Index: packages/Python/lldbsuite/test/functionalities/mtc/simple/Makefile
===================================================================
--- packages/Python/lldbsuite/test/functionalities/mtc/simple/Makefile
+++ packages/Python/lldbsuite/test/functionalities/mtc/simple/Makefile
@@ -0,0 +1,6 @@
+LEVEL = ../../../make
+
+OBJC_SOURCES := main.m
+LDFLAGS = $(CFLAGS) -lobjc -framework Foundation -framework AppKit
+
+include $(LEVEL)/Makefile.rules
Index: packages/Python/lldbsuite/test/functionalities/mtc/simple/TestMTCSimple.py
===================================================================
--- packages/Python/lldbsuite/test/functionalities/mtc/simple/TestMTCSimple.py
+++ packages/Python/lldbsuite/test/functionalities/mtc/simple/TestMTCSimple.py
@@ -0,0 +1,65 @@
+"""
+Tests basic Main Thread Checker support (detecting a main-thread-only violation).
+"""
+
+import os
+import time
+import lldb
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test.decorators import *
+import lldbsuite.test.lldbutil as lldbutil
+import json
+
+
+class MTCSimpleTestCase(TestBase):
+
+    mydir = TestBase.compute_mydir(__file__)
+
+    @skipUnlessDarwin
+    def test(self):
+        mtc_dylib_path = ""
+        with os.popen('xcode-select -p') as output:
+            xcode_developer_path = output.read().strip()
+            mtc_dylib_path = '%s/usr/lib/libMainThreadChecker.dylib' % xcode_developer_path
+            if not os.path.isfile(mtc_dylib_path):
+                mtc_dylib_path = ""
+
+        if mtc_dylib_path == "":
+            self.skipTest("This test requires libMainThreadChecker.dylib.")
+            return
+
+        self.mtc_dylib_path = mtc_dylib_path
+
+        self.build()
+        self.mtc_tests()
+
+    def setUp(self):
+        # Call super's setUp().
+        TestBase.setUp(self)
+
+    def mtc_tests(self):
+        # Load the test
+        exe = os.path.join(os.getcwd(), "a.out")
+        self.expect("file " + exe, patterns=["Current executable set to .*a.out"])
+
+        self.runCmd("env DYLD_INSERT_LIBRARIES=%s" % self.mtc_dylib_path)
+        self.runCmd("run")
+
+        process = self.dbg.GetSelectedTarget().process
+        thread = process.GetSelectedThread()
+        frame = thread.GetSelectedFrame()
+
+        self.expect("thread info", substrs=['stop reason = -[NSView superview] must be called from main thread only'])
+
+        self.expect(
+            "thread info -s",
+            substrs=["instrumentation_class", "api_name", "class_name", "selector", "description"])
+        self.assertEqual(thread.GetStopReason(), lldb.eStopReasonInstrumentation)
+        output_lines = self.res.GetOutput().split('\n')
+        json_line = '\n'.join(output_lines[2:])
+        data = json.loads(json_line)
+        self.assertEqual(data["instrumentation_class"], "MainThreadChecker")
+        self.assertEqual(data["api_name"], "-[NSView superview]")
+        self.assertEqual(data["class_name"], "NSView")
+        self.assertEqual(data["selector"], "superview")
+        self.assertEqual(data["description"], "-[NSView superview] must be called from main thread only")
Index: packages/Python/lldbsuite/test/functionalities/mtc/simple/main.m
===================================================================
--- packages/Python/lldbsuite/test/functionalities/mtc/simple/main.m
+++ packages/Python/lldbsuite/test/functionalities/mtc/simple/main.m
@@ -0,0 +1,15 @@
+#import <Foundation/Foundation.h>
+#import <AppKit/AppKit.h>
+
+int main() {
+  NSView *view = [[NSView alloc] init];
+  dispatch_group_t g = dispatch_group_create();
+  dispatch_group_enter(g);
+  [NSThread detachNewThreadWithBlock:^{
+    @autoreleasepool {
+      [view superview];
+    }
+    dispatch_group_leave(g);
+  }];
+  dispatch_group_wait(g, DISPATCH_TIME_FOREVER);
+}