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// Copyright 2020 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 json
import (
"math"
"reflect"
"testing"
)
func TestTokenStringAllocations(t *testing.T) {
if testing.CoverMode() != "" {
t.Skip("coverage mode breaks the compiler optimization this depends on")
}
tok := rawToken(`"hello"`)
var m map[string]bool
got := int(testing.AllocsPerRun(10, func() {
// This function uses tok.String() is a non-escaping manner
// (i.e., looking it up in a Go map). It should not allocate.
if m[tok.String()] {
panic("never executed")
}
}))
if got > 0 {
t.Errorf("Token.String allocated %d times, want 0", got)
}
}
func TestTokenAccessors(t *testing.T) {
type token struct {
Bool bool
String string
Float float64
Int int64
Uint uint64
Kind Kind
}
tests := []struct {
in Token
want token
}{
{Token{}, token{String: "<invalid json.Token>"}},
{Null, token{String: "null", Kind: 'n'}},
{False, token{Bool: false, String: "false", Kind: 'f'}},
{True, token{Bool: true, String: "true", Kind: 't'}},
{Bool(false), token{Bool: false, String: "false", Kind: 'f'}},
{Bool(true), token{Bool: true, String: "true", Kind: 't'}},
{ObjectStart, token{String: "{", Kind: '{'}},
{ObjectEnd, token{String: "}", Kind: '}'}},
{ArrayStart, token{String: "[", Kind: '['}},
{ArrayEnd, token{String: "]", Kind: ']'}},
{String(""), token{String: "", Kind: '"'}},
{String("hello, world!"), token{String: "hello, world!", Kind: '"'}},
{rawToken(`"hello, world!"`), token{String: "hello, world!", Kind: '"'}},
{Float(0), token{String: "0", Float: 0, Int: 0, Uint: 0, Kind: '0'}},
{Float(math.Copysign(0, -1)), token{String: "-0", Float: math.Copysign(0, -1), Int: 0, Uint: 0, Kind: '0'}},
{Float(math.NaN()), token{String: "NaN", Float: math.NaN(), Int: 0, Uint: 0, Kind: '"'}},
{Float(math.Inf(+1)), token{String: "Infinity", Float: math.Inf(+1), Kind: '"'}},
{Float(math.Inf(-1)), token{String: "-Infinity", Float: math.Inf(-1), Kind: '"'}},
{Int(minInt64), token{String: "-9223372036854775808", Float: minInt64, Int: minInt64, Uint: minUint64, Kind: '0'}},
{Int(minInt64 + 1), token{String: "-9223372036854775807", Float: minInt64 + 1, Int: minInt64 + 1, Uint: minUint64, Kind: '0'}},
{Int(-1), token{String: "-1", Float: -1, Int: -1, Uint: minUint64, Kind: '0'}},
{Int(0), token{String: "0", Float: 0, Int: 0, Uint: 0, Kind: '0'}},
{Int(+1), token{String: "1", Float: +1, Int: +1, Uint: +1, Kind: '0'}},
{Int(maxInt64 - 1), token{String: "9223372036854775806", Float: maxInt64 - 1, Int: maxInt64 - 1, Uint: maxInt64 - 1, Kind: '0'}},
{Int(maxInt64), token{String: "9223372036854775807", Float: maxInt64, Int: maxInt64, Uint: maxInt64, Kind: '0'}},
{Uint(minUint64), token{String: "0", Kind: '0'}},
{Uint(minUint64 + 1), token{String: "1", Float: minUint64 + 1, Int: minUint64 + 1, Uint: minUint64 + 1, Kind: '0'}},
{Uint(maxUint64 - 1), token{String: "18446744073709551614", Float: maxUint64 - 1, Int: maxInt64, Uint: maxUint64 - 1, Kind: '0'}},
{Uint(maxUint64), token{String: "18446744073709551615", Float: maxUint64, Int: maxInt64, Uint: maxUint64, Kind: '0'}},
{rawToken(`-0`), token{String: "-0", Float: math.Copysign(0, -1), Int: 0, Uint: 0, Kind: '0'}},
{rawToken(`1e1000`), token{String: "1e1000", Float: math.MaxFloat64, Int: maxInt64, Uint: maxUint64, Kind: '0'}},
{rawToken(`-1e1000`), token{String: "-1e1000", Float: -math.MaxFloat64, Int: minInt64, Uint: minUint64, Kind: '0'}},
{rawToken(`0.1`), token{String: "0.1", Float: 0.1, Int: 0, Uint: 0, Kind: '0'}},
{rawToken(`0.5`), token{String: "0.5", Float: 0.5, Int: 0, Uint: 0, Kind: '0'}},
{rawToken(`0.9`), token{String: "0.9", Float: 0.9, Int: 0, Uint: 0, Kind: '0'}},
{rawToken(`1.1`), token{String: "1.1", Float: 1.1, Int: 1, Uint: 1, Kind: '0'}},
{rawToken(`-0.1`), token{String: "-0.1", Float: -0.1, Int: 0, Uint: 0, Kind: '0'}},
{rawToken(`-0.5`), token{String: "-0.5", Float: -0.5, Int: 0, Uint: 0, Kind: '0'}},
{rawToken(`-0.9`), token{String: "-0.9", Float: -0.9, Int: 0, Uint: 0, Kind: '0'}},
{rawToken(`-1.1`), token{String: "-1.1", Float: -1.1, Int: -1, Uint: 0, Kind: '0'}},
{rawToken(`99999999999999999999`), token{String: "99999999999999999999", Float: 1e20 - 1, Int: maxInt64, Uint: maxUint64, Kind: '0'}},
{rawToken(`-99999999999999999999`), token{String: "-99999999999999999999", Float: -1e20 - 1, Int: minInt64, Uint: minUint64, Kind: '0'}},
}
for _, tt := range tests {
t.Run("", func(t *testing.T) {
got := token{
Bool: func() bool {
defer func() { recover() }()
return tt.in.Bool()
}(),
String: tt.in.String(),
Float: func() float64 {
defer func() { recover() }()
return tt.in.Float()
}(),
Int: func() int64 {
defer func() { recover() }()
return tt.in.Int()
}(),
Uint: func() uint64 {
defer func() { recover() }()
return tt.in.Uint()
}(),
Kind: tt.in.Kind(),
}
if got.Bool != tt.want.Bool {
t.Errorf("Token(%s).Bool() = %v, want %v", tt.in, got.Bool, tt.want.Bool)
}
if got.String != tt.want.String {
t.Errorf("Token(%s).String() = %v, want %v", tt.in, got.String, tt.want.String)
}
if math.Float64bits(got.Float) != math.Float64bits(tt.want.Float) {
t.Errorf("Token(%s).Float() = %v, want %v", tt.in, got.Float, tt.want.Float)
}
if got.Int != tt.want.Int {
t.Errorf("Token(%s).Int() = %v, want %v", tt.in, got.Int, tt.want.Int)
}
if got.Uint != tt.want.Uint {
t.Errorf("Token(%s).Uint() = %v, want %v", tt.in, got.Uint, tt.want.Uint)
}
if got.Kind != tt.want.Kind {
t.Errorf("Token(%s).Kind() = %v, want %v", tt.in, got.Kind, tt.want.Kind)
}
})
}
}
func TestTokenClone(t *testing.T) {
tests := []struct {
in Token
wantExactRaw bool
}{
{Token{}, true},
{Null, true},
{False, true},
{True, true},
{ObjectStart, true},
{ObjectEnd, true},
{ArrayStart, true},
{ArrayEnd, true},
{String("hello, world!"), true},
{rawToken(`"hello, world!"`), false},
{Float(3.14159), true},
{rawToken(`3.14159`), false},
}
for _, tt := range tests {
t.Run("", func(t *testing.T) {
got := tt.in.Clone()
if !reflect.DeepEqual(got, tt.in) {
t.Errorf("Token(%s) == Token(%s).Clone() = false, want true", tt.in, tt.in)
}
gotExactRaw := got.raw == tt.in.raw
if gotExactRaw != tt.wantExactRaw {
t.Errorf("Token(%s).raw == Token(%s).Clone().raw = %v, want %v", tt.in, tt.in, gotExactRaw, tt.wantExactRaw)
}
})
}
}
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