tests for variadic functions

[Alex Dvoretskiy]

How do you write test for variadic functions?

For example I have function:

func max(vals ...int) int {

m := 0

for _, v := range vals {

if v > m {

m = v

}

return m

}

and how to write a few tests for it? I can't put vals ...int

in struct

package main

import (

"testing"

)

func TestMax(t *testing.T) {

var tests = []struct {

vals ...int

want int

}{

{[]int{1,2,3}, 3},

{[]int{-1,0}, -1},

{[]int{0}, 0},

}

for _, test := range tests {

if got := max(test.vals); got !=test.want {

t.Errorf("max(%d) = %d", test.vals, got)

}

}

}

[Alex Dvoretskiy]

I got it!

max(test.vals...)

[Caleb Spare]

The struct field should be vals []int and then you'd call max(test.vals...).​

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[Josh Humphries]

The syntax you are looking for is:

   max(test.vals...) 

The ellipsis indicates that the var args are the contents of the slice, as opposed to trying to pass the slice as if it were just a single element of the var args.

----
Josh Humphries
jh...@bluegosling.com

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