114 lines
2.2 KiB
Go
114 lines
2.2 KiB
Go
// Copyright (C) 2018 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package util
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import "testing"
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func TestZeroByteSemaphore(_ *testing.T) {
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// A semaphore with zero capacity is just a no-op.
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s := NewSemaphore(0)
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// None of these should block or panic
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s.Take(123)
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s.Take(456)
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s.Give(1 << 30)
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}
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func TestByteSemaphoreCapChangeUp(t *testing.T) {
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// Waiting takes should unblock when the capacity increases
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s := NewSemaphore(100)
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s.Take(75)
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if s.available != 25 {
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t.Error("bad state after take")
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}
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gotit := make(chan struct{})
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go func() {
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s.Take(75)
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close(gotit)
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}()
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s.SetCapacity(155)
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<-gotit
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if s.available != 5 {
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t.Error("bad state after both takes")
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}
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}
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func TestByteSemaphoreCapChangeDown1(t *testing.T) {
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// Things should make sense when capacity is adjusted down
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s := NewSemaphore(100)
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s.Take(75)
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if s.available != 25 {
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t.Error("bad state after take")
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}
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s.SetCapacity(90)
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if s.available != 15 {
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t.Error("bad state after adjust")
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}
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s.Give(75)
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if s.available != 90 {
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t.Error("bad state after give")
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}
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}
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func TestByteSemaphoreCapChangeDown2(t *testing.T) {
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// Things should make sense when capacity is adjusted down, different case
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s := NewSemaphore(100)
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s.Take(75)
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if s.available != 25 {
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t.Error("bad state after take")
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}
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s.SetCapacity(10)
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if s.available != 0 {
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t.Error("bad state after adjust")
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}
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s.Give(75)
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if s.available != 10 {
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t.Error("bad state after give")
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}
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}
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func TestByteSemaphoreGiveMore(t *testing.T) {
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// We shouldn't end up with more available than we have capacity...
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s := NewSemaphore(100)
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s.Take(150)
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if s.available != 0 {
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t.Errorf("bad state after large take")
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}
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s.Give(150)
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if s.available != 100 {
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t.Errorf("bad state after large take + give")
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}
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s.Take(150)
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s.SetCapacity(125)
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// available was zero before, we're increasing capacity by 25
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if s.available != 25 {
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t.Errorf("bad state after setcap")
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}
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s.Give(150)
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if s.available != 125 {
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t.Errorf("bad state after large take + give with adjustment")
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}
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}
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