Setup tests environment

tests/servers/ServersDropdown.test.js

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+import React from 'react';
+import { ServersDropdown } from '../../src/servers/ServersDropdown';
+import { shallow } from 'enzyme';
+
+describe('ServersDropdown', () => {
+  let wrapped;
+  const servers = [{ name: 'foo' }, { name: 'bar' }, { name: 'baz' }];
+
+  beforeEach(() => {
+    wrapped = shallow(<ServersDropdown servers={servers} />);
+  });
+  afterEach(() => {
+    wrapped.unmount();
+  });
+
+  it('contains the list of servers', () => {
+    expect(wrapped.find('DropdownItem').length).toEqual(servers.length);
+  });
+
+  it('contains a toggle with proper title', () => {
+    expect(wrapped.find('DropdownToggle').length).toEqual(1);
+  });
+});