fix bug: previously clicking cancel on admin details page opens edit panel

[annyhe]

• fix UI bug
• add tests to show bug is fixed
• introduce airbnb enzyme to react unit testing.

Why enzyme?

• more concise, easier to read tests --> easier to maintain
• .find(className or nodeName) to find DOM element in rendered tree,
  vs. TestUtils verbose props.children...props.children
• based off of React.TestUtils
• relatively stable (v.2.6) and well-documented:
  http://brewhouse.io/2016/03/18/accelerate-your-react-testing-with-enzyme.html
  https://medium.com/airbnb-engineering/enzyme-javascript-testing-utilities-for-react-a417e5e5090f#.xyjupa296

[coveralls]

Coverage remained the same at 83.951% when pulling 1e33650 on cancelsProperly into c8424e5 on master.

[coveralls]

Coverage remained the same at 83.951% when pulling 1e33650 on cancelsProperly into c8424e5 on master.

[coveralls]

Coverage remained the same at 83.951% when pulling 1e33650 on cancelsProperly into c8424e5 on master.

[annyhe]

Review app at http://refocus-pr-91.herokuapp.com//subjects/Salesforce.SFDC_Core.WAX.SPX.NA21.
Click on the cancel button on Delete modal, or the x on upper left, to close the Delete modal.

[iamigo]

@meynet license ok for this new external dependency?

[annyhe]

@iamigo @meynet Enzyme uses MIT license. https://www.npmjs.com/package/enzyme

[pallavi2209]

@annyhe When I go to http://refocus-pr-91.herokuapp.com/subjects/Salesforce.SFDC_Core.WAX.SPX.CS33 and click Add child, then cancel, I am redirected to subject list page. Is that expected?

[coveralls]

Coverage remained the same at 83.951% when pulling 906d426 on cancelsProperly into 4df2b8f on master.

[iamigo]

When I go to http://refocus-pr-91.herokuapp.com/subjects/Salesforce.SFDC_Core.WAX.SPX.CS33 and click Add child, then cancel, I am redirected to subject list page. Is that expected?

I'm ok with having it like it is for right now--it's a UI design question we should let Jee decide when she gets to it.

[annyhe]

@pallavi2209 Yes that is the expected behavior, and identical to the UI on the master.

[coveralls]

Coverage remained the same at 83.951% when pulling a5ab098 on cancelsProperly into 2337cc5 on master.