[lldb] Add a test for terminal dimensions

Add a test for the term-width and term-height settings.

Author: JDevlieghere

lldb/test/API/driver/terminal/TestTerminalDimensions.py

@@ -0,0 +1,22 @@
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+from lldbsuite.test.lldbpexpect import PExpectTest
+
+
+class TerminalDimensionsTest(PExpectTest):
+    NO_DEBUG_INFO_TESTCASE = True
+
+    @skipIfAsan
+    def test(self):
+        """Test that the lldb driver correctly reports the (PExpect) terminal dimension."""
+        self.launch(dimensions=(40, 40), timeout=1)
+
+        # Tests clear all the settings so we lose the launch values. Resize the
+        # window to update the settings. These new values need to be different
+        # to trigger a SIGWINCH.
+        self.child.setwinsize(20, 60)
+
+        self.expect("settings show term-height", ["term-height (unsigned) = 20"])
+        self.expect("settings show term-width", ["term-width (unsigned) = 60"])