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-rw-r--r--test-suite/tests/parameters.test61
1 files changed, 61 insertions, 0 deletions
diff --git a/test-suite/tests/parameters.test b/test-suite/tests/parameters.test
index 9d0a092ab..78b57c68d 100644
--- a/test-suite/tests/parameters.test
+++ b/test-suite/tests/parameters.test
@@ -67,3 +67,64 @@
(lambda ()
(parameterize ((inside? #t))
(raise 'some-exception)))))))))
+
+(let ()
+ (define (test-ports param new-port new-port-2)
+ (let ((old-port (param)))
+
+ (pass-if "new value"
+ (parameterize ((param new-port))
+ (eq? (param) new-port)))
+
+ (pass-if "set value"
+ (parameterize ((param old-port))
+ (param new-port)
+ (eq? (param) new-port)))
+
+ (pass-if "old restored"
+ (parameterize ((param new-port))
+ #f)
+ (eq? (param) old-port))
+
+ (pass-if "throw exit"
+ (catch 'bail
+ (lambda ()
+ (parameterize ((param new-port))
+ (throw 'bail)))
+ (lambda args #f))
+ (eq? (param) old-port))
+
+ (pass-if "call/cc re-enter"
+ (let ((cont #f)
+ (count 0)
+ (port #f)
+ (good #t))
+ (parameterize ((param new-port))
+ (call/cc (lambda (k) (set! cont k)))
+ (set! count (1+ count))
+ (set! port (param))
+ (if (= 1 count) (param new-port-2)))
+ (set! good (and good (eq? (param) old-port)))
+ (case count
+ ((1)
+ (set! good (and good (eq? port new-port)))
+ ;; re-entering should give new-port-2 left there last time
+ (cont))
+ ((2)
+ (set! good (and good (eq? port new-port-2)))))
+ good))
+
+ (pass-if "original unchanged"
+ (eq? (param) old-port))))
+
+ (with-test-prefix "current-input-port"
+ (test-ports current-input-port
+ (open-input-string "xyz") (open-input-string "xyz")))
+
+ (with-test-prefix "current-output-port"
+ (test-ports current-output-port
+ (open-output-string) (open-output-string)))
+
+ (with-test-prefix "current-error-port"
+ (test-ports current-error-port
+ (open-output-string) (open-output-string))))