forgot the actual test for the test

tests/test_cmd.py

@@ -0,0 +1,17 @@
+import pytest
+import csv
+
+from countess.core.cmd import main as countess_cmd
+
+expected_output=""""thing","foo","bar","baz","qux","number","zz"
+"bar",10,2,1,4,232,0.08620689655172414
+"baz",11,3,2,1,565,0.0584070796460177
+"qux",12,9,8,7,999,0.10810810810810811
+"""
+
+def test_command_invocation():
+    countess_cmd(["countess_cmd", "simple.ini"])
+
+    with open("tests/output.csv", "r") as fh:
+        output = fh.read()
+        assert output == expected_output