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// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"./a"
"fmt"
"math"
"strings"
)
type Integer interface {
~int | ~int8 | ~int16 | ~int32 | ~int64 |
~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 | ~uintptr
}
func TestEqual() {
s1 := []int{1, 2, 3}
if !a.Equal(s1, s1) {
panic(fmt.Sprintf("a.Equal(%v, %v) = false, want true", s1, s1))
}
s2 := []int{1, 2, 3}
if !a.Equal(s1, s2) {
panic(fmt.Sprintf("a.Equal(%v, %v) = false, want true", s1, s2))
}
s2 = append(s2, 4)
if a.Equal(s1, s2) {
panic(fmt.Sprintf("a.Equal(%v, %v) = true, want false", s1, s2))
}
s3 := []float64{1, 2, math.NaN()}
if !a.Equal(s3, s3) {
panic(fmt.Sprintf("a.Equal(%v, %v) = false, want true", s3, s3))
}
if a.Equal(s1, nil) {
panic(fmt.Sprintf("a.Equal(%v, nil) = true, want false", s1))
}
if a.Equal(nil, s1) {
panic(fmt.Sprintf("a.Equal(nil, %v) = true, want false", s1))
}
if !a.Equal(s1[:0], nil) {
panic(fmt.Sprintf("a.Equal(%v, nil = false, want true", s1[:0]))
}
}
func offByOne[Elem Integer](a, b Elem) bool {
return a == b+1 || a == b-1
}
func TestEqualFn() {
s1 := []int{1, 2, 3}
s2 := []int{2, 3, 4}
if a.EqualFn(s1, s1, offByOne[int]) {
panic(fmt.Sprintf("a.EqualFn(%v, %v, offByOne) = true, want false", s1, s1))
}
if !a.EqualFn(s1, s2, offByOne[int]) {
panic(fmt.Sprintf("a.EqualFn(%v, %v, offByOne) = false, want true", s1, s2))
}
if !a.EqualFn(s1[:0], nil, offByOne[int]) {
panic(fmt.Sprintf("a.EqualFn(%v, nil, offByOne) = false, want true", s1[:0]))
}
s3 := []string{"a", "b", "c"}
s4 := []string{"A", "B", "C"}
if !a.EqualFn(s3, s4, strings.EqualFold) {
panic(fmt.Sprintf("a.EqualFn(%v, %v, strings.EqualFold) = false, want true", s3, s4))
}
}
func TestMap() {
s1 := []int{1, 2, 3}
s2 := a.Map(s1, func(i int) float64 { return float64(i) * 2.5 })
if want := []float64{2.5, 5, 7.5}; !a.Equal(s2, want) {
panic(fmt.Sprintf("a.Map(%v, ...) = %v, want %v", s1, s2, want))
}
s3 := []string{"Hello", "World"}
s4 := a.Map(s3, strings.ToLower)
if want := []string{"hello", "world"}; !a.Equal(s4, want) {
panic(fmt.Sprintf("a.Map(%v, strings.ToLower) = %v, want %v", s3, s4, want))
}
s5 := a.Map(nil, func(i int) int { return i })
if len(s5) != 0 {
panic(fmt.Sprintf("a.Map(nil, identity) = %v, want empty slice", s5))
}
}
func TestReduce() {
s1 := []int{1, 2, 3}
r := a.Reduce(s1, 0, func(f float64, i int) float64 { return float64(i)*2.5 + f })
if want := 15.0; r != want {
panic(fmt.Sprintf("a.Reduce(%v, 0, ...) = %v, want %v", s1, r, want))
}
if got := a.Reduce(nil, 0, func(i, j int) int { return i + j }); got != 0 {
panic(fmt.Sprintf("a.Reduce(nil, 0, add) = %v, want 0", got))
}
}
func TestFilter() {
s1 := []int{1, 2, 3}
s2 := a.Filter(s1, func(i int) bool { return i%2 == 0 })
if want := []int{2}; !a.Equal(s2, want) {
panic(fmt.Sprintf("a.Filter(%v, even) = %v, want %v", s1, s2, want))
}
if s3 := a.Filter(s1[:0], func(i int) bool { return true }); len(s3) > 0 {
panic(fmt.Sprintf("a.Filter(%v, identity) = %v, want empty slice", s1[:0], s3))
}
}
func TestMax() {
s1 := []int{1, 2, 3, -5}
if got, want := a.SliceMax(s1), 3; got != want {
panic(fmt.Sprintf("a.Max(%v) = %d, want %d", s1, got, want))
}
s2 := []string{"aaa", "a", "aa", "aaaa"}
if got, want := a.SliceMax(s2), "aaaa"; got != want {
panic(fmt.Sprintf("a.Max(%v) = %q, want %q", s2, got, want))
}
if got, want := a.SliceMax(s2[:0]), ""; got != want {
panic(fmt.Sprintf("a.Max(%v) = %q, want %q", s2[:0], got, want))
}
}
func TestMin() {
s1 := []int{1, 2, 3, -5}
if got, want := a.SliceMin(s1), -5; got != want {
panic(fmt.Sprintf("a.Min(%v) = %d, want %d", s1, got, want))
}
s2 := []string{"aaa", "a", "aa", "aaaa"}
if got, want := a.SliceMin(s2), "a"; got != want {
panic(fmt.Sprintf("a.Min(%v) = %q, want %q", s2, got, want))
}
if got, want := a.SliceMin(s2[:0]), ""; got != want {
panic(fmt.Sprintf("a.Min(%v) = %q, want %q", s2[:0], got, want))
}
}
func TestAppend() {
s := []int{1, 2, 3}
s = a.Append(s, 4, 5, 6)
want := []int{1, 2, 3, 4, 5, 6}
if !a.Equal(s, want) {
panic(fmt.Sprintf("after a.Append got %v, want %v", s, want))
}
}
func TestCopy() {
s1 := []int{1, 2, 3}
s2 := []int{4, 5}
if got := a.Copy(s1, s2); got != 2 {
panic(fmt.Sprintf("a.Copy returned %d, want 2", got))
}
want := []int{4, 5, 3}
if !a.Equal(s1, want) {
panic(fmt.Sprintf("after a.Copy got %v, want %v", s1, want))
}
}
func main() {
TestEqual()
TestEqualFn()
TestMap()
TestReduce()
TestFilter()
TestMax()
TestMin()
TestAppend()
TestCopy()
}