Bug 1713 - You can't check the existence of a typedef using the preprocessor. Added a preprocessor check. Also removed an overqualified method name.
## like simplest.message, but doesn't use VALID_HEADER
## convenience command. mostly to test the test framework.
LITTLE_ENDIAN
BYTE 'l'
BYTE 1
BYTE 0
BYTE 0
LENGTH Header
LENGTH Body
## client serial
INT32 7
HEADER_FIELD PATH
TYPE OBJECT_PATH
OBJECT_PATH '/foo'
HEADER_FIELD INTERFACE
TYPE STRING
STRING 'org.freedesktop.Foo'
HEADER_FIELD MEMBER
TYPE STRING
STRING 'Bar'
HEADER_FIELD SIGNATURE
TYPE STRING
STRING ''
ALIGN 8
END_LENGTH Header
START_LENGTH Body
END_LENGTH Body