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