add test for failing description

Author: kastiglione

lldb/test/API/lang/objc/failing-description/Makefile

@@ -0,0 +1,3 @@
+OBJC_SOURCES := main.m
+LD_EXTRAS := -lobjc -framework Foundation
+include Makefile.rules

lldb/test/API/lang/objc/failing-description/TestObjCFailingDescription.py

@@ -0,0 +1,17 @@
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+
+
+class TestCase(TestBase):
+    def test(self):
+        self.build()
+        lldbutil.run_to_source_breakpoint(self, "break here", lldb.SBFileSpec("main.m"))
+        self.expect(
+            "expr -O -- bad", substrs=["error:", "expression interrupted", "(Bad *) 0x"]
+        )
+        self.expect(
+            "dwim-print -O -- bad",
+            substrs=["error:", "expression interrupted", "_lookHere = NO"],
+        )

lldb/test/API/lang/objc/failing-description/main.m

@@ -0,0 +1,21 @@
+#import <Foundation/Foundation.h>
+
+@interface Bad : NSObject
+@end
+
+@implementation Bad {
+  BOOL _lookHere;
+}
+
+- (NSString *)description {
+  int *i = NULL;
+  *i = 0;
+  return @"surprise";
+}
+@end
+
+int main() {
+  Bad *bad = [Bad new];
+  printf("break here\n");
+  return 0;
+}