adding libs for testing
testing if the source file exists
testing if the sound is playing a song normally
creating tests for pause/stop controls
creating tests for stop control
refactoring tests and creating tests for volume control
creating tests for mute/unmute control
adding some group testing
support to travis-ci
just typo
add travisci icon
changing travis config
Merge unit tests from felipebenevides pull-request and make some changes