[debugger] Further stepping support in test wrapper

test/mjsunit/debug-stepin-foreach.js

-// Copyright 2014 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Flags: --expose-debug-as debug
-// Tests stepping into through Array.prototype.forEach callbacks.
-
-Debug = debug.Debug
-var exception = null;
-var break_count = 0;
-var expected_breaks = -1;
-
-function listener(event, exec_state, event_data, data) {
-  try {
-    if (event == Debug.DebugEvent.Break) {
-      assertTrue(exec_state.frameCount() != 0, "FAIL: Empty stack trace");
-      if (!break_count) {
-        // Count number of expected breakpoints in this source file.
-        var source_text = exec_state.frame(0).func().script().source();
-        expected_breaks = source_text.match(/\/\/\s*Break\s+\d+\./g).length;
-        print("Expected breaks: " + expected_breaks);
-      }
-      var source = exec_state.frame(0).sourceLineText();
-      print("paused at: " + source);
-      assertTrue(source.indexOf("// Break " + break_count + ".") > 0,
-                 "Unexpected pause at: " + source + "\n" +
-                 "Expected: // Break " + break_count + ".");
-      ++break_count;
-      if (break_count !== expected_breaks) {
-        exec_state.prepareStep(Debug.StepAction.StepIn);
-      }
-    }
-  } catch(e) {
-    exception = e;
-    print(e, e.stack);
-  }
-};
-
-Debug.setListener(listener);
-var bound_callback = callback.bind(null);
-
-debugger; // Break 0.
-[1,2].forEach(callback); // Break 1.
-[3,4].forEach(bound_callback); // Break 6.
-
-function callback(x) {
-  return x; // Break 2. // Break 4. // Break 7. // Break 9.
-} // Break 3. // Break 5. // Break 8. // Break 10.
-
-assertNull(exception); // Break 11.
-assertEquals(expected_breaks, break_count);
-
-Debug.setListener(null);