in_file.py should be able to parse "in" files

Source/core/scripts/in_file_unittest.py

 #!/usr/bin/env python
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 24 matching lines @@
     def test_basic_parse(self):
         contents = """
 name1 arg=value, arg2=value2, arg2=value3
 name2
 """
         lines = contents.split("\n")
         defaults = {
             'arg': None,
             'arg2': [],
         }
-        in_file = InFile(lines, defaults)
+        in_file = InFile(lines, defaults, None)
         expected_values = [
             {'name': 'name1', 'arg': 'value', 'arg2': ['value2', 'value3']},
             {'name': 'name2', 'arg': None, 'arg2': []},
         ]
         self.assertEquals(in_file.name_dictionaries, expected_values)
 
+    def test_with_parameters(self):
+        contents = """namespace=TestNamespace

[eseidel, 2013/04/30 21:46:16]

Yes, requiring no leading newline is making your tests awkward too. :)  I could
imagine wanting to have something like this:

# This is an awesome file

# Needed to make foo work
foo=bar
 
#neded for bar
bar=baz

here
we
go
now

We obviously don't need to support this on day one.

[abarth-chromium, 2013/04/30 21:50:44]

Actually, it looks like the Perl support leading blank lines before switching
into parameter mode.  It doesn't support interspersed blank lines, however. 
I'll update the Python to better match the Perl.

After we remove the Perl, I agree that we'll want to improve the syntax of these
files.

+fruit
+
+name1 arg=value, arg2=value2, arg2=value3
+name2
+"""
+        lines = contents.split("\n")
+        defaults = {
+            'arg': None,
+            'arg2': [],
+        }
+        default_parameters = {
+            'namespace': '',
+            'fruit': False,
+        }
+        in_file = InFile(lines, defaults, default_parameters)
+        expected_parameters = {
+            'namespace': 'TestNamespace',
+            'fruit': True,
+        }
+        self.assertEquals(in_file.parameters, expected_parameters)
+
+
 if __name__ == "__main__":
     unittest.main()