Py.Test : Reporting and HTML output

I think you also need to specify the directory/file you want coverage for like py.test --cov=MYPKG --cov-report=html after which a html/index.html is generated.

if you do not specify --cov=/path/to/code then it will not generate the html at all.

$ py.test --cov-report html test_smoke.py
== test session starts == 
platform linux2 -- Python 2.7.12, pytest-3.4.0, py-1.5.2, pluggy-0.6.0 rootdir: /home/someuser/somedir, inifile: plugins: xdist-1.22.0, forked-0.2, cov-2.5.1 collected 3 items                                                                 


test_smoke.py ...                                             [100%]

== 3 passed in 0.67 seconds ==

We can see that there is no message that output was created... However if we specify --cov=...

$ py.test --cov-report html test_smoke.py --cov=/path/to/code
== test session starts ==
platform linux2 -- Python 2.7.12, pytest-3.4.0, py-1.5.2, pluggy-0.6.0
rootdir: /home/someuser/somedir, inifile:
plugins: xdist-1.22.0, forked-0.2, cov-2.5.1
collected 3 items                                                                                                                                                                                                                                                         

test_smoke.py ...                                            [100%] 

---------- coverage: platform linux2, python 2.7.12-final-0 ----------
Coverage HTML written to dir htmlcov

We now see that there are no stats for tests that passed, instead we see that coverage was written to HTML and sent to the default directory: ./htmlcov

NOTE: if you want a different directory, then affix :/path/to/directory to the output style html -> py.test --cov-report html:/path/to/htmldir test_smoke.py --cov=/path/to/code

If you see a plain html file, this is an indication that your problem is the --cov=/path/to/my/pkg perhaps... are you sure that the code you are testing lives here?