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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"
"strconv"
"testing"
)
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 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 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)
}
}
var n map[int]int
func BenchmarkMapClone(b *testing.B) {
var m = make(map[int]int)
for i := 0; i < 1000000; i++ {
m[i] = i
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
n = Clone(m)
}
}
func TestCloneWithDelete(t *testing.T) {
var m = make(map[int]int)
for i := 0; i < 32; i++ {
m[i] = i
}
for i := 8; i < 32; i++ {
delete(m, i)
}
m2 := Clone(m)
if len(m2) != 8 {
t.Errorf("len2(m2) = %d, want %d", len(m2), 8)
}
for i := 0; i < 8; i++ {
if m2[i] != m[i] {
t.Errorf("m2[%d] = %d, want %d", i, m2[i], m[i])
}
}
}
func TestCloneWithMapAssign(t *testing.T) {
var m = make(map[int]int)
const N = 25
for i := 0; i < N; i++ {
m[i] = i
}
m2 := Clone(m)
if len(m2) != N {
t.Errorf("len2(m2) = %d, want %d", len(m2), N)
}
for i := 0; i < N; i++ {
if m2[i] != m[i] {
t.Errorf("m2[%d] = %d, want %d", i, m2[i], m[i])
}
}
}
func TestCloneLarge(t *testing.T) {
// See issue 64474.
type K [17]float64 // > 128 bytes
type V [17]float64
var zero float64
negZero := -zero
for tst := 0; tst < 3; tst++ {
// Initialize m with a key and value.
m := map[K]V{}
var k1 K
var v1 V
m[k1] = v1
switch tst {
case 0: // nothing, just a 1-entry map
case 1:
// Add more entries to make it 2 buckets
// 1 entry already
// 7 more fill up 1 bucket
// 1 more to grow to 2 buckets
for i := 0; i < 7+1; i++ {
m[K{float64(i) + 1}] = V{}
}
case 2:
// Capture the map mid-grow
// 1 entry already
// 7 more fill up 1 bucket
// 5 more (13 total) fill up 2 buckets
// 13 more (26 total) fill up 4 buckets
// 1 more to start the 4->8 bucket grow
for i := 0; i < 7+5+13+1; i++ {
m[K{float64(i) + 1}] = V{}
}
}
// Clone m, which should freeze the map's contents.
c := Clone(m)
// Update m with new key and value.
k2, v2 := k1, v1
k2[0] = negZero
v2[0] = 1.0
m[k2] = v2
// Make sure c still has its old key and value.
for k, v := range c {
if math.Signbit(k[0]) {
t.Errorf("tst%d: sign bit of key changed; got %v want %v", tst, k, k1)
}
if v != v1 {
t.Errorf("tst%d: value changed; got %v want %v", tst, v, v1)
}
}
}
}
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