Created DuplicatedServerModal test

test/servers/helpers/DuplicatedServerModal.test.tsx

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+import { shallow, ShallowWrapper } from 'enzyme';
+import { Mock } from 'ts-mockery';
+import { Button } from 'reactstrap';
+import { DuplicatedServerModal } from '../../../src/servers/helpers/DuplicatedServerModal';
+import { ServerData } from '../../../src/servers/data';
+
+describe('<DuplicatedServerModal />', () => {
+  const onDiscard = jest.fn();
+  const onSave = jest.fn();
+  let wrapper: ShallowWrapper;
+  const createWrapper = (serverData?: ServerData) => {
+    wrapper = shallow(
+      <DuplicatedServerModal
+        serverData={serverData}
+        isOpen={true}
+        toggle={jest.fn()}
+        onDiscard={onDiscard}
+        onSave={onSave}
+      />,
+    );
+
+    return wrapper;
+  };
+
+  beforeEach(jest.clearAllMocks);
+  afterEach(() => wrapper?.unmount());
+
+  it.each([
+    [ undefined ],
+    [ Mock.of<ServerData>({ url: 'url', apiKey: 'apiKey' }) ],
+  ])('displays provided server data', (serverData) => {
+    const wrapper = createWrapper(serverData);
+    const li = wrapper.find('li');
+
+    expect(li.first().find('b').html()).toEqual(`<b>${serverData?.url ?? ''}</b>`);
+    expect(li.last().find('b').html()).toEqual(`<b>${serverData?.apiKey ?? ''}</b>`);
+  });
+
+  it('invokes onDiscard when appropriate button is clicked', () => {
+    const wrapper = createWrapper();
+    const btn = wrapper.find(Button).first();
+
+    btn.simulate('click');
+
+    expect(onDiscard).toHaveBeenCalled();
+  });
+
+  it('invokes onSave when appropriate button is clicked', () => {
+    const wrapper = createWrapper();
+    const btn = wrapper.find(Button).last();
+
+    btn.simulate('click');
+
+    expect(onSave).toHaveBeenCalled();
+  });
+});