Created ImportServersBtn test

test/servers/helpers/ImportServersBtn.test.js

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+import React from 'react';
+import { ImportServersBtn } from '../../../src/servers/helpers/ImportServersBtn';
+import sinon from 'sinon';
+import { shallow } from 'enzyme';
+import { UncontrolledTooltip } from 'reactstrap';
+
+describe('<ImportServersBtn />', () => {
+  let wrapper;
+  const onImportMock = sinon.fake();
+  const createServersMock = sinon.fake();
+  const serversImporterMock = {
+    importServersFromFile: sinon.fake.returns(Promise.resolve([])),
+  };
+  const fileRef = {
+    current: { click: sinon.fake() }
+  };
+
+  beforeEach(() => {
+    onImportMock.resetHistory();
+    createServersMock.resetHistory();
+    serversImporterMock.importServersFromFile.resetHistory();
+    fileRef.current.click.resetHistory();
+
+    wrapper = shallow(
+      <ImportServersBtn
+        onImport={onImportMock}
+        createServers={createServersMock}
+        serversImporter={serversImporterMock}
+        fileRef={fileRef}
+      />
+    );
+  });
+  afterEach(() => wrapper.unmount());
+
+  it('renders a button, a tooltip and a file input', () => {
+    expect(wrapper.find('#importBtn')).toHaveLength(1);
+    expect(wrapper.find(UncontrolledTooltip)).toHaveLength(1);
+    expect(wrapper.find('.create-server__csv-select')).toHaveLength(1);
+  });
+
+  it('triggers click on file ref when button is clicked', () => {
+    const btn = wrapper.find('#importBtn');
+    btn.simulate('click');
+
+    expect(fileRef.current.click.callCount).toEqual(1);
+  });
+
+  it('imports servers when file input changes', done => {
+    const file = wrapper.find('.create-server__csv-select');
+    file.simulate('change', { target: { files: [''] } });
+
+    setImmediate(() => {
+      expect(serversImporterMock.importServersFromFile.callCount).toEqual(1);
+      expect(createServersMock.callCount).toEqual(1);
+      expect(onImportMock.callCount).toEqual(1);
+      done();
+    });
+  });
+});