From c01818f6b26f0ac22e48c09a09c00a20cfc9b2ac Mon Sep 17 00:00:00 2001
From: Vincent St-Amour <stamourv@racket-lang.org>
Date: Fri, 25 May 2012 14:34:41 -0400
Subject: [PATCH] Add random testing script for float types.

original commit: 142158c0cbd325891be6f039651673805c461077
---
 .../tests/typed-racket/tr-random-testing.rkt  | 125 ++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 collects/tests/typed-racket/tr-random-testing.rkt

diff --git a/collects/tests/typed-racket/tr-random-testing.rkt b/collects/tests/typed-racket/tr-random-testing.rkt
new file mode 100644
index 00000000..93a91008
--- /dev/null
+++ b/collects/tests/typed-racket/tr-random-testing.rkt
@@ -0,0 +1,125 @@
+#lang racket
+
+;; Random testing of type preservation for floats.
+
+(require redex
+         racket/flonum racket/unsafe/ops
+         racket/sandbox)
+
+(require (except-in typed-racket/utils/utils infer)
+         (typecheck typechecker)
+         (utils tc-utils)
+         (types subtype utils)
+         typed-racket/infer/infer-dummy typed-racket/infer/infer)
+
+(require (prefix-in b: (base-env base-env))
+         (prefix-in n: (base-env base-env-numeric)))
+
+(b:init) (n:init)
+(define-namespace-anchor anch)
+
+(define-language tr-arith ; to stay within floats, removed some numeric ops
+  [n real]
+  [E n
+     (* E)
+     (* E E)
+     (* E E E)
+     (+ E)
+     (+ E E)
+     (+ E E E)
+     (- E)
+     (- E E)
+     (- E E E)
+     (/ E)
+     (/ E E)
+     (/ E E E)
+     (max E)
+     (max E E)
+     (max E E E)
+     (min E)
+     (min E E)
+     (min E E E)
+     (add1 E)
+     (sub1 E)
+     (abs E)
+     (floor E)
+     (ceiling E)
+     (truncate E)
+     (round E)
+     (log E)
+     (exp E)
+     (cos E)
+     (sin E)
+     (tan E)
+     (sqr E)
+     (flabs E)
+     (flround E)
+     (flfloor E)
+     (flceiling E)
+     (fltruncate E)
+     (flsin E)
+     (flcos E)
+     (fltan E)
+     (flatan E)
+     (flasin E)
+     (flacos E)
+     (fllog E)
+     (flexp E)
+     (flsqrt E)
+     (unsafe-flabs E)
+     (unsafe-flmin E E)
+     (unsafe-flmax E E)
+     (unsafe-flsqrt E)
+     (fl+ E E)
+     (fl- E E)
+     (fl* E E)
+     (fl/ E E)
+     (flmin E E)
+     (flmax E E)
+     (flexpt E E)
+     (unsafe-fl+ E E)
+     (unsafe-fl- E E)
+     (unsafe-fl* E E)
+     (unsafe-fl/ E E)
+     ])
+;; generated from: (map car (file->list "base-env-parts"))
+
+(define (get-type e [typecheck (compose tc-expr expand)])
+  (parameterize ([delay-errors? #f]
+                 [current-namespace (namespace-anchor->namespace anch)]
+                 [custom-printer #t]
+                 [infer-param infer]
+                 [orig-module-stx (quote-syntax e)])
+    (typecheck (datum->syntax #'here e))))
+
+(define (right-type? before)
+  (define type-before (match (get-type before) [(tc-result1: b) b]))
+  (define after (eval before (namespace-anchor->namespace anch)))
+  (define type-after (get-type after tc-literal))
+  (define subtype? (subtype type-after type-before))
+  subtype?)
+
+;; Redex can't generate floats, so we convert ints to floats.
+(define (exp->float-exp E) ; numbers or symbols or lists
+  (cond [(number? E)
+         (exact->inexact (* (random) E))] ; add noise
+        [(list? E)
+         (map exp->float-exp E)]
+        [else
+         E]))
+
+(define (check-all-floats sexp)
+  (or (with-handlers
+          ;; something went wrong, almost certainly typechecking failed
+          ;; in which case we ignore the expression
+          ([exn? (const #t)])
+        (get-type sexp)
+        #f) ; go on and check preservation
+      (right-type? sexp)))
+
+(call-with-limits
+ #f 1000
+ (lambda ()
+   (redex-check tr-arith E (check-all-floats (term E))
+                #:attempts 1000
+                #:prepare exp->float-exp)))