chore: simplify tests with logtest (#3184)

core/logx/logtest/logtest.go

@@ -0,0 +1,78 @@
+package logtest
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"testing"
+
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+type Buffer struct {
+	buf *bytes.Buffer
+	t   *testing.T
+}
+
+func Discard(t *testing.T) {
+	prev := logx.Reset()
+	logx.SetWriter(logx.NewWriter(io.Discard))
+
+	t.Cleanup(func() {
+		logx.SetWriter(prev)
+	})
+}
+
+func NewCollector(t *testing.T) *Buffer {
+	var buf bytes.Buffer
+	writer := logx.NewWriter(&buf)
+	prev := logx.Reset()
+	logx.SetWriter(writer)
+
+	t.Cleanup(func() {
+		logx.SetWriter(prev)
+	})
+
+	return &Buffer{
+		buf: &buf,
+		t:   t,
+	}
+}
+
+func (b *Buffer) Bytes() []byte {
+	return b.buf.Bytes()
+}
+
+func (b *Buffer) Content() string {
+	var m map[string]interface{}
+	if err := json.Unmarshal(b.buf.Bytes(), &m); err != nil {
+		b.t.Error(err)
+		return ""
+	}
+
+	content, ok := m["content"]
+	if !ok {
+		return ""
+	}
+
+	switch val := content.(type) {
+	case string:
+		return val
+	default:
+		bs, err := json.Marshal(content)
+		if err != nil {
+			b.t.Error(err)
+			return ""
+		}
+
+		return string(bs)
+	}
+}
+
+func (b *Buffer) Reset() {
+	b.buf.Reset()
+}
+
+func (b *Buffer) String() string {
+	return b.buf.String()
+}

core/logx/logtest/logtest_test.go

@@ -0,0 +1,22 @@
+package logtest
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+func TestCollector(t *testing.T) {
+	const input = "hello"
+	c := NewCollector(t)
+	logx.Info(input)
+	assert.Equal(t, input, c.Content())
+	assert.Contains(t, c.String(), input)
+}
+
+func TestDiscard(t *testing.T) {
+	const input = "hello"
+	Discard(t)
+	logx.Info(input)
+}