more iterating on macd, need to get a better handle on how to test.

ema_series_test.go

@@ -0,0 +1,35 @@
+package chart
+
+import (
+	"math"
+	"testing"
+
+	"github.com/blendlabs/go-assert"
+)
+
+func TestEMASeries(t *testing.T) {
+	assert := assert.New(t)
+
+	mockSeries := mockValueProvider{
+		Seq(1.0, 10.0),
+		Seq(10, 1.0),
+	}
+	assert.Equal(10, mockSeries.Len())
+
+	mas := &EMASeries{
+		InnerSeries: mockSeries,
+	}
+
+	var yvalues []float64
+	for x := 0; x < mas.Len(); x++ {
+		_, y := mas.GetValue(x)
+		yvalues = append(yvalues, y)
+	}
+
+	assert.Equal(10.0, yvalues[0])
+	assert.True(math.Abs(yvalues[9]-3.77) < 0.01)
+
+	lvx, lvy := mas.GetLastValue()
+	assert.Equal(10.0, lvx)
+	assert.True(math.Abs(lvy-3.77) < 0.01)
+}