On Tue, 3 Apr 2007 16:01:56 +0100
Joel Reymont <[EMAIL PROTECTED]> wrote:
Folks,
I'm trying to figure out how to test a Parsec-based parser with
Smallcheck [1]. My test AST is below and the goal is to return
StyleValue <Int here> if the parser is fed an integer, or return
Solid when parsing "Solid", etc.
data Style
= StyleValue Expr
| Solid
| Dashed
| Dotted
| Dashed2
| Dashed3
deriving Show
I'd use QuickCheck rather than SmallCheck. First write Arbitrary
instances for Style and Expr (plus obviously any other types used by
Expr). Then write another generator that converts a Style to a string
with random formatting (whitespace, comments etc). Then assert that the
parse of the generated string is equal to the original value.
You might also want to write another string generator that also inserts
random syntax errors, so you can test for the correct detection of
syntax errors.
Paul.
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