Add tests for Port class
Modify params and fix bug
Use terminal-notifier-guard
Add tests for Link class
Enable Coveralls
Add Coveralls badge

[skip ci]
Add test for Image.generate_diagram
Replace #diagram_description spec to #node_description spec
Remove unused methods
s/#generate_diagram/.generate_diagram/
Add tests for Image methods
Remove duplicated lines
Add tests for instance methods of Chartroom::Container
Add more tests
Add test for Container.generate_diagram
Fix style
Merge pull request #8 from dtan4/add-tests

Add tests