check-random-within#95
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@samth I never noticed this PR. There are no tests and no docs. If you add those, we can marge it in. |
check-random-within combines check-random and check-within: the test
and expected expressions are evaluated with the same freshly-seeded
pseudo-random generator (like check-random), and the two results are
then compared up to a tolerance (like check-within). This is the form
to use when a random computation produces inexact numbers, which
check-random refuses to compare.
- test-engine/racket-tests: add the check-random-within syntax and
do-check-random-within, and provide it.
- lang/htdp-{beginner,beginner-abbr,intermediate,intermediate-lambda,
advanced}: export check-random-within to the student languages.
- typed/test-engine/type-env-ext: give do-check-random-within a type.
- htdp-doc .../prim-ops: document the new form.
- htdp-test .../test-engine/racket-tests: test pass, failure, and the
non-number-tolerance error.
Supersedes the stale draft in racket#95, which predated the rewrite of
check-random into do-check-random. (Grammar BNF listing in
std-grammar.rkt + per-language .scrbl is a remaining follow-up.)
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