58 lines
1.6 KiB
Go
58 lines
1.6 KiB
Go
// Copyright 2021 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package fuzz
|
|
|
|
import "testing"
|
|
|
|
func TestQueue(t *testing.T) {
|
|
// Zero valued queue should have 0 length and capacity.
|
|
var q queue
|
|
if n := q.len; n != 0 {
|
|
t.Fatalf("empty queue has len %d; want 0", n)
|
|
}
|
|
if n := q.cap(); n != 0 {
|
|
t.Fatalf("empty queue has cap %d; want 0", n)
|
|
}
|
|
|
|
// As we add elements, len should grow.
|
|
N := 32
|
|
for i := 0; i < N; i++ {
|
|
q.enqueue(i)
|
|
if n := q.len; n != i+1 {
|
|
t.Fatalf("after adding %d elements, queue has len %d", i, n)
|
|
}
|
|
if v, ok := q.peek(); !ok {
|
|
t.Fatalf("couldn't peek after adding %d elements", i)
|
|
} else if v.(int) != 0 {
|
|
t.Fatalf("after adding %d elements, peek is %d; want 0", i, v)
|
|
}
|
|
}
|
|
|
|
// As we remove and add elements, len should shrink and grow.
|
|
// We should also remove elements in the same order they were added.
|
|
want := 0
|
|
for _, r := range []int{1, 2, 3, 5, 8, 13, 21} {
|
|
s := make([]int, 0, r)
|
|
for i := 0; i < r; i++ {
|
|
if got, ok := q.dequeue(); !ok {
|
|
t.Fatalf("after removing %d of %d elements, could not dequeue", i+1, r)
|
|
} else if got != want {
|
|
t.Fatalf("after removing %d of %d elements, got %d; want %d", i+1, r, got, want)
|
|
} else {
|
|
s = append(s, got.(int))
|
|
}
|
|
want = (want + 1) % N
|
|
if n := q.len; n != N-i-1 {
|
|
t.Fatalf("after removing %d of %d elements, len is %d; want %d", i+1, r, n, N-i-1)
|
|
}
|
|
}
|
|
for i, v := range s {
|
|
q.enqueue(v)
|
|
if n := q.len; n != N-r+i+1 {
|
|
t.Fatalf("after adding back %d of %d elements, len is %d; want %d", i+1, r, n, n-r+i+1)
|
|
}
|
|
}
|
|
}
|
|
}
|