Within Delta Checker for floats

Bug #1131537 reported by Nathan Youngman on 2013-02-22
This bug affects 2 people
Affects Status Importance Assigned to Milestone

Bug Description

How about including a Within checker, something like what follows?

Here's an example of it in use: https://github.com/nathany/go-poodr/blob/master/chapter9/gear1/gear1_check_test.go

type withinChecker struct {

var Within Checker = &withinChecker{
  &CheckerInfo{Name: "Within", Params: []string{"obtained", "delta", "expected"}},

func (c *withinChecker) Check(params []interface{}, names []string) (result bool, error string) {
  obtained, ok := params[0].(float64)
  if !ok {
    return false, "obtained must be a float64"
  delta, ok := params[1].(float64)
  if !ok {
    return false, "delta must be a float64"
  expected, ok := params[2].(float64)
  if !ok {
    return false, "expected must be a float64"
  return math.Abs(obtained-expected) <= delta, ""

# https://gist.github.com/nathany/4238394

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