removing point, adding tests.

grid_line_test.go

@@ -0,0 +1,27 @@
+package chart
+
+import (
+	"testing"
+
+	"github.com/blendlabs/go-assert"
+)
+
+func TestGenerateGridLines(t *testing.T) {
+	assert := assert.New(t)
+
+	ticks := []Tick{
+		Tick{Value: 1.0, Label: "1.0"},
+		Tick{Value: 2.0, Label: "2.0"},
+		Tick{Value: 3.0, Label: "3.0"},
+		Tick{Value: 4.0, Label: "4.0"},
+	}
+
+	gl := GenerateGridLines(ticks, true)
+	assert.Len(gl, 4)
+	assert.Equal(1.0, gl[0].Value)
+	assert.Equal(2.0, gl[1].Value)
+	assert.Equal(3.0, gl[2].Value)
+	assert.Equal(4.0, gl[3].Value)
+
+	assert.True(gl[0].IsVertical)
+}