Refactor so that all tests use minimee() to instantiate models.
Refactor so that minimee() generates our Guzzle\Http\Client or mock.
Clean up namespacing.
Use constants for consistency.
Move all DI setup into own method.
Refactor to use own bootstrap.
Add comments about being unable to use DI.
Organise assets tests folder.
Fix custom bootstrap so that we can extend our own base class.
"move" 404 asset.
Bug fix: minifyCssEnabled now works (thanks, Unit Testing!)
Test minifyAsset()! Also, refactor testing isCombineEnabled for better coverage.
Test appendToCacheBase().
Test checkHeaders().
Refactor for more green.
Assert that more methods return self when done.
Move plugin init settings into own method so we can test.
Make note to roadmap.
Move importing to an internal autoload.
Use getter and setter for pluginSettings (for testability).