1 files changed, 121 insertions, 0 deletions
diff --git a/packages/Python/lldbsuite/test/terminal/TestSTTYBeforeAndAfter.py b/packages/Python/lldbsuite/test/terminal/TestSTTYBeforeAndAfter.py
new file mode 100644
index 0000000000000..335042737d442
--- /dev/null
+++ b/packages/Python/lldbsuite/test/terminal/TestSTTYBeforeAndAfter.py
@@ -0,0 +1,121 @@
+"""
+Test that 'stty -a' displays the same output before and after running the lldb command.
+"""
+
+from __future__ import print_function
+
+
+
+import os
+import lldb
+from lldbsuite.test.lldbtest import *
+
+class TestSTTYBeforeAndAfter(TestBase):
+
+    mydir = TestBase.compute_mydir(__file__)
+
+    @classmethod
+    def classCleanup(cls):
+        """Cleanup the test byproducts."""
+        cls.RemoveTempFile("child_send1.txt")
+        cls.RemoveTempFile("child_read1.txt")
+        cls.RemoveTempFile("child_send2.txt")
+        cls.RemoveTempFile("child_read2.txt")
+
+    @expectedFailureHostWindows("llvm.org/pr22274: need a pexpect replacement for windows")
+    @no_debug_info_test
+    def test_stty_dash_a_before_and_afetr_invoking_lldb_command(self):
+        """Test that 'stty -a' displays the same output before and after running the lldb command."""
+        import pexpect
+        if not which('expect'):
+            self.skipTest("The 'expect' program cannot be located, skip the test")
+
+        # The expect prompt.
+        expect_prompt = "expect[0-9.]+> "
+        # The default lldb prompt.
+        lldb_prompt = "(lldb) "
+
+        # So that the child gets torn down after the test.
+        self.child = pexpect.spawn('expect')
+        child = self.child
+
+        child.expect(expect_prompt)
+        child.setecho(True)
+        if self.TraceOn():
+            child.logfile = sys.stdout
+
+        if self.platformIsDarwin():
+            child.sendline('set env(TERM) xterm')
+        else:
+            child.sendline('set env(TERM) vt100')
+        child.expect(expect_prompt)
+        child.sendline('puts $env(TERM)')
+        child.expect(expect_prompt)
+
+        # Turn on loggings for input/output to/from the child.
+        with open('child_send1.txt', 'w') as f_send1:
+            with open('child_read1.txt', 'w') as f_read1:
+                child.logfile_send = f_send1
+                child.logfile_read = f_read1
+
+                child.sendline('stty -a')
+                child.expect(expect_prompt)
+
+        # Now that the stage1 logging is done, restore logfile to None to
+        # stop further logging.
+        child.logfile_send = None
+        child.logfile_read = None
+
+        # Invoke the lldb command.
+        child.sendline('%s %s' % (lldbtest_config.lldbExec, self.lldbOption))
+        child.expect_exact(lldb_prompt)
+
+        # Immediately quit.
+        child.sendline('quit')
+        child.expect(expect_prompt)
+
+        with open('child_send2.txt', 'w') as f_send2:
+            with open('child_read2.txt', 'w') as f_read2:
+                child.logfile_send = f_send2
+                child.logfile_read = f_read2
+
+                child.sendline('stty -a')
+                child.expect(expect_prompt)
+
+                child.sendline('exit')
+
+        # Now that the stage2 logging is done, restore logfile to None to
+        # stop further logging.
+        child.logfile_send = None
+        child.logfile_read = None
+
+        with open('child_send1.txt', 'r') as fs:
+            if self.TraceOn():
+                print("\n\nContents of child_send1.txt:")
+                print(fs.read())
+        with open('child_read1.txt', 'r') as fr:
+            from_child1 = fr.read()
+            if self.TraceOn():
+                print("\n\nContents of child_read1.txt:")
+                print(from_child1)
+
+        with open('child_send2.txt', 'r') as fs:
+            if self.TraceOn():
+                print("\n\nContents of child_send2.txt:")
+                print(fs.read())
+        with open('child_read2.txt', 'r') as fr:
+            from_child2 = fr.read()
+            if self.TraceOn():
+                print("\n\nContents of child_read2.txt:")
+                print(from_child2)
+
+        stty_output1_lines = from_child1.splitlines()
+        stty_output2_lines = from_child2.splitlines()
+        zipped = list(zip(stty_output1_lines, stty_output2_lines))
+        for tuple in zipped:
+            if self.TraceOn():
+                print("tuple->%s" % str(tuple))
+            # Every line should compare equal until the first blank line.
+            if len(tuple[0]) == 0:
+                break
+            self.assertTrue(tuple[0] == tuple[1])