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

Source/core/scripts/in_file_unittest.py

Index: Source/core/scripts/in_file_unittest.py
diff --git a/Source/core/scripts/in_file_unittest.py b/Source/core/scripts/in_file_unittest.py
index 7b3b038cf6d173894e43d1f67378fd285f107a7e..e065d442987150afe98b0910ff3a814f53e5fbae 100644
--- a/Source/core/scripts/in_file_unittest.py
+++ b/Source/core/scripts/in_file_unittest.py
@@ -42,12 +42,36 @@ name2
             '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()