test for issue #145

[ghost]

this is a simple test to make sure that the method argument of concatenate contains the correct value (chain or compose).
It also checks to see that a media file (knights.mp4) is present. if it is not, it will download it from youtube. Note: user must have youtube-dl installed for this to work correctly.

[Zulko]

I like it, but you should then add 'tests/media' to the .gitignore so that the media downloaded by the tests won't be accidentally merged into the git repo.

[keikoro]

@Earney What's that first commit, the "Merge pull request 1 from Zulko/master"? It looks like an empty commit, could you just delete it to avoid unnecessary "pollution" of the commit history? (You'll be able to get rid of it by rebasing your commits, then force-pushing to your fork.)

[ghost]

@kerstin the first commit is a pull from the main fork zulko/master so that my repo is up to date, and contains all commits since I forked my repo. I'm not sure what will happen when I try merging back in to the main fork. I may try to merge it back in and see what happens. If the commit sticks around then I'll try rebasing in the future.