Add a simple argparse test just so tests return status 0

test/test_main.py

@@ -0,0 +1,8 @@
+from clinvar_gk_pilot.main import parse_args
+
+
+def test_parse_args():
+    argv = ["--filename", "test.txt"]
+    opts = parse_args(argv)
+    assert opts["filename"] == "test.txt"
+    assert len(opts) == 1