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node_test.go
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node_test.go
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package art
import (
"testing"
//"fmt"
"github.com/stretchr/testify/assert"
)
func TestNodeKind(t *testing.T) {
n4 := factory.newNode4()
assert.NotNil(t, n4)
assert.Equal(t, Node4, n4.kind)
n16 := factory.newNode16()
assert.NotNil(t, n16)
assert.Equal(t, Node16, n16.kind)
n48 := factory.newNode48()
assert.NotNil(t, n48)
assert.Equal(t, Node48, n48.kind)
n256 := factory.newNode256()
assert.NotNil(t, n256)
assert.Equal(t, Node256, n256.kind)
leaf := factory.newLeaf([]byte("key"), "value")
assert.NotNil(t, leaf)
assert.Equal(t, Leaf, leaf.kind)
assert.Equal(t, leaf.Key(), Key([]byte("key")))
assert.Equal(t, leaf.Value().(string), "value")
assert.Equal(t, "Node4", n4.kind.String())
assert.Equal(t, "Node16", n16.kind.String())
assert.Equal(t, "Node48", n48.kind.String())
assert.Equal(t, "Node256", n256.kind.String())
assert.Equal(t, "Leaf", leaf.kind.String())
unknowNode := &artNode{kind: Kind(0xFF)}
assert.Nil(t, unknowNode.maximum())
assert.Nil(t, unknowNode.minimum())
}
func TestLeaf(t *testing.T) {
leaf := factory.newLeaf([]byte("key"), "value")
assert.NotNil(t, leaf)
assert.Equal(t, Leaf, leaf.kind)
assert.False(t, leaf.leaf().match([]byte("unknown-key")))
// we cannot shrink/grow leaf node
assert.Nil(t, leaf.shrink())
assert.Nil(t, leaf.grow())
}
func TestLeafMatch(t *testing.T) {
leaf := factory.newLeaf([]byte("key"), "value")
assert.False(t, leaf.leaf().match([]byte("unknown-key")))
assert.False(t, leaf.leaf().match(nil))
assert.True(t, leaf.leaf().match([]byte("key")))
}
func TestLeafPrefixMatch(t *testing.T) {
leaf := factory.newLeaf([]byte("key"), "value")
assert.False(t, leaf.leaf().prefixMatch([]byte("unknown-key")))
assert.False(t, leaf.leaf().prefixMatch(nil))
assert.True(t, leaf.leaf().prefixMatch([]byte("ke")))
}
func TestNodeSetPrefix(t *testing.T) {
n4 := factory.newNode4()
assert.NotNil(t, n4)
nn := n4.node()
key := []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
n4.setPrefix(key, 2)
assert.Equal(t, uint32(2), nn.prefixLen)
assert.Equal(t, byte(1), nn.prefix[0])
assert.Equal(t, byte(2), nn.prefix[1])
n4.setPrefix(key, MaxPrefixLen)
assert.Equal(t, uint32(MaxPrefixLen), nn.prefixLen)
assert.Equal(t, byte(1), nn.prefix[0])
assert.Equal(t, byte(2), nn.prefix[1])
assert.Equal(t, byte(3), nn.prefix[2])
assert.Equal(t, byte(4), nn.prefix[3])
}
func TestNodeMatchWithKey(t *testing.T) {
key := []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
n16 := factory.newNode16()
n16.setPrefix([]byte{1, 2, 3, 4, 5, 66, 77, 88, 99}, 5)
idx := n16.match(key, 0)
assert.Equal(t, uint32(5), idx)
idx = n16.match(key, 1)
assert.Equal(t, uint32(0), idx)
idx = n16.match(key, 100)
assert.Equal(t, uint32(0), idx)
}
func TestNodeCopyMeta(t *testing.T) {
newNode := factory.newNode4()
node4 := newNode.node4()
node4.numChildren = 2
node4.prefixLen = 2
node4.prefix[0] = byte(10)
node4.prefix[1] = byte(20)
assert.Equal(t, newNode, newNode.copyMeta(nil))
newNode2 := factory.newNode4()
node4 = newNode2.node4()
node4.numChildren = 4
node4.prefixLen = 3
node4.prefix[0] = byte(11)
node4.prefix[1] = byte(22)
node4.prefix[2] = byte(33)
assert.Equal(t, newNode, newNode.copyMeta(newNode2))
assert.Equal(t, uint32(3), newNode.node().prefixLen)
assert.Equal(t, uint16(4), newNode.node().numChildren)
assert.Equal(t, byte(11), newNode.node().prefix[0])
assert.Equal(t, byte(22), newNode.node().prefix[1])
assert.Equal(t, byte(33), newNode.node().prefix[2])
}
func TestLeafFindChild(t *testing.T) {
leaf := factory.newLeaf(Key("key"), "value")
res := leaf.findChild('k', true)
assert.Equal(t, &nodeNotFound, res)
}
func TestNodeAddChild(t *testing.T) {
nodes := []*artNode{
factory.newNode4(),
factory.newNode16(),
factory.newNode48(),
factory.newNode256(),
}
for _, n := range nodes {
var maxChildren int = -1
switch n.kind {
case Node4:
maxChildren = node4Max
case Node16:
maxChildren = node16Max
case Node48:
maxChildren = node48Max
case Node256:
maxChildren = node256Max
}
for i := 0; i < maxChildren; i++ {
leaf := factory.newLeaf([]byte{byte(i)}, i)
n.addChild(byte(i), true, leaf)
}
for i := 0; i < maxChildren; i++ {
leaf := n.findChild(byte(i), true)
assert.NotNil(t, *leaf)
assert.Equal(t, i, (*leaf).leaf().value.(int))
}
}
}
func TestNodeAddChildForLeaf(t *testing.T) {
leaf := factory.newLeaf([]byte("key"), "value")
assert.False(t, leaf.addChild('c', true, nil))
}
func TestNodeIndex(t *testing.T) {
nodes := []*artNode{
factory.newNode4(),
factory.newNode16(),
factory.newNode48(),
factory.newNode256(),
}
for _, n := range nodes {
var maxChildren int
switch n.kind {
case Node4:
maxChildren = node4Max
case Node16:
maxChildren = node16Max
case Node48:
maxChildren = node48Max
case Node256:
maxChildren = node256Max
}
for i := 0; i < maxChildren; i++ {
leaf := factory.newLeaf([]byte{byte(i)}, i)
n.addChild(byte(i), true, leaf)
}
for i := 0; i < maxChildren; i++ {
assert.Equal(t, i, n.index(byte(i)))
}
}
}
func TestNodesMinimumMaximum(t *testing.T) {
// TODO: Merge nodes and inserts
nodes := []*artNode{
factory.newNode4(),
factory.newNode16(),
factory.newNode48(),
factory.newNode256(),
}
inserts := []int{3, 15, 47, 255}
for i, node := range nodes {
for j := 1; j <= inserts[i]; j++ {
node.addChild(byte(j), true, factory.newLeaf([]byte{byte(j)}, byte(j)))
}
minLeaf := node.minimum()
assert.Equal(t, minLeaf.key, Key{1})
assert.Equal(t, minLeaf.value.(byte), minLeaf.value.(byte))
maxLeaf := node.maximum()
assert.Equal(t, maxLeaf.key, Key{byte(inserts[i])})
assert.Equal(t, maxLeaf.value.(byte), maxLeaf.value.(byte))
}
}
func TestNode4AddChildAndFindChild(t *testing.T) {
parent := factory.newNode4()
child := factory.newNode4()
parent.addChild(1, true, child)
assert.Equal(t, uint16(1), parent.node().numChildren)
assert.Equal(t, child, *parent.findChild(1, true))
}
func TestNode4AddChildTwicePreserveSorted(t *testing.T) {
parent := factory.newNode4()
child1 := factory.newNode4()
child2 := factory.newNode4()
parent.addChild(2, true, child1)
parent.addChild(1, true, child2)
assert.Equal(t, uint16(2), parent.node().numChildren)
assert.Equal(t, byte(1), parent.node4().keys[0])
assert.Equal(t, byte(2), parent.node4().keys[1])
}
func TestNode4AddChild4PreserveSorted(t *testing.T) {
parent := factory.newNode4()
for i := 4; i > 0; i-- {
parent.addChild(byte(i), true, factory.newNode4())
}
assert.Equal(t, uint16(4), parent.node().numChildren)
assert.Equal(t, []byte{
byte(1),
byte(2),
byte(3),
byte(4),
}, parent.node4().keys[:])
}
func TestNode16AddChild16PreserveSorted(t *testing.T) {
parent := factory.newNode16()
for i := 16; i > 0; i-- {
parent.addChild(byte(i), true, factory.newNode16())
}
assert.Equal(t, uint16(16), parent.node().numChildren)
for i := 0; i < 16; i++ {
assert.Equal(t, byte(i+1), parent.node16().keys[i])
}
}
func TestGrow(t *testing.T) {
nodes := []*artNode{factory.newNode4(), factory.newNode16(), factory.newNode48()}
expected := []Kind{Node16, Node48, Node256}
for i, node := range nodes {
newNode := node.grow()
assert.Equal(t, expected[i], newNode.kind)
}
}
func TestShrink(t *testing.T) {
nodes := []*artNode{
factory.newNode256(),
factory.newNode48(),
factory.newNode16(),
factory.newNode4(),
}
expected := []Kind{
Node48,
Node16,
Node4,
Leaf,
}
for i, node := range nodes {
var minChildren int
switch node.kind {
case Node4:
minChildren = node4Min
case Node16:
minChildren = node16Min
case Node48:
minChildren = node48Min
case Node256:
minChildren = node256Min
}
for j := 0; j < minChildren; j++ {
if node.kind != Node4 {
node.addChild(byte(i), true, factory.newNode4())
} else {
node.addChild(byte(i), true, factory.newLeaf(Key{byte(i)}, "value"))
}
}
newNode := node.shrink()
assert.Equal(t, expected[i], newNode.kind)
}
}