Skip early if stdin and stdout are not ttys
diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index 244e55f..55fb63a 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -996,6 +996,8 @@
@unittest.skipUnless(pty, "the pty and signal modules must be available")
def check_input_tty(self, prompt, terminal_input, stdio_encoding=None):
+ if not sys.stdin.isatty() or not sys.stdout.isatty():
+ self.skipTest("stdin and stdout must be ttys")
r, w = os.pipe()
try:
pid, fd = pty.fork()