introduces the Range interface (instead of a concrete type).

concat_series_test.go

@@ -0,0 +1,41 @@
+package chart
+
+import (
+	"testing"
+
+	assert "github.com/blendlabs/go-assert"
+)
+
+func TestConcatSeries(t *testing.T) {
+	assert := assert.New(t)
+
+	s1 := ContinuousSeries{
+		XValues: Seq(1.0, 10.0),
+		YValues: Seq(1.0, 10.0),
+	}
+
+	s2 := ContinuousSeries{
+		XValues: Seq(11, 20.0),
+		YValues: Seq(10.0, 1.0),
+	}
+
+	s3 := ContinuousSeries{
+		XValues: Seq(21, 30.0),
+		YValues: Seq(1.0, 10.0),
+	}
+
+	cs := ConcatSeries([]Series{s1, s2, s3})
+	assert.Equal(30, cs.Len())
+
+	x0, y0 := cs.GetValue(0)
+	assert.Equal(1.0, x0)
+	assert.Equal(1.0, y0)
+
+	xm, ym := cs.GetValue(19)
+	assert.Equal(20.0, xm)
+	assert.Equal(1.0, ym)
+
+	xn, yn := cs.GetValue(29)
+	assert.Equal(30.0, xn)
+	assert.Equal(10.0, yn)
+}