content: import React from 'react';
  import ReactTestUtils from 'react/lib/ReactTestUtils';
  import Tooltip from '../src/Tooltip';
  
  describe('Tooltip', () => {
    it('Should output a tooltip with content', () => {
      let instance = ReactTestUtils.renderIntoDocument(
        <Tooltip positionTop={10} positionLeft={20}>
          <strong>Tooltip Content</strong>
        </Tooltip>
      );
      assert.ok(ReactTestUtils.findRenderedDOMComponentWithTag(instance, 'strong'));
  
      const tooltip = ReactTestUtils.findRenderedDOMComponentWithClass(instance, 'tooltip');
      assert.deepEqual(tooltip.props.style, {top: 10, left: 20});
    });
  
    describe('When a style property is provided', () => {
      it('Should render a tooltip with merged styles', () => {
        let instance = ReactTestUtils.renderIntoDocument(
          <Tooltip style={{opacity: 0.9}} positionTop={10} positionLeft={20}>
            <strong>Tooltip Content</strong>
          </Tooltip>
        );
        const tooltip = ReactTestUtils.findRenderedDOMComponentWithClass(instance, 'tooltip');
        assert.deepEqual(tooltip.props.style, {opacity: 0.9, top: 10, left: 20});
      });
    });
  });
  