Description of problem:
https://src.fedoraproject.org/rpms/python-pygraphviz/c/8b5d68f8817bec53cc43236ead19ff9be63f1911?branch=master removed the tests directory.
However, a simple `import pygraphviz` will import things from that directory. So the package is now broken.

Version-Release number of selected component (if applicable):
python3-pygraphviz-1.5-2.fc30.x86_64

Steps to Reproduce:
1. mock -r fedora-rawhide-x86_64 --install python3-pygraphviz
2. mock -r fedora-rawhide-x86_64 --shell
3. python3 -c 'import pygraphviz'

Actual results:
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib64/python3.7/site-packages/pygraphviz/__init__.py", line 70, in <module>
    from pygraphviz.tests.test import run as test
ModuleNotFoundError: No module named 'pygraphviz.tests'


Expected results:
No error.