code: func InDelta(t TestingT, expected interface{}, actual interface{}, delta float64, msgAndArgs ...interface{}) {
  	if h, ok := t.(tHelper); ok {
  		h.Helper()
  	}
  	if assert.InDelta(t, expected, actual, delta, msgAndArgs...) {
  		return
  	}
  	t.FailNow()
  }
docs: // InDelta asserts that the two numerals are within delta of each other.
  //
  // 	 assert.InDelta(t, math.Pi, (22 / 7.0), 0.01)