Go Testing Example

sort_test.go

// filename sort_test.go
package main

import (
	"reflect"
	"sort"
	"testing"
)

func SortAscending(items []int) []int {
	sort.Slice(items, func(i, j int) bool {
		return items[i] < items[j]
	})
	return items
}

func TestLastIndex(t *testing.T) {
	tests := []struct {
		list []int
		want []int
	}{
		{list: []int{1}, want: []int{1}},
		{list: []int{1, 1}, want: []int{1, 1}},
		{list: []int{2, 1}, want: []int{1, 2}},
		{list: []int{1, 2, 1, 1}, want: []int{1, 1, 1, 2}},
		{list: []int{1, 1, 1, 2, 2, 1}, want: []int{1, 1, 1, 1, 2, 2}},
		{list: []int{3, 1, 2, 2, 1, 1}, want: []int{1, 1, 1, 2, 2, 3}},
		{list: []int{10, 9, 8, 7, 6, 5, 4, 3, 2, 1}, want: []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}},
		{list: []int{9999, 999, 9}, want: []int{9, 999, 9999}},
	}
	for _, tt := range tests {
		if got := SortAscending(tt.list); !reflect.DeepEqual(got, tt.want) {
			t.Errorf("LastIndex(%v) = %v, want %v", tt.list, got, tt.want)
		}
	}
}