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diff --git a/deps/v8/test/mjsunit/debug-enable-disable-breakpoints.js b/deps/v8/test/mjsunit/debug-enable-disable-breakpoints.js
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+// Copyright 2008 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --expose-debug-as debug
+// Get the Debug object exposed from the debug context global object.
+Debug = debug.Debug
+
+// Simple debug event handler which just counts the number of break points hit.
+var break_point_hit_count;
+
+function listener(event, exec_state, event_data, data) {
+  if (event == Debug.DebugEvent.Break) {
+    break_point_hit_count++;
+  }
+};
+
+// Add the debug event listener.
+Debug.setListener(listener);
+
+// Test function.
+function f() {a=1;b=2;};
+
+// This tests enabeling and disabling of break points including the case
+// with several break points in the same location.
+break_point_hit_count = 0;
+
+// Set a breakpoint in f.
+bp1 = Debug.setBreakPoint(f);
+f();
+assertEquals(1, break_point_hit_count);
+
+// Disable the breakpoint.
+Debug.disableBreakPoint(bp1);
+f();
+assertEquals(1, break_point_hit_count);
+
+// Enable the breakpoint.
+Debug.enableBreakPoint(bp1);
+f();
+assertEquals(2, break_point_hit_count);
+
+// Set another breakpoint in f at the same place.
+bp2 = Debug.setBreakPoint(f);
+f();
+assertEquals(3, break_point_hit_count);
+
+// Disable the second breakpoint.
+Debug.disableBreakPoint(bp2);
+f();
+assertEquals(4, break_point_hit_count);
+
+// Disable the first breakpoint.
+Debug.disableBreakPoint(bp1);
+f();
+assertEquals(4, break_point_hit_count);
+
+// Enable both breakpoints.
+Debug.enableBreakPoint(bp1);
+Debug.enableBreakPoint(bp2);
+f();
+assertEquals(5, break_point_hit_count);
+
+// Disable the first breakpoint.
+Debug.disableBreakPoint(bp1);
+f();
+assertEquals(6, break_point_hit_count);