Bug 1028418 - Part 6: Fix GC + SavedFrame test that made assumptions that are no longer true; r=shu

const FUZZ_FACTOR = 3;

function assertAboutEq(actual, expected) {

  if (Math.abs(actual - expected) > FUZZ_FACTOR)

    throw new Error("Assertion failed: expected about " + expected + ", got " + actual +

                    ". FUZZ_FACTOR = " + FUZZ_FACTOR);

function isAboutEq(actual, expected) {

  return Math.abs(actual - expected) <= FUZZ_FACTOR;

}

var stacks = [];

(function () {

  // Use an IIFE here so that we don't keep these saved stacks alive in the

  // frame cache when we test that they all go away at the end of the test.

  var startCount = getSavedFrameCount();

  print("startCount = " + startCount);

  stacks.push(saveStack());

  stacks.push(saveStack());

  stacks.push(saveStack());

  stacks.push(saveStack());

  stacks.push(saveStack());

assertAboutEq(getSavedFrameCount(), 50);

  gc();

  var endCount = getSavedFrameCount();

  print("endCount = " + endCount);

  assertEq(isAboutEq(endCount - startCount, 50), true);

}());

while (stacks.length) {

  stacks.pop();

stacks = null;

gc();

assertAboutEq(getSavedFrameCount(), 0);

assertEq(isAboutEq(getSavedFrameCount(), 0), true);