Function near

lib/web/CodeMirror/test/driver.js:104–107

(a, b, margin, msg)

  if (a != b) throw new Failure(label(a + " != " + b, msg));
}
function near(a, b, margin, msg) {
  if (Math.abs(a - b) > margin)
    throw new Failure(label(a + " is not close to " + b + " (" + margin + ")", msg));
}
function eqCharPos(a, b, msg) {
  function str(p) { return "{line:" + p.line + ",ch:" + p.ch + ",sticky:" + p.sticky + "}"; }
  if (a == b) return;