Is it possible to run Py.Test tests on Eclipse Che/Codenvy?
pytest is not currently in the test framework like JUnit is but since you have a command line you could run your tests manually or create a custom command from the commands tab on the left. 

click the "+" under "TEST"
replace the "Command Line" entry that reads echo "hello" with 
python ${current.project.relpath}
click save
With your python test file selected in the Project Explorer, click run on your new custom test shift+F10.
Self explanatory question here.
Is this even possible? Can't find any documentation regarding this anywhere.. 
And if not, how complicated is it to write a plugin?
Thanks!