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-rw-r--r--tests/iogt.test9
1 files changed, 9 insertions, 0 deletions
diff --git a/tests/iogt.test b/tests/iogt.test
index 50034de..33a6425 100644
--- a/tests/iogt.test
+++ b/tests/iogt.test
@@ -839,6 +839,15 @@ test iogt-6.0 {Push back} -constraints testchannel -body {
close $f
} -result {xxx}
test iogt-6.1 {Push back and up} -constraints {testchannel knownBug} -body {
+
+ # This test demonstrates the bug/misfeature in the stacked
+ # channel implementation that data can be discarded if it is
+ # read into the buffers of one channel in the stack, and then
+ # that channel is popped before anything above it reads.
+ #
+ # This bug can be worked around by always setting -buffersize
+ # to 1, but who wants to do that?
+
set f [open $path(dummy) r]
# contents of dummy = "abcdefghi..."
read $f 3; # skip behind "abc"