Add UI Tests

[dzenbot]

Since this library consists, mainly, of custom UI elements, a great way to test it is by using Snapshot Test Case: it takes a configured UIView or CALayer and uses the renderInContext: method to get an image snapshot of its contents. It compares this snapshot to a reference image stored in the source code repository and fails the test if the two images don't match. Differences are visible by using tools like Kaleidoscope.

Areas to look at:

• [x] TextView growing mechanism and guarantee its positioning on top of the keyboard
• [x] Display of text input outlets
• [ ] Auto-correction & edit modes
• [ ] Auto-Correction & Predictive Bar states
• [ ] Undo/Redo & Copy/Cut/Paste custom mechanisms
• [ ] Multiple screen sizes support (iPhone 4, 5, 6, 6+ and iPad)
• [ ] Multiple orientations support (landscape & portrait)
• [ ] External keyboard support (very important once, which also requieres logic tests)
• More TBD

Tools:

• FBSnapshotTestCase
• Specta & Expecta

To Install:

• [x] Install Expecta+Snapshots, which provides an Expecta-like API to FBSnapshotTestCase.
  pod 'Expecta+Snapshots', '~> 1.0'
• [x] Install XCode plugin Snapshots (via Alcatraz) to easily compare the success and failure images for any inline failed test in Xcode.

Process

• To be able to cover most iOS fragmentations, we are going to run test for multiple devices, OS and orientations.

Reading Material:

• http://www.objc.io/issue-15/snapshot-testing.html