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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 maps
import (
"math"
"sort"
"strconv"
"testing"
"golang.org/x/exp/slices"
)
var m1 = map[int]int{1: 2, 2: 4, 4: 8, 8: 16}
var m2 = map[int]string{1: "2", 2: "4", 4: "8", 8: "16"}
func TestKeys(t *testing.T) {
want := []int{1, 2, 4, 8}
got1 := Keys(m1)
sort.Ints(got1)
if !slices.Equal(got1, want) {
t.Errorf("Keys(%v) = %v, want %v", m1, got1, want)
}
got2 := Keys(m2)
sort.Ints(got2)
if !slices.Equal(got2, want) {
t.Errorf("Keys(%v) = %v, want %v", m2, got2, want)
}
}
func TestValues(t *testing.T) {
got1 := Values(m1)
want1 := []int{2, 4, 8, 16}
sort.Ints(got1)
if !slices.Equal(got1, want1) {
t.Errorf("Values(%v) = %v, want %v", m1, got1, want1)
}
got2 := Values(m2)
want2 := []string{"16", "2", "4", "8"}
sort.Strings(got2)
if !slices.Equal(got2, want2) {
t.Errorf("Values(%v) = %v, want %v", m2, got2, want2)
}
}
func TestEqual(t *testing.T) {
if !Equal(m1, m1) {
t.Errorf("Equal(%v, %v) = false, want true", m1, m1)
}
if Equal(m1, (map[int]int)(nil)) {
t.Errorf("Equal(%v, nil) = true, want false", m1)
}
if Equal((map[int]int)(nil), m1) {
t.Errorf("Equal(nil, %v) = true, want false", m1)
}
if !Equal[map[int]int, map[int]int](nil, nil) {
t.Error("Equal(nil, nil) = false, want true")
}
if ms := map[int]int{1: 2}; Equal(m1, ms) {
t.Errorf("Equal(%v, %v) = true, want false", m1, ms)
}
// Comparing NaN for equality is expected to fail.
mf := map[int]float64{1: 0, 2: math.NaN()}
if Equal(mf, mf) {
t.Errorf("Equal(%v, %v) = true, want false", mf, mf)
}
}
// equal is simply ==.
func equal[T comparable](v1, v2 T) bool {
return v1 == v2
}
// equalNaN is like == except that all NaNs are equal.
func equalNaN[T comparable](v1, v2 T) bool {
isNaN := func(f T) bool { return f != f }
return v1 == v2 || (isNaN(v1) && isNaN(v2))
}
// equalStr compares ints and strings.
func equalIntStr(v1 int, v2 string) bool {
return strconv.Itoa(v1) == v2
}
func TestEqualFunc(t *testing.T) {
if !EqualFunc(m1, m1, equal[int]) {
t.Errorf("EqualFunc(%v, %v, equal) = false, want true", m1, m1)
}
if EqualFunc(m1, (map[int]int)(nil), equal[int]) {
t.Errorf("EqualFunc(%v, nil, equal) = true, want false", m1)
}
if EqualFunc((map[int]int)(nil), m1, equal[int]) {
t.Errorf("EqualFunc(nil, %v, equal) = true, want false", m1)
}
if !EqualFunc[map[int]int, map[int]int](nil, nil, equal[int]) {
t.Error("EqualFunc(nil, nil, equal) = false, want true")
}
if ms := map[int]int{1: 2}; EqualFunc(m1, ms, equal[int]) {
t.Errorf("EqualFunc(%v, %v, equal) = true, want false", m1, ms)
}
// Comparing NaN for equality is expected to fail.
mf := map[int]float64{1: 0, 2: math.NaN()}
if EqualFunc(mf, mf, equal[float64]) {
t.Errorf("EqualFunc(%v, %v, equal) = true, want false", mf, mf)
}
// But it should succeed using equalNaN.
if !EqualFunc(mf, mf, equalNaN[float64]) {
t.Errorf("EqualFunc(%v, %v, equalNaN) = false, want true", mf, mf)
}
if !EqualFunc(m1, m2, equalIntStr) {
t.Errorf("EqualFunc(%v, %v, equalIntStr) = false, want true", m1, m2)
}
}
func TestClear(t *testing.T) {
ml := map[int]int{1: 1, 2: 2, 3: 3}
Clear(ml)
if got := len(ml); got != 0 {
t.Errorf("len(%v) = %d after Clear, want 0", ml, got)
}
if !Equal(ml, (map[int]int)(nil)) {
t.Errorf("Equal(%v, nil) = false, want true", ml)
}
}
func TestClone(t *testing.T) {
mc := Clone(m1)
if !Equal(mc, m1) {
t.Errorf("Clone(%v) = %v, want %v", m1, mc, m1)
}
mc[16] = 32
if Equal(mc, m1) {
t.Errorf("Equal(%v, %v) = true, want false", mc, m1)
}
}
func TestCloneNil(t *testing.T) {
var m1 map[string]int
mc := Clone(m1)
if mc != nil {
t.Errorf("Clone(%v) = %v, want %v", m1, mc, m1)
}
}
func TestCopy(t *testing.T) {
mc := Clone(m1)
Copy(mc, mc)
if !Equal(mc, m1) {
t.Errorf("Copy(%v, %v) = %v, want %v", m1, m1, mc, m1)
}
Copy(mc, map[int]int{16: 32})
want := map[int]int{1: 2, 2: 4, 4: 8, 8: 16, 16: 32}
if !Equal(mc, want) {
t.Errorf("Copy result = %v, want %v", mc, want)
}
type M1 map[int]bool
type M2 map[int]bool
Copy(make(M1), make(M2))
}
func TestDeleteFunc(t *testing.T) {
mc := Clone(m1)
DeleteFunc(mc, func(int, int) bool { return false })
if !Equal(mc, m1) {
t.Errorf("DeleteFunc(%v, true) = %v, want %v", m1, mc, m1)
}
DeleteFunc(mc, func(k, v int) bool { return k > 3 })
want := map[int]int{1: 2, 2: 4}
if !Equal(mc, want) {
t.Errorf("DeleteFunc result = %v, want %v", mc, want)
}
}
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