[PATCH v4] Allow TTY tests to run under recent Mac OS

TTY tests were previously skipped on all Mac OS systems because of a
bug where reading from pty master occasionally hung. This bug has since
been found not to be reproducible under Mac OS 10.9 and 10.10.1.

Therefore, run TTY tests under Mac OS 10.9 (Mavericks) and higher.

Signed-off-by: Mike Blume <redacted>
Improved-by: Junio C Hamano [off-list ref]
Signed-off-by: Junio C Hamano <redacted>
Improved-by: John Szakmeister [off-list ref]
Improved-by: Johannes Sixt [off-list ref]
Improved-by: Jeff King [off-list ref]
---
 t/lib-terminal.sh | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/t/lib-terminal.sh b/t/lib-terminal.sh
index 5184549..275fb09 100644
--- a/t/lib-terminal.sh
+++ b/t/lib-terminal.sh

@@ -29,7 +29,12 @@ test_lazy_prereq TTY '
 	# After 2000 iterations or so it hangs.
 	# https://rt.cpan.org/Ticket/Display.html?id=65692
 	#
-	test "$(uname -s)" != Darwin &&
+	# Under Mac OS X 10.9, this problem appears to be gone.
+	#
+	{
+		test "$(uname -s)" != Darwin ||
+		test "$(uname -r | cut -d. -f1)" -ge 13
+	} &&
 
 	perl "$TEST_DIRECTORY"/test-terminal.perl \
 		sh -c "test -t 1 && test -t 2"

-- 
2.2.0.rc1.197.g60bf093