Added MyPy runner to unit tests

setup.cfg

@@ -6,6 +6,7 @@ python_version = 3.7
 warn_unused_ignores = True
 ignore_missing_imports = True
 follow_imports = skip
+incremental = True
 
 [pep8]
 max-line-length = 100

tests/test_mypy.py

+import pathlib
+import unittest
+
+import mypy.api
+
+test_modules = ['flamenco_worker', 'tests']
+
+
+class MypyRunnerTest(unittest.TestCase):
+    def test_run_mypy(self):
+        proj_root = pathlib.Path(__file__).parent.parent
+        args = ['--incremental', '--ignore-missing-imports'] + [str(proj_root / dirname) for dirname
+                                                                in test_modules]
+
+        result = mypy.api.run(args)
+
+        stdout, stderr, status = result
+
+        messages = []
+        if stderr:
+            messages.append(stderr)
+        if stdout:
+            messages.append(stdout)
+        if status:
+            messages.append('Mypy failed with status %d' % status)
+        if messages:
+            self.fail('\n'.join(['Mypy errors:'] + messages))