// Float64Shrinker is a shrinker for float64 numbers
func Float64Shrinker(v interface{}) gopter.Shrink {
negShrink := float64Shrink{
original: -v.(float64),
half: -v.(float64),
}
posShrink := float64Shrink{
original: v.(float64),
half: v.(float64) / 2,
}
return gopter.Shrink(negShrink.Next).Interleave(gopter.Shrink(posShrink.Next))
}
// TimeShrinker is a shrinker for time.Time structs
func TimeShrinker(v interface{}) gopter.Shrink {
t := v.(time.Time)
sec := t.Unix()
nsec := int64(t.Nanosecond())
secShrink := int64Shrink{
original: sec,
half: sec,
}
nsecShrink := int64Shrink{
original: nsec,
half: nsec,
}
return gopter.Shrink(secShrink.Next).Map(func(v interface{}) interface{} {
return time.Unix(v.(int64), nsec)
}).Interleave(gopter.Shrink(nsecShrink.Next).Map(func(v interface{}) interface{} {
return time.Unix(sec, v.(int64))
}))
}