go-json/encode_test.go

package json_test

import (
	"testing"

	"github.com/goccy/go-json"
)

func assertErr(t *testing.T, err error) {
	t.Helper()
	if err != nil {
		t.Fatalf("%+v", err)
	}
}

func assertEq(t *testing.T, msg string, exp interface{}, act interface{}) {
	t.Helper()
	if exp != act {
		t.Fatalf("failed to encode %s. exp=[%v] but act=[%v]", msg, exp, act)
	}
}

func Test_Encoder(t *testing.T) {
	t.Run("int", func(t *testing.T) {
		bytes, err := json.Marshal(-10)
		assertErr(t, err)
		assertEq(t, "int", `-10`, string(bytes))
	})
	t.Run("int8", func(t *testing.T) {
		bytes, err := json.Marshal(int8(-11))
		assertErr(t, err)
		assertEq(t, "int8", `-11`, string(bytes))
	})
	t.Run("int16", func(t *testing.T) {
		bytes, err := json.Marshal(int16(-12))
		assertErr(t, err)
		assertEq(t, "int16", `-12`, string(bytes))
	})
	t.Run("int32", func(t *testing.T) {
		bytes, err := json.Marshal(int32(-13))
		assertErr(t, err)
		assertEq(t, "int32", `-13`, string(bytes))
	})
	t.Run("int64", func(t *testing.T) {
		bytes, err := json.Marshal(int64(-14))
		assertErr(t, err)
		assertEq(t, "int64", `-14`, string(bytes))
	})
	t.Run("uint", func(t *testing.T) {
		bytes, err := json.Marshal(uint(10))
		assertErr(t, err)
		assertEq(t, "uint", `10`, string(bytes))
	})
	t.Run("uint8", func(t *testing.T) {
		bytes, err := json.Marshal(uint8(11))
		assertErr(t, err)
		assertEq(t, "uint8", `11`, string(bytes))
	})
	t.Run("uint16", func(t *testing.T) {
		bytes, err := json.Marshal(uint16(12))
		assertErr(t, err)
		assertEq(t, "uint16", `12`, string(bytes))
	})
	t.Run("uint32", func(t *testing.T) {
		bytes, err := json.Marshal(uint32(13))
		assertErr(t, err)
		assertEq(t, "uint32", `13`, string(bytes))
	})
	t.Run("uint64", func(t *testing.T) {
		bytes, err := json.Marshal(uint64(14))
		assertErr(t, err)
		assertEq(t, "uint64", `14`, string(bytes))
	})
	t.Run("float32", func(t *testing.T) {
		bytes, err := json.Marshal(float32(3.14))
		assertErr(t, err)
		assertEq(t, "float32", `3.14`, string(bytes))
	})
	t.Run("float64", func(t *testing.T) {
		bytes, err := json.Marshal(float64(3.14))
		assertErr(t, err)
		assertEq(t, "float64", `3.14`, string(bytes))
	})
	t.Run("bool", func(t *testing.T) {
		bytes, err := json.Marshal(true)
		assertErr(t, err)
		assertEq(t, "bool", `true`, string(bytes))
	})
	t.Run("string", func(t *testing.T) {
		bytes, err := json.Marshal("hello world")
		assertErr(t, err)
		assertEq(t, "string", `"hello world"`, string(bytes))
	})
	t.Run("struct", func(t *testing.T) {
		bytes, err := json.Marshal(struct {
			A int    `json:"a"`
			B uint   `json:"b"`
			C string `json:"c"`
			D int    `json:"-"`  // ignore field
			a int    `json:"aa"` // private field
		}{
			A: -1,
			B: 1,
			C: "hello world",
		})
		assertErr(t, err)
		assertEq(t, "struct", `{"a":-1,"b":1,"c":"hello world"}`, string(bytes))
	})
	t.Run("slice", func(t *testing.T) {
		bytes, err := json.Marshal([]int{1, 2, 3, 4})
		assertErr(t, err)
		assertEq(t, "slice", `[1,2,3,4]`, string(bytes))
	})
	t.Run("array", func(t *testing.T) {
		bytes, err := json.Marshal([4]int{1, 2, 3, 4})
		assertErr(t, err)
		assertEq(t, "array", `[1,2,3,4]`, string(bytes))
	})
	t.Run("map", func(t *testing.T) {
		bytes, err := json.Marshal(map[string]int{
			"a": 1,
			"b": 2,
			"c": 3,
			"d": 4,
		})
		assertErr(t, err)
		assertEq(t, "map", len(`{"a":1,"b":2,"c":3,"d":4}`), len(string(bytes)))
	})
}