more tests, revise existing tests

trees/avltree/avltree.go

@@ -2,13 +2,13 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Package avl implements an AVL balanced binary tree.
+// Package avltree implements an AVL balanced binary tree.
 //
 // Structure is not thread safe.
-//
-package avl
+package avltree
 
 import (
+	"fmt"
 	"io/ioutil"
 	"log"
 
@@ -20,7 +20,7 @@ func assertTreeImplementation() {
 	var _ trees.Tree = new(Tree)
 }
 
-var dbgLog = log.New(ioutil.Discard, "avl: ", log.LstdFlags)
+var dbgLog = log.New(ioutil.Discard, "avltree: ", log.LstdFlags)
 
 // Tree holds elements of the AVL tree.
 type Tree struct {
@@ -29,8 +29,7 @@ type Tree struct {
 	Comparator utils.Comparator
 }
 
-// A Node holds an Ordered element of the AVL tree in
-// the Val field.
+// Node is a single element within the tree
 type Node struct {
 	Key   interface{}
 	Value interface{}
@@ -70,20 +69,18 @@ func (t *Tree) Clear() {
 	t.size = 0
 }
 
-// Get looks up val and returns the matching element if
-// it is found.
-//
-// Val's Less implementation must be able to handle
-// comparisons to elements stored in this tree.
+// Get searches the node in the tree by key and returns its value or nil if key is not found in tree.
+// Second return parameter is true if key was found, otherwise false.
+// Key should adhere to the comparator's type assertion, otherwise method panics.
 func (t *Tree) Get(key interface{}) (value interface{}, found bool) {
 	n := t.Root
 	for n != nil {
 		cmp := t.Comparator(key, n.Key)
 		switch {
-		case cmp < 0:
-			n = n.c[0]
 		case cmp == 0:
 			return n.Value, true
+		case cmp < 0:
+			n = n.c[0]
 		case cmp > 0:
 			n = n.c[1]
 		}
@@ -205,7 +202,7 @@ func (t *Tree) Remove(key interface{}) {
 				*qp = q.c[0]
 				return true
 			}
-			fix := removemin(&q.c[1], &q.Key, &q.Value)
+			fix := removeMin(&q.c[1], &q.Key, &q.Value)
 			if fix {
 				return removeFix(-1, qp)
 			}
@@ -228,7 +225,7 @@ func (t *Tree) Remove(key interface{}) {
 	remove(&t.Root)
 }
 
-func removemin(qp **Node, minKey *interface{}, minVal *interface{}) bool {
+func removeMin(qp **Node, minKey *interface{}, minVal *interface{}) bool {
 	q := *qp
 	if q.c[0] == nil {
 		*minKey = q.Key
@@ -239,7 +236,7 @@ func removemin(qp **Node, minKey *interface{}, minVal *interface{}) bool {
 		*qp = q.c[1]
 		return true
 	}
-	fix := removemin(&q.c[0], minKey, minVal)
+	fix := removeMin(&q.c[0], minKey, minVal)
 	if fix {
 		return removeFix(1, qp)
 	}
@@ -423,3 +420,44 @@ func (n *Node) walk1(a int) *Node {
 	}
 	return p
 }
+
+// String returns a string representation of container
+func (t *Tree) String() string {
+	str := "AVLTree\n"
+	if !t.Empty() {
+		output(t.Root, "", true, &str)
+	}
+	return str
+}
+
+func (n *Node) String() string {
+	return fmt.Sprintf("%v", n.Key)
+}
+
+func output(node *Node, prefix string, isTail bool, str *string) {
+	if node.c[0] != nil {
+		newPrefix := prefix
+		if isTail {
+			newPrefix += "│   "
+		} else {
+			newPrefix += "    "
+		}
+		output(node.c[0], newPrefix, false, str)
+	}
+	*str += prefix
+	if isTail {
+		*str += "└── "
+	} else {
+		*str += "┌── "
+	}
+	*str += node.String() + "\n"
+	if node.c[1] != nil {
+		newPrefix := prefix
+		if isTail {
+			newPrefix += "    "
+		} else {
+			newPrefix += "│   "
+		}
+		output(node.c[1], newPrefix, true, str)
+	}
+}

trees/avltree/avltree_test.go

@@ -2,13 +2,24 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-package avl
+package avltree
 
 import (
 	"fmt"
+	"math/rand"
+	"os"
 	"testing"
+	"time"
 )
 
+var rng *rand.Rand
+
+func TestMain(m *testing.M) {
+	seed := time.Now().UTC().UnixNano()
+	rng = rand.New(rand.NewSource(seed))
+	os.Exit(m.Run())
+}
+
 func TestAVLPut(t *testing.T) {
 	tree := NewWithIntComparator()
 	tree.Put(5, "e")
@@ -557,7 +568,15 @@ func TestAVLIteratorLast(t *testing.T) {
 	}
 }
 
-func benchmarkGet(b *testing.B, tree *Tree, size int) {
+func newRandomIntTree(size, randMax int) *Tree {
+	tree := NewWithIntComparator()
+	for i := 0; i < size; i++ {
+		tree.Put(rng.Intn(randMax), nil)
+	}
+	return tree
+}
+
+func (tree *Tree) benchmarkGet(b *testing.B, size int) {
 	for i := 0; i < b.N; i++ {
 		for n := 0; n < size; n++ {
 			tree.Get(n)
@@ -565,19 +584,53 @@ func benchmarkGet(b *testing.B, tree *Tree, size int) {
 	}
 }
 
-func benchmarkPut(b *testing.B, tree *Tree, size int) {
+func (tree *Tree) benchmarkGetRandom(b *testing.B, size, randMax int) {
+	for i := 0; i < b.N; i++ {
+		for n := 0; n < size; n++ {
+			tree.Get(rng.Intn(randMax))
+		}
+	}
+}
+
+func (tree *Tree) benchmarkPut(b *testing.B, size int) {
+	for i := 0; i < b.N; i++ {
+		for n := 0; n < size; n++ {
+			tree.Put(n, nil)
+		}
+		tree.Empty()
+	}
+}
+
+func (tree *Tree) benchmarkPutRandom(b *testing.B, size, randMax int) {
 	for i := 0; i < b.N; i++ {
 		for n := 0; n < size; n++ {
-			tree.Put(n, struct{}{})
+			tree.Put(rng.Intn(randMax), nil)
 		}
+		tree.Empty()
 	}
 }
 
-func benchmarkRemove(b *testing.B, tree *Tree, size int) {
+func (tree *Tree) benchmarkPutAndRemove(b *testing.B, size int) {
 	for i := 0; i < b.N; i++ {
+		for n := 0; n < size; n++ {
+			tree.Put(n, nil)
+		}
 		for n := 0; n < size; n++ {
 			tree.Remove(n)
 		}
+		tree.Empty()
+	}
+}
+
+func (tree *Tree) benchmarkPutAndRemoveRandom(b *testing.B, size int, randMax int) {
+	for i := 0; i < b.N; i++ {
+		for n := 0; n < size; n++ {
+			tree.Put(rng.Intn(randMax), nil)
+		}
+		for n := 0; n < size; n++ {
+			tree.Remove(rng.Intn(randMax))
+		}
+		tree.Empty()
 	}
 }
 
@@ -586,10 +639,10 @@ func BenchmarkAVLGet100(b *testing.B) {
 	size := 100
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkGet(b, tree, size)
+	tree.benchmarkGet(b, size)
 }
 
 func BenchmarkAVLGet1000(b *testing.B) {
@@ -597,10 +650,10 @@ func BenchmarkAVLGet1000(b *testing.B) {
 	size := 1000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkGet(b, tree, size)
+	tree.benchmarkGet(b, size)
 }
 
 func BenchmarkAVLGet10000(b *testing.B) {
@@ -608,10 +661,10 @@ func BenchmarkAVLGet10000(b *testing.B) {
 	size := 10000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkGet(b, tree, size)
+	tree.benchmarkGet(b, size)
 }
 
 func BenchmarkAVLGet100000(b *testing.B) {
@@ -619,18 +672,53 @@ func BenchmarkAVLGet100000(b *testing.B) {
 	size := 100000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkGet(b, tree, size)
+	tree.benchmarkGet(b, size)
+}
+
+func BenchmarkAVLGetRandom100(b *testing.B) {
+	b.StopTimer()
+	size := 100
+	tree := newRandomIntTree(size, size*5)
+	b.StartTimer()
+	tree.benchmarkGetRandom(b, size, size*5)
+}
+
+func BenchmarkAVLGetRandom1000(b *testing.B) {
+	b.StopTimer()
+	size := 1000
+	tree := newRandomIntTree(size, size*5)
+	b.StartTimer()
+	tree.benchmarkGetRandom(b, size, size*5)
+}
+
+func BenchmarkAVLGetRandom10000(b *testing.B) {
+	b.StopTimer()
+	size := 10000
+	tree := newRandomIntTree(size, size*5)
+	b.StartTimer()
+	tree.benchmarkGetRandom(b, size, size*5)
+}
+
+func BenchmarkAVLGetRandom100000(b *testing.B) {
+	b.StopTimer()
+	size := 100000
+	tree := newRandomIntTree(size, size*5)
+	b.StartTimer()
+	tree.benchmarkGetRandom(b, size, size*5)
 }
 
 func BenchmarkAVLPut100(b *testing.B) {
 	b.StopTimer()
 	size := 100
 	tree := NewWithIntComparator()
+	for n := 0; n < size; n++ {
+		tree.Put(n, nil)
+	}
 	b.StartTimer()
-	benchmarkPut(b, tree, size)
+	tree.benchmarkPut(b, size)
 }
 
 func BenchmarkAVLPut1000(b *testing.B) {
@@ -638,10 +726,10 @@ func BenchmarkAVLPut1000(b *testing.B) {
 	size := 1000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkPut(b, tree, size)
+	tree.benchmarkPut(b, size)
 }
 
 func BenchmarkAVLPut10000(b *testing.B) {
@@ -649,10 +737,10 @@ func BenchmarkAVLPut10000(b *testing.B) {
 	size := 10000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkPut(b, tree, size)
+	tree.benchmarkPut(b, size)
 }
 
 func BenchmarkAVLPut100000(b *testing.B) {
@@ -660,52 +748,84 @@ func BenchmarkAVLPut100000(b *testing.B) {
 	size := 100000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkPut(b, tree, size)
+	tree.benchmarkPut(b, size)
+}
+
+func BenchmarkAVLPutRandom100(b *testing.B) {
+	b.StopTimer()
+	size := 100
+	tree := newRandomIntTree(size, size*5)
+	b.StartTimer()
+	tree.benchmarkPutRandom(b, size, size*5)
+}
+
+func BenchmarkAVLPutRandom1000(b *testing.B) {
+	b.StopTimer()
+	size := 1000
+	tree := newRandomIntTree(size, size*5)
+	b.StartTimer()
+	tree.benchmarkPutRandom(b, size, size*5)
+}
+
+func BenchmarkAVLPutRandom10000(b *testing.B) {
+	b.StopTimer()
+	size := 10000
+	tree := newRandomIntTree(size, size*5)
+	b.StartTimer()
+	tree.benchmarkPutRandom(b, size, size*5)
+}
+
+func BenchmarkAVLPutRandom100000(b *testing.B) {
+	b.StopTimer()
+	size := 100000
+	tree := newRandomIntTree(size, size*5)
+	b.StartTimer()
+	tree.benchmarkPutRandom(b, size, size*5)
 }
 
-func BenchmarkAVLRemove100(b *testing.B) {
+func BenchmarkAVLPutAndRemove100(b *testing.B) {
 	b.StopTimer()
 	size := 100
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkRemove(b, tree, size)
+	tree.benchmarkPutAndRemove(b, size)
 }
 
-func BenchmarkAVLRemove1000(b *testing.B) {
+func BenchmarkAVLPutAndRemove1000(b *testing.B) {
 	b.StopTimer()
 	size := 1000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkRemove(b, tree, size)
+	tree.benchmarkPutAndRemove(b, size)
 }
 
-func BenchmarkAVLRemove10000(b *testing.B) {
+func BenchmarkAVLPutAndRemove10000(b *testing.B) {
 	b.StopTimer()
 	size := 10000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkRemove(b, tree, size)
+	tree.benchmarkPutAndRemove(b, size)
 }
 
-func BenchmarkAVLRemove100000(b *testing.B) {
+func BenchmarkAVLPutAndRemove100000(b *testing.B) {
 	b.StopTimer()
 	size := 100000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkRemove(b, tree, size)
+	tree.benchmarkPutAndRemove(b, size)
 }

trees/avltree/iterator.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-package avl
+package avltree
 
 import "github.com/emirpasic/gods/containers"
 

trees/redblacktree/redblacktree_test.go

@@ -6,9 +6,20 @@ package redblacktree
 
 import (
 	"fmt"
+	"math/rand"
+	"os"
 	"testing"
+	"time"
 )
 
+var rng *rand.Rand
+
+func TestMain(m *testing.M) {
+	seed := time.Now().UTC().UnixNano()
+	rng = rand.New(rand.NewSource(seed))
+	os.Exit(m.Run())
+}
+
 func TestRedBlackTreePut(t *testing.T) {
 	tree := NewWithIntComparator()
 	tree.Put(5, "e")
@@ -19,7 +30,7 @@ func TestRedBlackTreePut(t *testing.T) {
 	tree.Put(1, "x")
 	tree.Put(2, "b")
 	tree.Put(1, "a") //overwrite
-
+	t.Log(tree)
 	if actualValue := tree.Size(); actualValue != 7 {
 		t.Errorf("Got %v expected %v", actualValue, 7)
 	}
@@ -557,7 +568,15 @@ func TestRedBlackTreeIteratorLast(t *testing.T) {
 	}
 }
 
-func benchmarkGet(b *testing.B, tree *Tree, size int) {
+func newRandomIntTree(size, randMax int) *Tree {
+	tree := NewWithIntComparator()
+	for i := 0; i < size; i++ {
+		tree.Put(rng.Intn(randMax), nil)
+	}
+	return tree
+}
+
+func (tree *Tree) benchmarkGet(b *testing.B, size int) {
 	for i := 0; i < b.N; i++ {
 		for n := 0; n < size; n++ {
 			tree.Get(n)
@@ -565,147 +584,248 @@ func benchmarkGet(b *testing.B, tree *Tree, size int) {
 	}
 }
 
-func benchmarkPut(b *testing.B, tree *Tree, size int) {
+func (tree *Tree) benchmarkGetRandom(b *testing.B, size, randMax int) {
+	for i := 0; i < b.N; i++ {
+		for n := 0; n < size; n++ {
+			tree.Get(rng.Intn(randMax))
+		}
+	}
+}
+
+func (tree *Tree) benchmarkPut(b *testing.B, size int) {
+	for i := 0; i < b.N; i++ {
+		for n := 0; n < size; n++ {
+			tree.Put(n, nil)
+		}
+		tree.Empty()
+	}
+}
+
+func (tree *Tree) benchmarkPutRandom(b *testing.B, size, randMax int) {
 	for i := 0; i < b.N; i++ {
 		for n := 0; n < size; n++ {
-			tree.Put(n, struct{}{})
+			tree.Put(rng.Intn(randMax), nil)
 		}
+		tree.Empty()
 	}
 }
 
-func benchmarkRemove(b *testing.B, tree *Tree, size int) {
+func (tree *Tree) benchmarkPutAndRemove(b *testing.B, size int) {
 	for i := 0; i < b.N; i++ {
+		for n := 0; n < size; n++ {
+			tree.Put(n, nil)
+		}
 		for n := 0; n < size; n++ {
 			tree.Remove(n)
 		}
+		tree.Empty()
+	}
+}
+
+func (tree *Tree) benchmarkPutAndRemoveRandom(b *testing.B, size int, randMax int) {
+	for i := 0; i < b.N; i++ {
+		for n := 0; n < size; n++ {
+			tree.Put(rng.Intn(randMax), nil)
+		}
+		for n := 0; n < size; n++ {
+			tree.Remove(rng.Intn(randMax))
+		}
+		tree.Empty()
 	}
 }
 
-func BenchmarkRedBlackTreeGet100(b *testing.B) {
+func BenchmarkAVLGet100(b *testing.B) {
 	b.StopTimer()
 	size := 100
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkGet(b, tree, size)
+	tree.benchmarkGet(b, size)
 }
 
-func BenchmarkRedBlackTreeGet1000(b *testing.B) {
+func BenchmarkAVLGet1000(b *testing.B) {
 	b.StopTimer()
 	size := 1000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkGet(b, tree, size)
+	tree.benchmarkGet(b, size)
 }
 
-func BenchmarkRedBlackTreeGet10000(b *testing.B) {
+func BenchmarkAVLGet10000(b *testing.B) {
 	b.StopTimer()
 	size := 10000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkGet(b, tree, size)
+	tree.benchmarkGet(b, size)
 }
 
-func BenchmarkRedBlackTreeGet100000(b *testing.B) {
+func BenchmarkAVLGet100000(b *testing.B) {
 	b.StopTimer()
 	size := 100000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkGet(b, tree, size)
+	tree.benchmarkGet(b, size)
+}
+
+func BenchmarkAVLGetRandom100(b *testing.B) {
+	b.StopTimer()
+	size := 100
+	tree := newRandomIntTree(size, size*5)
+	b.StartTimer()
+	tree.benchmarkGetRandom(b, size, size*5)
+}
+
+func BenchmarkAVLGetRandom1000(b *testing.B) {
+	b.StopTimer()
+	size := 1000
+	tree := newRandomIntTree(size, size*5)
+	b.StartTimer()
+	tree.benchmarkGetRandom(b, size, size*5)
+}
+
+func BenchmarkAVLGetRandom10000(b *testing.B) {
+	b.StopTimer()
+	size := 10000
+	tree := newRandomIntTree(size, size*5)
+	b.StartTimer()
+	tree.benchmarkGetRandom(b, size, size*5)
 }
 
-func BenchmarkRedBlackTreePut100(b *testing.B) {
+func BenchmarkAVLGetRandom100000(b *testing.B) {
+	b.StopTimer()
+	size := 100000
+	tree := newRandomIntTree(size, size*5)
+	b.StartTimer()
+	tree.benchmarkGetRandom(b, size, size*5)
+}
+
+func BenchmarkAVLPut100(b *testing.B) {
 	b.StopTimer()
 	size := 100
 	tree := NewWithIntComparator()
+	for n := 0; n < size; n++ {
+		tree.Put(n, nil)
+	}
 	b.StartTimer()
-	benchmarkPut(b, tree, size)
+	tree.benchmarkPut(b, size)
 }
 
-func BenchmarkRedBlackTreePut1000(b *testing.B) {
+func BenchmarkAVLPut1000(b *testing.B) {
 	b.StopTimer()
 	size := 1000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkPut(b, tree, size)
+	tree.benchmarkPut(b, size)
 }
 
-func BenchmarkRedBlackTreePut10000(b *testing.B) {
+func BenchmarkAVLPut10000(b *testing.B) {
 	b.StopTimer()
 	size := 10000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkPut(b, tree, size)
+	tree.benchmarkPut(b, size)
 }
 
-func BenchmarkRedBlackTreePut100000(b *testing.B) {
+func BenchmarkAVLPut100000(b *testing.B) {
 	b.StopTimer()
 	size := 100000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkPut(b, tree, size)
+	tree.benchmarkPut(b, size)
+}
+
+func BenchmarkAVLPutRandom100(b *testing.B) {
+	b.StopTimer()
+	size := 100
+	tree := newRandomIntTree(size, size*5)
+	b.StartTimer()
+	tree.benchmarkPutRandom(b, size, size*5)
+}
+
+func BenchmarkAVLPutRandom1000(b *testing.B) {
+	b.StopTimer()
+	size := 1000
+	tree := newRandomIntTree(size, size*5)
+	b.StartTimer()
+	tree.benchmarkPutRandom(b, size, size*5)
+}
+
+func BenchmarkAVLPutRandom10000(b *testing.B) {
+	b.StopTimer()
+	size := 10000
+	tree := newRandomIntTree(size, size*5)
+	b.StartTimer()
+	tree.benchmarkPutRandom(b, size, size*5)
+}
+
+func BenchmarkAVLPutRandom100000(b *testing.B) {
+	b.StopTimer()
+	size := 100000
+	tree := newRandomIntTree(size, size*5)
+	b.StartTimer()
+	tree.benchmarkPutRandom(b, size, size*5)
 }
 
-func BenchmarkRedBlackTreeRemove100(b *testing.B) {
+func BenchmarkAVLPutAndRemove100(b *testing.B) {
 	b.StopTimer()
 	size := 100
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkRemove(b, tree, size)
+	tree.benchmarkPutAndRemove(b, size)
 }
 
-func BenchmarkRedBlackTreeRemove1000(b *testing.B) {
+func BenchmarkAVLPutAndRemove1000(b *testing.B) {
 	b.StopTimer()
 	size := 1000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkRemove(b, tree, size)
+	tree.benchmarkPutAndRemove(b, size)
 }
 
-func BenchmarkRedBlackTreeRemove10000(b *testing.B) {
+func BenchmarkAVLPutAndRemove10000(b *testing.B) {
 	b.StopTimer()
 	size := 10000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkRemove(b, tree, size)
+	tree.benchmarkPutAndRemove(b, size)
 }
 
-func BenchmarkRedBlackTreeRemove100000(b *testing.B) {
+func BenchmarkAVLPutAndRemove100000(b *testing.B) {
 	b.StopTimer()
 	size := 100000
 	tree := NewWithIntComparator()
 	for n := 0; n < size; n++ {
-		tree.Put(n, struct{}{})
+		tree.Put(n, nil)
 	}
 	b.StartTimer()
-	benchmarkRemove(b, tree, size)
+	tree.benchmarkPutAndRemove(b, size)
 }