mirror of
https://github.com/tailscale/tailscale.git
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83 lines
1.8 KiB
Go
83 lines
1.8 KiB
Go
// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package flowtrack
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import (
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"testing"
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"inet.af/netaddr"
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)
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func TestCache(t *testing.T) {
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c := &Cache{MaxEntries: 2}
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k1 := Tuple{Src: netaddr.MustParseIPPort("1.1.1.1:1"), Dst: netaddr.MustParseIPPort("1.1.1.1:1")}
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k2 := Tuple{Src: netaddr.MustParseIPPort("1.1.1.1:1"), Dst: netaddr.MustParseIPPort("2.2.2.2:2")}
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k3 := Tuple{Src: netaddr.MustParseIPPort("1.1.1.1:1"), Dst: netaddr.MustParseIPPort("3.3.3.3:3")}
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k4 := Tuple{Src: netaddr.MustParseIPPort("1.1.1.1:1"), Dst: netaddr.MustParseIPPort("4.4.4.4:4")}
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wantLen := func(want int) {
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t.Helper()
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if got := c.Len(); got != want {
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t.Fatalf("Len = %d; want %d", got, want)
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}
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}
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wantVal := func(key Tuple, want interface{}) {
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t.Helper()
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got, ok := c.Get(key)
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if !ok {
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t.Fatalf("Get(%q) failed; want value %v", key, want)
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}
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if got != want {
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t.Fatalf("Get(%q) = %v; want %v", key, got, want)
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}
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}
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wantMissing := func(key Tuple) {
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t.Helper()
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if got, ok := c.Get(key); ok {
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t.Fatalf("Get(%q) = %v; want absent from cache", key, got)
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}
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}
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wantLen(0)
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c.RemoveOldest() // shouldn't panic
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c.Remove(k4) // shouldn't panic
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c.Add(k1, 1)
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wantLen(1)
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c.Add(k2, 2)
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wantLen(2)
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c.Add(k3, 3)
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wantLen(2) // hit the max
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wantMissing(k1)
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c.Remove(k1)
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wantLen(2) // no change; k1 should've been the deleted one per LRU
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wantVal(k3, 3)
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wantVal(k2, 2)
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c.Remove(k2)
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wantLen(1)
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wantMissing(k2)
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c.Add(k3, 30)
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wantVal(k3, 30)
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wantLen(1)
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allocs := int(testing.AllocsPerRun(1000, func() {
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got, ok := c.Get(k3)
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if !ok {
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t.Fatal("missing k3")
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}
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if got != 30 {
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t.Fatalf("got = %d; want 30", got)
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}
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}))
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if allocs != 0 {
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t.Errorf("allocs = %v; want 0", allocs)
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}
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}
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