I'm new to testing with Pytest, and I've run into a minor but annoying hangup. 

In the command line test session results, I see my tests passing, but the percentage shown is not 100%, for some tests. 

With some aggressive logging, I was able to confirm that my tests are passing as expected.

My question is: what's the meaning of the percentage that is displayed for the collected tests?

Example:

```
platform win32 -- Python 3.7.0a4, pytest-3.5.0, py-1.5.3, pluggy-0.6.0
rootdir: C:\api-check, inifile:
collected 5 items

test_Me.py ...                                                           [ 60%]
test_env.py ..                                                           [100%]

========================== 5 passed in 6.04 seconds ===========================

```