mirror of
https://github.com/tailscale/tailscale.git
synced 2024-12-04 23:45:34 +00:00
7455e027e9
We had this in a different repo, but moving it here, as this a more fitting package. Updates #cleanup Change-Id: I5fb9b10e465932aeef5841c67deba4d77d473d57 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
154 lines
3.6 KiB
Go
154 lines
3.6 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
package slicesx
|
|
|
|
import (
|
|
"reflect"
|
|
"slices"
|
|
"testing"
|
|
|
|
qt "github.com/frankban/quicktest"
|
|
)
|
|
|
|
func TestInterleave(t *testing.T) {
|
|
testCases := []struct {
|
|
name string
|
|
a, b []int
|
|
want []int
|
|
}{
|
|
{name: "equal", a: []int{1, 3, 5}, b: []int{2, 4, 6}, want: []int{1, 2, 3, 4, 5, 6}},
|
|
{name: "short_b", a: []int{1, 3, 5}, b: []int{2, 4}, want: []int{1, 2, 3, 4, 5}},
|
|
{name: "short_a", a: []int{1, 3}, b: []int{2, 4, 6}, want: []int{1, 2, 3, 4, 6}},
|
|
{name: "len_1", a: []int{1}, b: []int{2, 4, 6}, want: []int{1, 2, 4, 6}},
|
|
{name: "nil_a", a: nil, b: []int{2, 4, 6}, want: []int{2, 4, 6}},
|
|
{name: "nil_all", a: nil, b: nil, want: nil},
|
|
}
|
|
|
|
for _, tc := range testCases {
|
|
t.Run(tc.name, func(t *testing.T) {
|
|
merged := Interleave(tc.a, tc.b)
|
|
if !reflect.DeepEqual(merged, tc.want) {
|
|
t.Errorf("got %v; want %v", merged, tc.want)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func BenchmarkInterleave(b *testing.B) {
|
|
b.ReportAllocs()
|
|
b.ResetTimer()
|
|
for range b.N {
|
|
Interleave(
|
|
[]int{1, 2, 3},
|
|
[]int{9, 8, 7},
|
|
)
|
|
}
|
|
}
|
|
|
|
func TestShuffle(t *testing.T) {
|
|
var sl []int
|
|
for i := range 100 {
|
|
sl = append(sl, i)
|
|
}
|
|
|
|
var wasShuffled bool
|
|
for try := 0; try < 10; try++ {
|
|
shuffled := slices.Clone(sl)
|
|
Shuffle(shuffled)
|
|
if !reflect.DeepEqual(shuffled, sl) {
|
|
wasShuffled = true
|
|
break
|
|
}
|
|
}
|
|
|
|
if !wasShuffled {
|
|
t.Errorf("expected shuffle after 10 tries")
|
|
}
|
|
}
|
|
|
|
func TestPartition(t *testing.T) {
|
|
var sl []int
|
|
for i := 1; i <= 10; i++ {
|
|
sl = append(sl, i)
|
|
}
|
|
|
|
evens, odds := Partition(sl, func(elem int) bool {
|
|
return elem%2 == 0
|
|
})
|
|
|
|
wantEvens := []int{2, 4, 6, 8, 10}
|
|
wantOdds := []int{1, 3, 5, 7, 9}
|
|
if !reflect.DeepEqual(evens, wantEvens) {
|
|
t.Errorf("evens: got %v, want %v", evens, wantEvens)
|
|
}
|
|
if !reflect.DeepEqual(odds, wantOdds) {
|
|
t.Errorf("odds: got %v, want %v", odds, wantOdds)
|
|
}
|
|
}
|
|
|
|
func TestEqualSameNil(t *testing.T) {
|
|
c := qt.New(t)
|
|
c.Check(EqualSameNil([]string{"a"}, []string{"a"}), qt.Equals, true)
|
|
c.Check(EqualSameNil([]string{"a"}, []string{"b"}), qt.Equals, false)
|
|
c.Check(EqualSameNil([]string{"a"}, []string{}), qt.Equals, false)
|
|
c.Check(EqualSameNil([]string{}, []string{}), qt.Equals, true)
|
|
c.Check(EqualSameNil(nil, []string{}), qt.Equals, false)
|
|
c.Check(EqualSameNil([]string{}, nil), qt.Equals, false)
|
|
c.Check(EqualSameNil[[]string](nil, nil), qt.Equals, true)
|
|
}
|
|
|
|
func TestFilter(t *testing.T) {
|
|
var sl []int
|
|
for i := 1; i <= 10; i++ {
|
|
sl = append(sl, i)
|
|
}
|
|
|
|
evens := Filter(nil, sl, func(elem int) bool {
|
|
return elem%2 == 0
|
|
})
|
|
|
|
want := []int{2, 4, 6, 8, 10}
|
|
if !reflect.DeepEqual(evens, want) {
|
|
t.Errorf("evens: got %v, want %v", evens, want)
|
|
}
|
|
}
|
|
|
|
func TestFilterNoAllocations(t *testing.T) {
|
|
var sl []int
|
|
for i := 1; i <= 10; i++ {
|
|
sl = append(sl, i)
|
|
}
|
|
|
|
want := []int{2, 4, 6, 8, 10}
|
|
allocs := testing.AllocsPerRun(1000, func() {
|
|
src := slices.Clone(sl)
|
|
evens := Filter(src[:0], src, func(elem int) bool {
|
|
return elem%2 == 0
|
|
})
|
|
if !slices.Equal(evens, want) {
|
|
t.Errorf("evens: got %v, want %v", evens, want)
|
|
}
|
|
})
|
|
|
|
// 1 alloc for 'src', nothing else
|
|
if allocs != 1 {
|
|
t.Fatalf("got %.4f allocs, want 1", allocs)
|
|
}
|
|
}
|
|
|
|
func TestAppendMatching(t *testing.T) {
|
|
v := []string{"one", "two", "three", "four"}
|
|
got := AppendMatching(v[:0], v, func(s string) bool { return len(s) > 3 })
|
|
|
|
want := []string{"three", "four"}
|
|
if !reflect.DeepEqual(got, want) {
|
|
t.Errorf("got %v; want %v", got, want)
|
|
}
|
|
|
|
wantOrigMem := []string{"three", "four", "three", "four"}
|
|
if !reflect.DeepEqual(v, wantOrigMem) {
|
|
t.Errorf("got %v; want %v", v, wantOrigMem)
|
|
}
|
|
}
|