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

sma_series_test.go

@@ -0,0 +1,111 @@
+package chart
+
+import (
+	"testing"
+
+	"github.com/blendlabs/go-assert"
+)
+
+type mockValueProvider struct {
+	X []float64
+	Y []float64
+}
+
+func (m mockValueProvider) Len() int {
+	return MinInt(len(m.X), len(m.Y))
+}
+
+func (m mockValueProvider) GetValue(index int) (x, y float64) {
+	if index < 0 {
+		panic("negative index at GetValue()")
+	}
+	if index > MinInt(len(m.X), len(m.Y)) {
+		panic("index is outside the length of m.X or m.Y")
+	}
+	x = m.X[index]
+	y = m.Y[index]
+	return
+}
+
+func TestSMASeriesGetValue(t *testing.T) {
+	assert := assert.New(t)
+
+	mockSeries := mockValueProvider{
+		Seq(1.0, 10.0),
+		Seq(10, 1.0),
+	}
+	assert.Equal(10, mockSeries.Len())
+
+	mas := &SMASeries{
+		InnerSeries: mockSeries,
+		Period:      10,
+	}
+
+	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.Equal(9.5, yvalues[1])
+	assert.Equal(9.0, yvalues[2])
+	assert.Equal(8.5, yvalues[3])
+	assert.Equal(8.0, yvalues[4])
+	assert.Equal(7.5, yvalues[5])
+	assert.Equal(7.0, yvalues[6])
+	assert.Equal(6.5, yvalues[7])
+	assert.Equal(6.0, yvalues[8])
+}
+
+func TestSMASeriesGetLastValueWindowOverlap(t *testing.T) {
+	assert := assert.New(t)
+
+	mockSeries := mockValueProvider{
+		Seq(1.0, 10.0),
+		Seq(10, 1.0),
+	}
+	assert.Equal(10, mockSeries.Len())
+
+	mas := &SMASeries{
+		InnerSeries: mockSeries,
+		Period:      15,
+	}
+
+	var yvalues []float64
+	for x := 0; x < mas.Len(); x++ {
+		_, y := mas.GetValue(x)
+		yvalues = append(yvalues, y)
+	}
+
+	lx, ly := mas.GetLastValue()
+	assert.Equal(10.0, lx)
+	assert.Equal(5.5, ly)
+	assert.Equal(yvalues[len(yvalues)-1], ly)
+}
+
+func TestSMASeriesGetLastValue(t *testing.T) {
+	assert := assert.New(t)
+
+	mockSeries := mockValueProvider{
+		Seq(1.0, 100.0),
+		Seq(100, 1.0),
+	}
+	assert.Equal(100, mockSeries.Len())
+
+	mas := &SMASeries{
+		InnerSeries: mockSeries,
+		Period:      10,
+	}
+
+	var yvalues []float64
+	for x := 0; x < mas.Len(); x++ {
+		_, y := mas.GetValue(x)
+		yvalues = append(yvalues, y)
+	}
+
+	lx, ly := mas.GetLastValue()
+	assert.Equal(100.0, lx)
+	assert.Equal(6, ly)
+	assert.Equal(yvalues[len(yvalues)-1], ly)
+}