name output_file with input_file

tests/test_filter.py

@@ -6,7 +6,17 @@ from etl import filter_mastermap
 def test_filter_mastermap():
     """Test that MasterMap CSV can be correctly filtered to include only buildings."""
     input_file = "tests/test_mastermap.gml.csv"  # Test csv with one building and one non-building
+    output_file = input_file.replace('gml', 'filtered')
     filter_mastermap(input_file)  # creates test_mastermap.filtered.csv
-    with open('tests/test_mastermap.filtered.csv', newline='') as csvfile:
+    with open(output_file, newline='') as csvfile:
         csv_array = list(csv.reader(csvfile))
-    assert len(csv_array) == 2  # assert that length is 2 because just one row after header
+    assert len(csv_array) == 2  # assert that length is 2 because just one row after header
+    
+    
+# def test_filter_mastermap_missing_type():
+#     """Test that MasterMap CSV can be correctly filtered when the polygon does not have a type specified."""
+#     input_file = "tests/test_mastermap_missing_type.gml.csv"  # Test csv with one building and one non-building
+#     filter_mastermap(input_file)  # creates test_mastermap.filtered.csv
+#     with open('tests/test_mastermap.filtered.csv', newline='') as csvfile:
+#         csv_array = list(csv.reader(csvfile))
+#     assert len(csv_array) == 2  # assert that length is 2 because just one row after header