indicator/v2: add SMA example

pkg/indicator/v2/sma_test.go

@@ -0,0 +1,22 @@
+package indicatorv2
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/c9s/bbgo/pkg/types"
+)
+
+func TestSMA(t *testing.T) {
+	source := types.NewFloat64Series()
+	sma := SMA(source, 9)
+
+	data := []float64{1, 2, 3, 4, 5, 6, 7, 8, 9}
+	for _, d := range data {
+		source.PushAndEmit(d)
+	}
+
+	assert.InDelta(t, 5, sma.Last(0), 0.001)
+	assert.InDelta(t, 4.5, sma.Last(1), 0.001)
+}