Run mypy over tests as well

Rationale: https://twitter.com/codewithanthony/status/1188958327318794241

mypy.ini

@@ -51,6 +51,14 @@ ignore_missing_imports = True
 # https://github.com/python/typeshed/issues/1019
 ignore_missing_imports = True
 
+[mypy-helpers.*]
+# test helpers only importable via pytest
+ignore_missing_imports = True
+
+[mypy-pytest]
+# https://github.com/pytest-dev/pytest/issues/3342
+ignore_missing_imports = True
+
 [mypy-qutebrowser.browser.webkit.rfc6266]
 # subclasses dynamic PyPEG2 classes
 disallow_subclassing_any = False

tests/conftest.py

@@ -87,7 +87,7 @@ def _apply_platform_markers(config, item):
         ('unicode_locale', sys.getfilesystemencoding() == 'ascii',
          "Skipped because of ASCII locale"),
         ('qtwebkit6021_skip',
-         version.qWebKitVersion and
+         version.qWebKitVersion and  # type: ignore
          version.qWebKitVersion() == '602.1',
          "Broken on WebKit 602.1")
     ]
@@ -211,7 +211,7 @@ def pytest_configure(config):
 
     try:
         # Added in sip 4.19.4
-        sip.enableoverflowchecking(True)
+        sip.enableoverflowchecking(True)  # type: ignore
     except AttributeError:
         pass
 

tox.ini

@@ -197,10 +197,11 @@ passenv = TERM
 deps =
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/misc/requirements/requirements-dev.txt
+    -r{toxinidir}/misc/requirements/requirements-tests.txt
     -r{toxinidir}/misc/requirements/requirements-pyqt.txt
     -r{toxinidir}/misc/requirements/requirements-mypy.txt
 commands =
-    {envpython} -m mypy qutebrowser {posargs}
+    {envpython} -m mypy qutebrowser tests {posargs}
 
 [testenv:sphinx]
 basepython = {env:PYTHON:python3}