Improve test coverage

[jjochen]

No description provided.

[codecov]

Codecov Report

Merging #16 into develop will increase coverage by 3.98%.
The diff coverage is 94.91%.

@@             Coverage Diff             @@
##           develop      #16      +/-   ##
===========================================
+ Coverage    75.73%   79.71%   +3.98%     
===========================================
  Files            5        6       +1     
  Lines          511      567      +56     
===========================================
+ Hits           387      452      +65     
+ Misses         124      115       -9

Impacted Files	Coverage Δ
...ample/UITests/JJFloatingActionButton_UITests.swift	100% <100%> (ø)
...e/JJFloatingActionButton/FirstViewController.swift	80% <57.14%> (+1.73%)	⬆️
...oatingActionButton/Classes/JJCircleImageView.swift	95.38% <0%> (+13.84%)	⬆️

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