tests: fix pytest 6.x coverage

.coveragerc

@@ -2,6 +2,7 @@
 [run]
 source = luma.lcd
 omit =
+    luma/__init__.py
     setup.py
     .tox/*
     doc/*

MANIFEST.in

@@ -1,4 +1,4 @@
-include README.rst CHANGES.rst CONTRIBUTING.rst LICENSE.rst tox.ini setup.cfg .coveragerc
+include README.rst CHANGES.rst CONTRIBUTING.rst LICENSE.rst tox.ini setup.cfg pytest.ini .coveragerc
 
 recursive-include luma *.py
 

doc/install.rst

@@ -17,7 +17,7 @@ Finally, you need to leverage the appropriate interface class and display
 class for your device to implement your application.  Instructions for that
 are included in :doc:`python-usage`.
 
-.. note:: This library has been tested against Python 3.5, 3.6, 3.7 and 3.8.
+.. note:: This library has been tested against Python 3.6 and newer.
 
   It was *originally* tested with Raspbian on a rev.2 model B, with a vanilla
   kernel version 4.1.16+, and has subsequently been tested on Raspberry Pi

pytest.ini

@@ -0,0 +1,3 @@
+[pytest]
+addopts = --timeout=10 -v -r wsx
+

setup.py

@@ -34,7 +34,7 @@ def find_version(*file_paths):
 needs_pytest = {'pytest', 'test', 'ptr'}.intersection(sys.argv)
 pytest_runner = ['pytest-runner'] if needs_pytest else []
 test_deps = [
-    'pytest<=4.5',
+    'pytest',
     'pytest-cov',
     'pytest-timeout'
 ]

tox.ini

@@ -6,10 +6,11 @@ envlist = py{36,37,38,39},qa,doc
 skip_missing_interpreters = True
 
 [testenv]
+usedevelop = true
 commands =
     python setup.py install
-    coverage run -m py.test --timeout=10 -v -r w
-    coverage report
+    pytest --cov=luma
+    coverage html
 deps = .[test]
 
 [testenv:qa]