test/mjsunit/regress/regress-102153.js

// Copyright 2012 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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// Flags: --expose-debug-as debug

// Test that the break point is set before initializing the loop variable
// so that we break before any iteration has been run.

Debug = debug.Debug;

var break_hit = false;

function listener(event, exec_state, event_data, data) {
  if (event == Debug.DebugEvent.Break) {
    break_hit = true;
  }
}

Debug.setListener(listener);

function test() {
  for (var i = 0; i < 3; i++) {  // Break here.
    if (i == 0) break;
  }
}

Debug.setBreakPoint(test, 1, 0);

assertTrue(Debug.showBreakPoints(test).indexOf("// Break here.") >= 0);

test();

assertTrue(break_hit);