Fix the local(Test Test) syntax in @font-face src

Related to #487.

weasyprint/css/descriptors.py

@@ -56,7 +56,7 @@ def font_family(tokens, allow_spaces=False):
     """``font-family`` descriptor validation."""
     allowed_types = ['ident']
     if allow_spaces:
-        allowed_types.append('S')
+        allowed_types.append('whitespace')
     if len(tokens) == 1 and tokens[0].type == 'string':
         return tokens[0].value
     if tokens and all(token.type in allowed_types for token in tokens):

weasyprint/tests/test_css_descriptors.py

@@ -56,6 +56,33 @@ def test_font_face():
     assert font_weight == ('font_weight', 200)
     assert font_stretch == ('font_stretch', 'condensed')
 
+    stylesheet = tinycss2.parse_stylesheet(
+        '@font-face {'
+        '  font-family: Gentium Hard;'
+        '  src: local();'
+        '}')
+    at_rule, = stylesheet
+    assert at_rule.at_keyword == 'font-face'
+    font_family, src = list(preprocess_descriptors(
+        'http://weasyprint.org/foo/',
+        tinycss2.parse_declaration_list(at_rule.content)))
+    assert font_family == ('font_family', 'Gentium Hard')
+    assert src == ('src', [('local', None)])
+
+    # See bug #487
+    stylesheet = tinycss2.parse_stylesheet(
+        '@font-face {'
+        '  font-family: Gentium Hard;'
+        '  src: local(Gentium Hard);'
+        '}')
+    at_rule, = stylesheet
+    assert at_rule.at_keyword == 'font-face'
+    font_family, src = list(preprocess_descriptors(
+        'http://weasyprint.org/foo/',
+        tinycss2.parse_declaration_list(at_rule.content)))
+    assert font_family == ('font_family', 'Gentium Hard')
+    assert src == ('src', [('local', 'Gentium Hard')])
+
 
 def test_bad_font_face():
     """Test bad ``font-face`` rules."""