Turn on branch coverage (#790)

* Run pre commit hook tests on all platforms TEMPORARILY

* Use os.system instead of subprocess.call

* Turn on branch coverage

* Let's try this then

* More testing!

* Update test_meta.py

.travis.yml

@@ -34,4 +34,5 @@ script:
   - pytest -v --cov=telegram
 
 after_success:
-  coveralls
+  - coverage combine
+  - coveralls

setup.cfg

@@ -26,8 +26,10 @@ filterwarnings =
     ignore::DeprecationWarning
 
 [coverage:run]
-branch = False
+branch = True
 source = telegram
+parallel = True
+concurrency = thread, multiprocessing
 omit =
     tests/
     telegram/__main__.py

tests/test_meta.py

@@ -26,7 +26,7 @@ import pytest
 
 def call_pre_commit_hook(hook_id):
     __tracebackhide__ = True
-    return subprocess.call(['pre-commit', 'run', '--all-files', hook_id])
+    return os.system(' '.join(['pre-commit', 'run', '--all-files', hook_id]))
 
 
 @pytest.mark.parametrize('hook_id', argvalues=('yapf', 'flake8', 'pylint'))
@@ -39,4 +39,4 @@ def test_pre_commit_hook(hook_id):
 
 
 def test_build():
-    assert subprocess.call(['python', 'setup.py', 'bdist_dumb']) == 0
+    assert os.system('python setup.py bdist_dumb') == 0