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unbounded_deque_test.go
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// Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package buffer
import (
"testing"
"github.com/stretchr/testify/require"
)
func TestUnboundedDeque_InitialCapGreaterThanMin(t *testing.T) {
require := require.New(t)
bIntf := NewUnboundedDeque[int](10)
require.IsType(&unboundedSliceDeque[int]{}, bIntf)
b := bIntf.(*unboundedSliceDeque[int])
require.Empty(b.List())
require.Zero(b.Len())
_, ok := b.Index(0)
require.False(ok)
b.PushLeft(1)
require.Equal(1, b.Len())
require.Equal([]int{1}, b.List())
got, ok := b.Index(0)
require.True(ok)
require.Equal(1, got)
_, ok = b.Index(1)
require.False(ok)
got, ok = b.PopLeft()
require.Zero(b.Len())
require.True(ok)
require.Equal(1, got)
_, ok = b.Index(0)
require.False(ok)
b.PushLeft(1)
require.Equal(1, b.Len())
require.Equal([]int{1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
got, ok = b.PopRight()
require.Zero(b.Len())
require.True(ok)
require.Equal(1, got)
require.Empty(b.List())
_, ok = b.Index(0)
require.False(ok)
b.PushRight(1)
require.Equal(1, b.Len())
require.Equal([]int{1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
got, ok = b.PopRight()
require.Zero(b.Len())
require.True(ok)
require.Equal(1, got)
require.Empty(b.List())
_, ok = b.Index(0)
require.False(ok)
b.PushRight(1)
require.Equal(1, b.Len())
require.Equal([]int{1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
got, ok = b.PopLeft()
require.Zero(b.Len())
require.True(ok)
require.Equal(1, got)
require.Empty(b.List())
_, ok = b.Index(0)
require.False(ok)
b.PushLeft(1)
require.Equal(1, b.Len())
require.Equal([]int{1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
b.PushLeft(2)
require.Equal(2, b.Len())
require.Equal([]int{2, 1}, b.List())
got, ok = b.PopLeft()
require.Equal(1, b.Len())
require.True(ok)
require.Equal(2, got)
require.Equal([]int{1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
got, ok = b.PopLeft()
require.Zero(b.Len())
require.True(ok)
require.Equal(1, got)
require.Empty(b.List())
_, ok = b.Index(0)
require.False(ok)
b.PushRight(1)
require.Equal(1, b.Len())
require.Equal([]int{1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
b.PushRight(2)
require.Equal(2, b.Len())
require.Equal([]int{1, 2}, b.List())
got, ok = b.PopRight()
require.Equal(1, b.Len())
require.True(ok)
require.Equal(2, got)
require.Equal([]int{1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
got, ok = b.PopRight()
require.Zero(b.Len())
require.True(ok)
require.Equal(1, got)
require.Empty(b.List())
_, ok = b.Index(0)
require.False(ok)
b.PushLeft(1)
require.Equal(1, b.Len())
require.Equal([]int{1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
b.PushLeft(2)
require.Equal(2, b.Len())
require.Equal([]int{2, 1}, b.List())
got, ok = b.PopRight()
require.Equal(1, b.Len())
require.True(ok)
require.Equal(1, got)
require.Equal([]int{2}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(2, got)
got, ok = b.PopLeft()
require.Zero(b.Len())
require.True(ok)
require.Equal(2, got)
require.Empty(b.List())
_, ok = b.Index(0)
require.False(ok)
b.PushRight(1)
require.Equal(1, b.Len())
require.Equal([]int{1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
b.PushLeft(2)
require.Equal(2, b.Len())
require.Equal([]int{2, 1}, b.List())
got, ok = b.PopRight()
require.Equal(1, b.Len())
require.True(ok)
require.Equal(1, got)
require.Equal([]int{2}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(2, got)
got, ok = b.PopLeft()
require.Zero(b.Len())
require.True(ok)
require.Equal(2, got)
require.Empty(b.List())
_, ok = b.Index(0)
require.False(ok)
b.PushLeft(1)
require.Equal(1, b.Len())
require.Equal([]int{1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
b.PushRight(2)
require.Equal(2, b.Len())
require.Equal([]int{1, 2}, b.List())
got, ok = b.PopLeft()
require.Equal(1, b.Len())
require.True(ok)
require.Equal(1, got)
require.Equal([]int{2}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(2, got)
got, ok = b.PopRight()
require.Zero(b.Len())
require.True(ok)
require.Equal(2, got)
require.Empty(b.List())
_, ok = b.Index(0)
require.False(ok)
}
// Cases we test:
// 1. [left] moves to the left (no wrap around).
// 2. [left] moves to the right (no wrap around).
// 3. [left] wrapping around to the left side.
// 4. [left] wrapping around to the right side.
// 5. Resize.
func TestUnboundedSliceDequePushLeftPopLeft(t *testing.T) {
require := require.New(t)
// Starts empty.
bIntf := NewUnboundedDeque[int](2)
require.IsType(&unboundedSliceDeque[int]{}, bIntf)
b := bIntf.(*unboundedSliceDeque[int])
require.Zero(bIntf.Len())
require.Len(b.data, 2)
require.Zero(b.left)
require.Equal(1, b.right)
require.Empty(b.List())
// slice is [EMPTY]
_, ok := b.PopLeft()
require.False(ok)
_, ok = b.PeekLeft()
require.False(ok)
_, ok = b.PeekRight()
require.False(ok)
b.PushLeft(1) // slice is [1,EMPTY]
require.Equal(1, b.Len())
require.Len(b.data, 2)
require.Equal(1, b.left)
require.Equal(1, b.right)
require.Equal([]int{1}, b.List())
got, ok := b.PeekLeft()
require.True(ok)
require.Equal(1, got)
got, ok = b.PeekRight()
require.True(ok)
require.Equal(1, got)
// This causes a resize
b.PushLeft(2) // slice is [2,1,EMPTY,EMPTY]
require.Equal(2, b.Len())
require.Len(b.data, 4)
require.Equal(3, b.left)
require.Equal(2, b.right)
require.Equal([]int{2, 1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(2, got)
got, ok = b.Index(1)
require.True(ok)
require.Equal(1, got)
got, ok = b.PeekLeft()
require.True(ok)
require.Equal(2, got)
got, ok = b.PeekRight()
require.True(ok)
require.Equal(1, got)
// Tests left moving left with no wrap around.
b.PushLeft(3) // slice is [2,1,EMPTY,3]
require.Equal(3, b.Len())
require.Len(b.data, 4)
require.Equal(2, b.left)
require.Equal(2, b.right)
require.Equal([]int{3, 2, 1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(3, got)
got, ok = b.Index(1)
require.True(ok)
require.Equal(2, got)
got, ok = b.Index(2)
require.True(ok)
require.Equal(1, got)
_, ok = b.Index(3)
require.False(ok)
got, ok = b.PeekLeft()
require.True(ok)
require.Equal(3, got)
got, ok = b.PeekRight()
require.True(ok)
require.Equal(1, got)
// Tests left moving right with no wrap around.
got, ok = b.PopLeft() // slice is [2,1,EMPTY,EMPTY]
require.True(ok)
require.Equal(3, got)
require.Equal(2, b.Len())
require.Len(b.data, 4)
require.Equal(3, b.left)
require.Equal(2, b.right)
require.Equal([]int{2, 1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(2, got)
got, ok = b.Index(1)
require.True(ok)
require.Equal(1, got)
got, ok = b.PeekLeft()
require.True(ok)
require.Equal(2, got)
got, ok = b.PeekRight()
require.True(ok)
require.Equal(1, got)
// Tests left wrapping around to the left side.
got, ok = b.PopLeft() // slice is [EMPTY,1,EMPTY,EMPTY]
require.True(ok)
require.Equal(2, got)
require.Equal(1, b.Len())
require.Len(b.data, 4)
require.Zero(b.left)
require.Equal(2, b.right)
require.Equal([]int{1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
got, ok = b.PeekLeft()
require.True(ok)
require.Equal(1, got)
got, ok = b.PeekRight()
require.True(ok)
require.Equal(1, got)
// Test left wrapping around to the right side.
b.PushLeft(2) // slice is [2,1,EMPTY,EMPTY]
require.Equal(2, b.Len())
require.Len(b.data, 4)
require.Equal(3, b.left)
require.Equal(2, b.right)
require.Equal([]int{2, 1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(2, got)
got, ok = b.Index(1)
require.True(ok)
require.Equal(1, got)
got, ok = b.PeekLeft()
require.True(ok)
require.Equal(2, got)
got, ok = b.PeekRight()
require.True(ok)
require.Equal(1, got)
got, ok = b.PopLeft() // slice is [EMPTY,1,EMPTY,EMPTY]
require.True(ok)
require.Equal(2, got)
require.Equal(1, b.Len())
require.Len(b.data, 4)
require.Zero(b.left)
require.Equal(2, b.right)
require.Equal([]int{1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
got, ok = b.PopLeft() // slice is [EMPTY,EMPTY,EMPTY,EMPTY]
require.True(ok)
require.Equal(1, got)
require.Zero(b.Len())
require.Len(b.data, 4)
require.Equal(1, b.left)
require.Equal(2, b.right)
require.Empty(b.List())
_, ok = b.Index(0)
require.False(ok)
_, ok = b.PopLeft()
require.False(ok)
_, ok = b.PeekLeft()
require.False(ok)
_, ok = b.PeekRight()
require.False(ok)
}
func TestUnboundedSliceDequePushRightPopRight(t *testing.T) {
require := require.New(t)
// Starts empty.
bIntf := NewUnboundedDeque[int](2)
require.IsType(&unboundedSliceDeque[int]{}, bIntf)
b := bIntf.(*unboundedSliceDeque[int])
require.Zero(bIntf.Len())
require.Len(b.data, 2)
require.Zero(b.left)
require.Equal(1, b.right)
require.Empty(b.List())
// slice is [EMPTY]
_, ok := b.PopRight()
require.False(ok)
_, ok = b.PeekLeft()
require.False(ok)
_, ok = b.PeekRight()
require.False(ok)
b.PushRight(1) // slice is [1,EMPTY]
require.Equal(1, b.Len())
require.Len(b.data, 2)
require.Zero(b.left)
require.Zero(b.right)
require.Equal([]int{1}, b.List())
got, ok := b.Index(0)
require.True(ok)
require.Equal(1, got)
got, ok = b.PeekLeft()
require.True(ok)
require.Equal(1, got)
got, ok = b.PeekRight()
require.True(ok)
require.Equal(1, got)
// This causes a resize
b.PushRight(2) // slice is [1,2,EMPTY,EMPTY]
require.Equal(2, b.Len())
require.Len(b.data, 4)
require.Equal(3, b.left)
require.Equal(2, b.right)
require.Equal([]int{1, 2}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
got, ok = b.Index(1)
require.True(ok)
require.Equal(2, got)
got, ok = b.PeekLeft()
require.True(ok)
require.Equal(1, got)
got, ok = b.PeekRight()
require.True(ok)
require.Equal(2, got)
// Tests right moving right with no wrap around
b.PushRight(3) // slice is [1,2,3,EMPTY]
require.Equal(3, b.Len())
require.Len(b.data, 4)
require.Equal(3, b.left)
require.Equal(3, b.right)
require.Equal([]int{1, 2, 3}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
got, ok = b.Index(1)
require.True(ok)
require.Equal(2, got)
got, ok = b.Index(2)
require.True(ok)
require.Equal(3, got)
got, ok = b.PeekLeft()
require.True(ok)
require.Equal(1, got)
got, ok = b.PeekRight()
require.True(ok)
require.Equal(3, got)
// Tests right moving left with no wrap around
got, ok = b.PopRight() // slice is [1,2,EMPTY,EMPTY]
require.True(ok)
require.Equal(3, got)
require.Equal(2, b.Len())
require.Len(b.data, 4)
require.Equal(3, b.left)
require.Equal(2, b.right)
require.Equal([]int{1, 2}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
got, ok = b.Index(1)
require.True(ok)
require.Equal(2, got)
_, ok = b.Index(2)
require.False(ok)
got, ok = b.PeekLeft()
require.True(ok)
require.Equal(1, got)
got, ok = b.PeekRight()
require.True(ok)
require.Equal(2, got)
got, ok = b.PopRight() // slice is [1,EMPTY,EMPTY,EMPTY]
require.True(ok)
require.Equal(2, got)
require.Equal(1, b.Len())
require.Len(b.data, 4)
require.Equal(3, b.left)
require.Equal(1, b.right)
require.Equal([]int{1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
_, ok = b.Index(1)
require.False(ok)
got, ok = b.PeekLeft()
require.True(ok)
require.Equal(1, got)
got, ok = b.PeekRight()
require.True(ok)
require.Equal(1, got)
got, ok = b.PopRight() // slice is [EMPTY,EMPTY,EMPTY,EMPTY]
require.True(ok)
require.Equal(1, got)
require.Zero(b.Len())
require.Len(b.data, 4)
require.Equal(3, b.left)
require.Zero(b.right)
require.Empty(b.List())
require.Zero(b.Len())
_, ok = b.Index(0)
require.False(ok)
_, ok = b.PeekLeft()
require.False(ok)
_, ok = b.PeekRight()
require.False(ok)
_, ok = b.PopRight()
require.False(ok)
b.PushLeft(1) // slice is [EMPTY,EMPTY,EMPTY,1]
require.Equal(1, b.Len())
require.Len(b.data, 4)
require.Equal(2, b.left)
require.Zero(b.right)
require.Equal([]int{1}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(1, got)
got, ok = b.PeekLeft()
require.True(ok)
require.Equal(1, got)
got, ok = b.PeekRight()
require.True(ok)
require.Equal(1, got)
// Test right wrapping around to the right
got, ok = b.PopRight() // slice is [EMPTY,EMPTY,EMPTY,EMPTY]
require.True(ok)
require.Equal(1, got)
require.Zero(b.Len())
require.Len(b.data, 4)
require.Equal(2, b.left)
require.Equal(3, b.right)
require.Empty(b.List())
require.Zero(b.Len())
_, ok = b.Index(0)
require.False(ok)
_, ok = b.PeekLeft()
require.False(ok)
_, ok = b.PeekRight()
require.False(ok)
// Tests right wrapping around to the left
b.PushRight(2) // slice is [EMPTY,EMPTY,EMPTY,2]
require.Equal(1, b.Len())
require.Len(b.data, 4)
require.Equal(2, b.left)
require.Zero(b.right)
require.Equal([]int{2}, b.List())
got, ok = b.Index(0)
require.True(ok)
require.Equal(2, got)
got, ok = b.PeekLeft()
require.True(ok)
require.Equal(2, got)
got, ok = b.PeekRight()
require.True(ok)
require.Equal(2, got)
got, ok = b.PopRight() // slice is [EMPTY,EMPTY,EMPTY,EMPTY]
require.True(ok)
require.Equal(2, got)
require.Empty(b.List())
_, ok = b.Index(0)
require.False(ok)
_, ok = b.PeekLeft()
require.False(ok)
_, ok = b.PeekRight()
require.False(ok)
_, ok = b.PopRight()
require.False(ok)
}
func FuzzUnboundedSliceDeque(f *testing.F) {
f.Fuzz(
func(t *testing.T, initSize uint, input []byte) {
require := require.New(t)
b := NewUnboundedDeque[byte](int(initSize))
for i, n := range input {
b.PushRight(n)
gotIndex, ok := b.Index(i)
require.True(ok)
require.Equal(n, gotIndex)
}
list := b.List()
require.Len(list, len(input))
for i, n := range input {
require.Equal(n, list[i])
}
for i := 0; i < len(input); i++ {
_, _ = b.PopLeft()
list = b.List()
if i == len(input)-1 {
require.Empty(list)
_, ok := b.Index(0)
require.False(ok)
} else {
require.Equal(input[i+1:], list)
got, ok := b.Index(0)
require.True(ok)
require.Equal(input[i+1], got)
}
}
},
)
}