diff --git a/legend_test.go b/legend_test.go
new file mode 100644
index 0000000..e10b538
--- /dev/null
+++ b/legend_test.go
@@ -0,0 +1,107 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+ "fmt"
+ "testing"
+
+ "github.com/stretchr/testify/assert"
+)
+
+func TestNewLegend(t *testing.T) {
+ assert := assert.New(t)
+
+ tests := []struct {
+ render func(*Painter) ([]byte, error)
+ result string
+ }{
+ {
+ render: func(p *Painter) ([]byte, error) {
+ _, err := NewLegendPainter(p, LegendOption{
+ Data: []string{
+ "One",
+ "Two",
+ "Three",
+ },
+ }).Render()
+ if err != nil {
+ return nil, err
+ }
+ return p.Bytes()
+ },
+ result: "",
+ },
+ {
+ render: func(p *Painter) ([]byte, error) {
+ _, err := NewLegendPainter(p, LegendOption{
+ Data: []string{
+ "One",
+ "Two",
+ "Three",
+ },
+ Left: PositionLeft,
+ }).Render()
+ if err != nil {
+ return nil, err
+ }
+ return p.Bytes()
+ },
+ result: "",
+ },
+ {
+ render: func(p *Painter) ([]byte, error) {
+ _, err := NewLegendPainter(p, LegendOption{
+ Data: []string{
+ "One",
+ "Two",
+ "Three",
+ },
+ Orient: OrientVertical,
+ Icon: IconRect,
+ Left: "10%",
+ }).Render()
+ if err != nil {
+ return nil, err
+ }
+ return p.Bytes()
+ },
+ result: "",
+ },
+ }
+ for index, tt := range tests {
+ if index != 0 {
+ continue
+ }
+ p, err := NewPainter(PainterOptions{
+ Type: ChartOutputSVG,
+ Width: 600,
+ Height: 400,
+ }, PainterThemeOption(defaultTheme))
+ assert.Nil(err)
+ data, err := tt.render(p)
+ assert.Nil(err)
+ fmt.Println(string(data))
+ assert.Equal(tt.result, string(data))
+ }
+}