TST: add script to run tests (#49)

* TST: add script to run tests

Since stubs-only packages have to be installed, add a simple script
that installs the stubs and then invokes pytest.

* MAINT: rename runtests -> runtests.py

* MAINT: invoke pip under `sys.executable`

Author: person142

runtests.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+import os
+import subprocess
+import sys
+
+import pytest
+
+STUBS_ROOT = os.path.dirname(os.path.abspath(__file__))
+
+
+def main():
+    subprocess.run(
+        [sys.executable, '-m', 'pip', 'install', STUBS_ROOT],
+        capture_output=True,
+        check=True,
+    )
+    sys.exit(pytest.main([STUBS_ROOT] + sys.argv[1:]))
+
+
+if __name__ == '__main__':
+    main()