TST: Check equivalence of two styles of call

Author: DWesl

tests/test_main.py

@@ -1,5 +1,6 @@
 """Test the function used by the installed script."""
 
+import glob
 import os.path
 
 import pytest
@@ -19,3 +20,10 @@ def test_call_empty(to_pass):
 def test_call_single():
     """Test that calling with a single directory finds files."""
     assert main([THIS_DIR]) > 0
+
+
+def test_dir_equals_files():
+    """Test equivalence of calls with single dir vs files."""
+    single_result = main([THIS_DIR])
+    multi_result = main(glob.glob(os.path.join(THIS_DIR, "*.[ch]")))
+    assert single_result == multi_result