mirror of
https://github.com/autc04/Retro68.git
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308 lines
6.0 KiB
Go
308 lines
6.0 KiB
Go
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// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package strings_test
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import (
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"bytes"
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"runtime"
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. "strings"
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"testing"
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)
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func check(t *testing.T, b *Builder, want string) {
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t.Helper()
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got := b.String()
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if got != want {
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t.Errorf("String: got %#q; want %#q", got, want)
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return
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}
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if n := b.Len(); n != len(got) {
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t.Errorf("Len: got %d; but len(String()) is %d", n, len(got))
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}
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}
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func TestBuilder(t *testing.T) {
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var b Builder
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check(t, &b, "")
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n, err := b.WriteString("hello")
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if err != nil || n != 5 {
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t.Errorf("WriteString: got %d,%s; want 5,nil", n, err)
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}
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check(t, &b, "hello")
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if err = b.WriteByte(' '); err != nil {
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t.Errorf("WriteByte: %s", err)
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}
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check(t, &b, "hello ")
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n, err = b.WriteString("world")
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if err != nil || n != 5 {
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t.Errorf("WriteString: got %d,%s; want 5,nil", n, err)
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}
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check(t, &b, "hello world")
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}
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func TestBuilderString(t *testing.T) {
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var b Builder
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b.WriteString("alpha")
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check(t, &b, "alpha")
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s1 := b.String()
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b.WriteString("beta")
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check(t, &b, "alphabeta")
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s2 := b.String()
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b.WriteString("gamma")
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check(t, &b, "alphabetagamma")
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s3 := b.String()
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// Check that subsequent operations didn't change the returned strings.
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if want := "alpha"; s1 != want {
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t.Errorf("first String result is now %q; want %q", s1, want)
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}
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if want := "alphabeta"; s2 != want {
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t.Errorf("second String result is now %q; want %q", s2, want)
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}
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if want := "alphabetagamma"; s3 != want {
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t.Errorf("third String result is now %q; want %q", s3, want)
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}
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}
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func TestBuilderReset(t *testing.T) {
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var b Builder
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check(t, &b, "")
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b.WriteString("aaa")
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s := b.String()
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check(t, &b, "aaa")
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b.Reset()
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check(t, &b, "")
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// Ensure that writing after Reset doesn't alter
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// previously returned strings.
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b.WriteString("bbb")
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check(t, &b, "bbb")
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if want := "aaa"; s != want {
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t.Errorf("previous String result changed after Reset: got %q; want %q", s, want)
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}
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}
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func TestBuilderGrow(t *testing.T) {
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for _, growLen := range []int{0, 100, 1000, 10000, 100000} {
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var b Builder
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b.Grow(growLen)
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p := bytes.Repeat([]byte{'a'}, growLen)
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allocs := numAllocs(func() { b.Write(p) })
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if allocs > 0 {
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t.Errorf("growLen=%d: allocation occurred during write", growLen)
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}
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if b.String() != string(p) {
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t.Errorf("growLen=%d: bad data written after Grow", growLen)
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}
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}
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}
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func TestBuilderWrite2(t *testing.T) {
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const s0 = "hello 世界"
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for _, tt := range []struct {
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name string
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fn func(b *Builder) (int, error)
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n int
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want string
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}{
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{
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"Write",
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func(b *Builder) (int, error) { return b.Write([]byte(s0)) },
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len(s0),
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s0,
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},
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{
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"WriteRune",
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func(b *Builder) (int, error) { return b.WriteRune('a') },
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1,
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"a",
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},
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{
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"WriteRuneWide",
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func(b *Builder) (int, error) { return b.WriteRune('世') },
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3,
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"世",
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},
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{
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"WriteString",
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func(b *Builder) (int, error) { return b.WriteString(s0) },
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len(s0),
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s0,
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},
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} {
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t.Run(tt.name, func(t *testing.T) {
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var b Builder
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n, err := tt.fn(&b)
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if err != nil {
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t.Fatalf("first call: got %s", err)
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}
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if n != tt.n {
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t.Errorf("first call: got n=%d; want %d", n, tt.n)
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}
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check(t, &b, tt.want)
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n, err = tt.fn(&b)
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if err != nil {
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t.Fatalf("second call: got %s", err)
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}
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if n != tt.n {
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t.Errorf("second call: got n=%d; want %d", n, tt.n)
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}
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check(t, &b, tt.want+tt.want)
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})
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}
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}
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func TestBuilderWriteByte(t *testing.T) {
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var b Builder
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if err := b.WriteByte('a'); err != nil {
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t.Error(err)
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}
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if err := b.WriteByte(0); err != nil {
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t.Error(err)
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}
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check(t, &b, "a\x00")
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}
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func TestBuilderAllocs(t *testing.T) {
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if runtime.Compiler == "gccgo" {
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t.Skip("skip for gccgo until escape analysis enabled by default")
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}
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var b Builder
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b.Grow(5)
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var s string
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allocs := numAllocs(func() {
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b.WriteString("hello")
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s = b.String()
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})
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if want := "hello"; s != want {
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t.Errorf("String: got %#q; want %#q", s, want)
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}
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if allocs > 0 {
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t.Fatalf("got %d alloc(s); want 0", allocs)
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}
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// Issue 23382; verify that copyCheck doesn't force the
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// Builder to escape and be heap allocated.
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n := testing.AllocsPerRun(10000, func() {
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var b Builder
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b.Grow(5)
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b.WriteString("abcde")
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_ = b.String()
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})
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if n != 1 {
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t.Errorf("Builder allocs = %v; want 1", n)
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}
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}
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func numAllocs(fn func()) uint64 {
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defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(1))
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var m1, m2 runtime.MemStats
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runtime.ReadMemStats(&m1)
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fn()
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runtime.ReadMemStats(&m2)
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return m2.Mallocs - m1.Mallocs
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}
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func TestBuilderCopyPanic(t *testing.T) {
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tests := []struct {
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name string
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fn func()
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wantPanic bool
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}{
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{
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name: "String",
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wantPanic: false,
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fn: func() {
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var a Builder
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a.WriteByte('x')
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b := a
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_ = b.String() // appease vet
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},
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},
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{
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name: "Len",
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wantPanic: false,
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fn: func() {
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var a Builder
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a.WriteByte('x')
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b := a
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b.Len()
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},
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},
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{
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name: "Reset",
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wantPanic: false,
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fn: func() {
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var a Builder
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a.WriteByte('x')
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b := a
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b.Reset()
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b.WriteByte('y')
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},
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},
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{
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name: "Write",
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wantPanic: true,
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fn: func() {
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var a Builder
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a.Write([]byte("x"))
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b := a
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b.Write([]byte("y"))
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},
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},
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{
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name: "WriteByte",
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wantPanic: true,
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fn: func() {
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var a Builder
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a.WriteByte('x')
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b := a
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b.WriteByte('y')
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},
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},
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{
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name: "WriteString",
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wantPanic: true,
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fn: func() {
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var a Builder
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a.WriteString("x")
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b := a
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b.WriteString("y")
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},
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},
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{
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name: "WriteRune",
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wantPanic: true,
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fn: func() {
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var a Builder
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a.WriteRune('x')
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b := a
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b.WriteRune('y')
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},
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},
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{
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name: "Grow",
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wantPanic: true,
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fn: func() {
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var a Builder
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a.Grow(1)
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b := a
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b.Grow(2)
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},
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},
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}
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for _, tt := range tests {
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didPanic := make(chan bool)
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go func() {
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defer func() { didPanic <- recover() != nil }()
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tt.fn()
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}()
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if got := <-didPanic; got != tt.wantPanic {
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t.Errorf("%s: panicked = %v; want %v", tt.name, got, tt.wantPanic)
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}
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}
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}
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