sanity check tests.

_examples/scatter/main.go

@@ -48,7 +48,33 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 }
 
+func unit(res http.ResponseWriter, req *http.Request) {
+	graph := chart.Chart{
+		Height: 50,
+		Width:  50,
+		Canvas: chart.Style{
+			Padding: chart.Box{IsSet: true},
+		},
+		Background: chart.Style{
+			Padding: chart.Box{IsSet: true},
+		},
+		Series: []chart.Series{
+			chart.ContinuousSeries{
+				XValues: chart.Sequence.Float64(0, 4, 1),
+				YValues: chart.Sequence.Float64(0, 4, 1),
+			},
+		},
+	}
+
+	res.Header().Set("Content-Type", "image/png")
+	err := graph.Render(chart.PNG, res)
+	if err != nil {
+		log.Println(err.Error())
+	}
+}
+
 func main() {
 	http.HandleFunc("/", drawChart)
+	http.HandleFunc("/unit", unit)
 	log.Fatal(http.ListenAndServe(":8080", nil))
 }