaveLength(1);
+    expect(icon.prop('icon')).toEqual(faFileDownload);
+  });
+
+  it('invokes callback onClick', () => {
+    const wrapper = createWrapper();
+
+    expect(onClick).not.toHaveBeenCalled();
+    wrapper.simulate('click');
+    expect(onClick).toHaveBeenCalledTimes(1);
+  });
+});