Write error to stderr

src/synthale/recipes.py

@@ -2,6 +2,7 @@
 
 import os
 import re
+import sys
 
 import pybeerxml
 
@@ -42,12 +43,12 @@ def load_file(path):
     """Parse BeerXML file located at `path`.
 
     Return a list of MarkdownRecipe objects. If an exception is raised during
-    parsing, the message is printed to stdout and an empty list is returned.
+    parsing, the message is printed to stderr and an empty list is returned.
     """
     try:
         result = pybeerxml.Parser().parse(path)
     except Exception as err:
-        print(err)
+        print('Error parsing {}: {}'.format(path, err), file=sys.stderr)
         return []
 
     recipes = []

tests/test_recipes.py

@@ -5,13 +5,16 @@ import pybeerxml
 from synthale.recipes import MarkdownRecipe, load_file, load_all_files
 
 
-def test_load_file():
+def test_load_file(capsys):
     """Load the sample XML file and ensure the name is parsed."""
     result = load_file('tests/recipes/weizen.xml')
     assert result[0].recipe.name == 'Weizen'
 
     result = load_file('tests/recipes/bad-file')
+    captured = capsys.readouterr()
     assert result == []
+    assert captured.err == ('Error parsing tests/recipes/bad-file: '
+                            'syntax error: line 1, column 0\n')
 
 
 def test_load_all_files():