diff --git a/datastructures.go b/datastructures.go
index f863519..d6fcb8b 100644
--- a/datastructures.go
+++ b/datastructures.go
@@ -1,8 +1,14 @@
 package main
 
+import (
+	"fmt"
+	"io"
+)
+
 type TreeNode interface {
 	Left() TreeNode
 	Right() TreeNode
+	Print(io.Writer)
 }
 
 type BTreeNode struct {
@@ -31,6 +37,16 @@ func (sbt *StringyBTreeNode) Right() TreeNode {
 	return sbt.right
 }
 
+func (sbt *StringyBTreeNode) Print(w io.Writer) {
+	fmt.Printf("%+v\n", sbt)
+	if sbt.left != nil {
+		sbt.left.Print(w)
+	}
+	if sbt.right != nil {
+		sbt.right.Print(w)
+	}
+}
+
 func (sbt *StringyBTreeNode) Insert(k string, v interface{}) *StringyBTreeNode {
 	if sbt.k == k {
 		sbt.v = v // set new value
diff --git a/datastructures_test.go b/datastructures_test.go
index 7d25518..020ec40 100644
--- a/datastructures_test.go
+++ b/datastructures_test.go
@@ -22,4 +22,17 @@ func TestBuildingTree(t *testing.T) {
 	if tree.Get("bar") != 5 {
 		t.Fail()
 	}
+	if tree.Get("zot") != nil {
+		t.Fail()
+	}
+}
+
+var r TreeNode
+
+func BenchmarkInserts(b *testing.B) {
+	var result TreeNode
+	for n := 0; n < b.N; n++ {
+		NewStringyBTree("foo", 1).Insert("bar", 2).Insert("baz", 3).Insert("quuz", 4)
+	}
+	r = result
 }