Debugger test to ensure break on exception works

runtime/vm/debugger_api_impl_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "include/dart_debugger_api.h"
 #include "include/dart_mirrors_api.h"
 #include "platform/assert.h"
 #include "vm/dart_api_impl.h"
 #include "vm/thread.h"
 #include "vm/unit_test.h"
@@ skipping 2011 matching lines @@
   Dart_SetExceptionPauseInfo(kPauseOnAllExceptions);
   breakpoint_hit_counter = 0;
 
   Dart_Handle result = Dart_EvaluateExpr(script_lib, NewString(
       "() { var p = new Point(3, 4); throw p; } ())"));
   EXPECT(Dart_IsError(result));
   EXPECT_EQ(1, breakpoint_hit_counter);
 }
 
 
+static void UnhandledExceptionHandler(Dart_IsolateId isolate_id,
+                                      Dart_Handle exception_object,
+                                      Dart_StackTrace trace) {
+  breakpoint_hit_counter++;
+}
+
+
+// Check that the debugger is not called when an exception is
+// caught by Dart code.
+TEST_CASE(Debug_BreakOnUnhandledException) {
+  const char* kScriptChars =
+      "void main() {                   \n"
+      "  try {                         \n"
+      "    throw 'broccoli';           \n"
+      "  } catch (e) {                 \n"
+      "    return 'carrots';           \n"
+      "  }                             \n"
+      "  return 'zucchini';            \n"
+      "}                               \n";
+
+  LoadScript(kScriptChars);
+  Dart_FinalizeLoading();
+  Dart_SetExceptionThrownHandler(&UnhandledExceptionHandler);
+  breakpoint_hit_counter = 0;
+
+  // Check that the debugger is not called since the exception
+  // is handled.
+  Dart_SetExceptionPauseInfo(kPauseOnUnhandledExceptions);
+  Dart_Handle res = Invoke("main");
+  EXPECT_VALID(res);
+  EXPECT(Dart_IsString(res));
+  EXPECT_STREQ("carrots", ToCString(res));
+  EXPECT_EQ(0, breakpoint_hit_counter);
+
+  // Check that the debugger is called when "break on all
+  // exceptions" is turned on.
+  Dart_SetExceptionPauseInfo(kPauseOnAllExceptions);
+  Dart_Handle res2 = Invoke("main");
+  EXPECT_VALID(res2);
+  EXPECT(Dart_IsString(res2));
+  EXPECT_STREQ("carrots", ToCString(res2));
+  EXPECT_EQ(1, breakpoint_hit_counter);
+}
+
+
 TEST_CASE(Debug_GetClosureInfo) {
   const char* kScriptChars =
       "void foo() { return 43; } \n"
       "                          \n"
       "main() {                  \n"
       "  return foo;             \n"
       "}                         \n";
 
   LoadScript(kScriptChars);
   Dart_Handle clo = Invoke("main");
@@ skipping 218 matching lines @@
       " null, 3, 7, 1, 8, 6, 9, 10, 10, 11, 11, 13,"
       " null, 4, 13, 3, 14, 10,"
       " null, 5, 17, 5, 18, 9, 19, 12,"
       " null, 6, 21, 1,"
       " null, 8, 24, 1, 25, 5, 26, 6, 27, 8,"
       " null, 9, 29, 1]",
       tokens_cstr);
 }
 
 }  // namespace dart