go-chart/legend_test.go

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package chart
import (
"bytes"
"testing"
"github.com/blendlabs/go-assert"
)
func TestLegend(t *testing.T) {
assert := assert.New(t)
graph := Chart{
Series: []Series{
ContinuousSeries{
Name: "A test series",
XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
},
},
}
//note we have to do this as a separate step because we need a reference to graph
graph.Elements = []Renderable{
Legend(&graph),
}
buf := bytes.NewBuffer([]byte{})
err := graph.Render(PNG, buf)
assert.Nil(err)
assert.NotZero(buf.Len())
}