Add comments and clean up whitespace

tests/test_c_generator.py

@@ -430,7 +430,7 @@ def test_to_type_with_cpp(self):
  memmgr_path = self._find_file('memmgr.h')
 
  ast2 = parse_file(memmgr_path, use_cpp=True,
- cpp_path = cpp_path(), cpp_args = cpp_args())
+ cpp_path=cpp_path(), cpp_args=cpp_args())
  void_ptr_type = ast2.ext[-3].type.type
  void_type = void_ptr_type.type
  self.assertEqual(generator.visit(c_ast.Cast(void_ptr_type, test_fun)),

tests/test_util.py

@@ -1,14 +1,29 @@
+#------------------------------------------------------------------------------
+# pycparser: test_util.py
+#
+# Utility code for tests.
+#
+# Eli Bendersky [https://eli.thegreenplace.net/]
+# This file contributed by [email protected]
+# License: BSD
+#------------------------------------------------------------------------------
 import platform
 
+
 def cpp_supported():
+ """Is cpp (the C preprocessor) supported as a native command?"""
  return platform.system() == 'Linux' or platform.system() == 'Darwin'
 
+
 def cpp_path():
+ """Path to cpp command."""
  if platform.system() == 'Darwin':
  return 'gcc'
  return 'cpp'
 
+
 def cpp_args(args=[]):
+ """Turn args into a suitable format for passing to cpp."""
  if isinstance(args, str):
  args = [args]
  if platform.system() == 'Darwin':