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diff --git a/test/mjsunit/debug-breakpoints.js b/test/mjsunit/debug-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
+
+function f() {a=1;b=2};
+function g() {
+  a=1;
+  b=2;
+}
+
+bp = Debug.setBreakPoint(f, 0, 0);
+assertEquals("() {[B0]a=1;b=2}", Debug.showBreakPoints(f));
+Debug.clearBreakPoint(bp);
+assertEquals("() {a=1;b=2}", Debug.showBreakPoints(f));
+bp1 = Debug.setBreakPoint(f, 0, 8);
+assertEquals("() {a=1;[B0]b=2}", Debug.showBreakPoints(f));
+bp2 = Debug.setBreakPoint(f, 0, 4);
+assertEquals("() {[B0]a=1;[B1]b=2}", Debug.showBreakPoints(f));
+bp3 = Debug.setBreakPoint(f, 0, 12);
+assertEquals("() {[B0]a=1;[B1]b=2}[B2]", Debug.showBreakPoints(f));
+Debug.clearBreakPoint(bp1);
+assertEquals("() {[B0]a=1;b=2}[B1]", Debug.showBreakPoints(f));
+Debug.clearBreakPoint(bp2);
+assertEquals("() {a=1;b=2}[B0]", Debug.showBreakPoints(f));
+Debug.clearBreakPoint(bp3);
+assertEquals("() {a=1;b=2}", Debug.showBreakPoints(f));
+
+// The following test checks that the Debug.showBreakPoints(g) produces output
+// like follows when changein breakpoints.
+//
+// function g() {
+//   [BX]a=1;
+//   [BX]b=2;
+// }[BX]
+
+// Test set and clear breakpoint at the first possible location (line 0,
+// position 0).
+bp = Debug.setBreakPoint(g, 0, 0);
+// function g() {
+//   [B0]a=1;
+//   b=2;
+// }
+assertTrue(Debug.showBreakPoints(g).indexOf("[B0]a=1;") > 0);
+Debug.clearBreakPoint(bp);
+// function g() {
+//   a=1;
+//   b=2;
+// }
+assertTrue(Debug.showBreakPoints(g).indexOf("[B0]") < 0);
+
+// Second test set and clear breakpoints on lines 1, 2 and 3 (position = 0).
+bp1 = Debug.setBreakPoint(g, 2, 0);
+// function g() {
+//   a=1;
+//   [B0]b=2;
+// }
+assertTrue(Debug.showBreakPoints(g).indexOf("[B0]b=2;") > 0);
+bp2 = Debug.setBreakPoint(g, 1, 0);
+// function g() {
+//   [B0]a=1;
+//   [B1]b=2;
+// }
+assertTrue(Debug.showBreakPoints(g).indexOf("[B0]a=1;") > 0);
+assertTrue(Debug.showBreakPoints(g).indexOf("[B1]b=2;") > 0);
+bp3 = Debug.setBreakPoint(g, 3, 0);
+// function g() {
+//   [B0]a=1;
+//   [B1]b=2;
+// }[B2]
+assertTrue(Debug.showBreakPoints(g).indexOf("[B0]a=1;") > 0);
+assertTrue(Debug.showBreakPoints(g).indexOf("[B1]b=2;") > 0);
+assertTrue(Debug.showBreakPoints(g).indexOf("}[B2]") > 0);
+Debug.clearBreakPoint(bp1);
+// function g() {
+//   [B0]a=1;
+//   b=2;
+// }[B1]
+assertTrue(Debug.showBreakPoints(g).indexOf("[B0]a=1;") > 0);
+assertTrue(Debug.showBreakPoints(g).indexOf("}[B1]") > 0);
+assertTrue(Debug.showBreakPoints(g).indexOf("[B2]") < 0);
+Debug.clearBreakPoint(bp2);
+// function g() {
+//   a=1;
+//   b=2;
+// }[B0]
+assertTrue(Debug.showBreakPoints(g).indexOf("}[B0]") > 0);
+assertTrue(Debug.showBreakPoints(g).indexOf("[B1]") < 0);
+Debug.clearBreakPoint(bp3);
+// function g() {
+//   a=1;
+//   b=2;
+// }
+assertTrue(Debug.showBreakPoints(g).indexOf("[B0]") < 0);