Create is_key_header negative test for test_compound_identifier.py (#…

…1330)

Co-authored-by: Dhanshree Arora <[email protected]>

test/test_compound_identifier.py

@@ -9,8 +9,13 @@ def compound_identifier():
 def test_is_input_header_positive(compound_identifier, header):
     """Test that valid input headers return True."""
     assert compound_identifier.is_input_header(header) is True
-
+    
 @pytest.mark.parametrize("header", ["key", "inchiKey", "KEY", "INCHIKEY"])
 def test_is_key_header_positive(compound_identifier, header):
     """Test that valid key headers return True."""
-    assert compound_identifier.is_key_header(header) is True
+    assert compound_identifier.is_key_header(header) is True
+
+@pytest.mark.parametrize("header", ["id","smiles","inchi","input", "some_header", "random", "header", ""])
+def test_is_key_header_negative(compound_identifier, header):
+    assert not compound_identifier.is_key_header(header)
+