304 lines
6.1 KiB
Go
304 lines
6.1 KiB
Go
// Copyright 2010 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 json
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import (
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"bytes"
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"math"
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"math/rand"
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"reflect"
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"testing"
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)
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// Tests of simple examples.
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type example struct {
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compact string
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indent string
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}
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var examples = []example{
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{`1`, `1`},
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{`{}`, `{}`},
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{`[]`, `[]`},
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{`{"":2}`, "{\n\t\"\": 2\n}"},
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{`[3]`, "[\n\t3\n]"},
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{`[1,2,3]`, "[\n\t1,\n\t2,\n\t3\n]"},
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{`{"x":1}`, "{\n\t\"x\": 1\n}"},
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{ex1, ex1i},
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}
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var ex1 = `[true,false,null,"x",1,1.5,0,-5e+2]`
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var ex1i = `[
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true,
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false,
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null,
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"x",
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1,
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1.5,
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0,
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-5e+2
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]`
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func TestCompact(t *testing.T) {
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var buf bytes.Buffer
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for _, tt := range examples {
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buf.Reset()
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if err := Compact(&buf, []byte(tt.compact)); err != nil {
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t.Errorf("Compact(%#q): %v", tt.compact, err)
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} else if s := buf.String(); s != tt.compact {
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t.Errorf("Compact(%#q) = %#q, want original", tt.compact, s)
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}
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buf.Reset()
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if err := Compact(&buf, []byte(tt.indent)); err != nil {
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t.Errorf("Compact(%#q): %v", tt.indent, err)
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continue
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} else if s := buf.String(); s != tt.compact {
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t.Errorf("Compact(%#q) = %#q, want %#q", tt.indent, s, tt.compact)
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}
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}
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}
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func TestIndent(t *testing.T) {
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var buf bytes.Buffer
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for _, tt := range examples {
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buf.Reset()
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if err := Indent(&buf, []byte(tt.indent), "", "\t"); err != nil {
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t.Errorf("Indent(%#q): %v", tt.indent, err)
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} else if s := buf.String(); s != tt.indent {
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t.Errorf("Indent(%#q) = %#q, want original", tt.indent, s)
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}
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buf.Reset()
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if err := Indent(&buf, []byte(tt.compact), "", "\t"); err != nil {
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t.Errorf("Indent(%#q): %v", tt.compact, err)
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continue
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} else if s := buf.String(); s != tt.indent {
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t.Errorf("Indent(%#q) = %#q, want %#q", tt.compact, s, tt.indent)
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}
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}
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}
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// Tests of a large random structure.
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func TestCompactBig(t *testing.T) {
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initBig()
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var buf bytes.Buffer
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if err := Compact(&buf, jsonBig); err != nil {
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t.Fatalf("Compact: %v", err)
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}
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b := buf.Bytes()
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if bytes.Compare(b, jsonBig) != 0 {
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t.Error("Compact(jsonBig) != jsonBig")
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diff(t, b, jsonBig)
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return
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}
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}
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func TestIndentBig(t *testing.T) {
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initBig()
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var buf bytes.Buffer
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if err := Indent(&buf, jsonBig, "", "\t"); err != nil {
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t.Fatalf("Indent1: %v", err)
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}
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b := buf.Bytes()
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if len(b) == len(jsonBig) {
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// jsonBig is compact (no unnecessary spaces);
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// indenting should make it bigger
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t.Fatalf("Indent(jsonBig) did not get bigger")
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}
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// should be idempotent
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var buf1 bytes.Buffer
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if err := Indent(&buf1, b, "", "\t"); err != nil {
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t.Fatalf("Indent2: %v", err)
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}
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b1 := buf1.Bytes()
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if bytes.Compare(b1, b) != 0 {
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t.Error("Indent(Indent(jsonBig)) != Indent(jsonBig)")
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diff(t, b1, b)
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return
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}
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// should get back to original
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buf1.Reset()
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if err := Compact(&buf1, b); err != nil {
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t.Fatalf("Compact: %v", err)
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}
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b1 = buf1.Bytes()
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if bytes.Compare(b1, jsonBig) != 0 {
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t.Error("Compact(Indent(jsonBig)) != jsonBig")
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diff(t, b1, jsonBig)
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return
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}
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}
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type indentErrorTest struct {
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in string
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err error
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}
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var indentErrorTests = []indentErrorTest{
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{`{"X": "foo", "Y"}`, &SyntaxError{"invalid character '}' after object key", 17}},
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{`{"X": "foo" "Y": "bar"}`, &SyntaxError{"invalid character '\"' after object key:value pair", 13}},
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}
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func TestIndentErrors(t *testing.T) {
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for i, tt := range indentErrorTests {
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slice := make([]uint8, 0)
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buf := bytes.NewBuffer(slice)
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if err := Indent(buf, []uint8(tt.in), "", ""); err != nil {
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if !reflect.DeepEqual(err, tt.err) {
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t.Errorf("#%d: Indent: %#v", i, err)
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continue
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}
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}
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}
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}
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func TestNextValueBig(t *testing.T) {
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initBig()
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var scan scanner
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item, rest, err := nextValue(jsonBig, &scan)
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if err != nil {
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t.Fatalf("nextValue: %s", err)
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}
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if len(item) != len(jsonBig) || &item[0] != &jsonBig[0] {
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t.Errorf("invalid item: %d %d", len(item), len(jsonBig))
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}
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if len(rest) != 0 {
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t.Errorf("invalid rest: %d", len(rest))
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}
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item, rest, err = nextValue(append(jsonBig, "HELLO WORLD"...), &scan)
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if err != nil {
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t.Fatalf("nextValue extra: %s", err)
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}
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if len(item) != len(jsonBig) {
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t.Errorf("invalid item: %d %d", len(item), len(jsonBig))
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}
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if string(rest) != "HELLO WORLD" {
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t.Errorf("invalid rest: %d", len(rest))
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}
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}
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var benchScan scanner
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func BenchmarkSkipValue(b *testing.B) {
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initBig()
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for i := 0; i < b.N; i++ {
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nextValue(jsonBig, &benchScan)
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}
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b.SetBytes(int64(len(jsonBig)))
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}
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func diff(t *testing.T, a, b []byte) {
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for i := 0; ; i++ {
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if i >= len(a) || i >= len(b) || a[i] != b[i] {
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j := i - 10
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if j < 0 {
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j = 0
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}
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t.Errorf("diverge at %d: «%s» vs «%s»", i, trim(a[j:]), trim(b[j:]))
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return
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}
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}
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}
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func trim(b []byte) []byte {
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if len(b) > 20 {
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return b[0:20]
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}
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return b
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}
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// Generate a random JSON object.
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var jsonBig []byte
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const (
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big = 10000
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small = 100
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)
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func initBig() {
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n := big
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if testing.Short() {
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n = small
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}
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if len(jsonBig) != n {
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b, err := Marshal(genValue(n))
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if err != nil {
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panic(err)
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}
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jsonBig = b
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}
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}
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func genValue(n int) interface{} {
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if n > 1 {
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switch rand.Intn(2) {
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case 0:
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return genArray(n)
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case 1:
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return genMap(n)
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}
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}
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switch rand.Intn(3) {
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case 0:
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return rand.Intn(2) == 0
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case 1:
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return rand.NormFloat64()
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case 2:
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return genString(30)
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}
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panic("unreachable")
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}
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func genString(stddev float64) string {
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n := int(math.Abs(rand.NormFloat64()*stddev + stddev/2))
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c := make([]rune, n)
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for i := range c {
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f := math.Abs(rand.NormFloat64()*64 + 32)
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if f > 0x10ffff {
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f = 0x10ffff
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}
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c[i] = rune(f)
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}
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return string(c)
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}
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func genArray(n int) []interface{} {
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f := int(math.Abs(rand.NormFloat64()) * math.Min(10, float64(n/2)))
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if f > n {
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f = n
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}
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if n > 0 && f == 0 {
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f = 1
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}
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x := make([]interface{}, f)
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for i := range x {
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x[i] = genValue(((i+1)*n)/f - (i*n)/f)
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}
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return x
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}
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func genMap(n int) map[string]interface{} {
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f := int(math.Abs(rand.NormFloat64()) * math.Min(10, float64(n/2)))
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if f > n {
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f = n
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}
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if n > 0 && f == 0 {
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f = 1
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}
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x := make(map[string]interface{})
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for i := 0; i < f; i++ {
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x[genString(10)] = genValue(((i+1)*n)/f - (i*n)/f)
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}
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return x
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}
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