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- // Copyright 2019 Google Inc. All rights reserved.
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
- package android
- import (
- "testing"
- "time"
- )
- func TestOncePer_Once(t *testing.T) {
- once := OncePer{}
- key := NewOnceKey("key")
- a := once.Once(key, func() interface{} { return "a" }).(string)
- b := once.Once(key, func() interface{} { return "b" }).(string)
- if a != "a" {
- t.Errorf(`first call to Once should return "a": %q`, a)
- }
- if b != "a" {
- t.Errorf(`second call to Once with the same key should return "a": %q`, b)
- }
- }
- func TestOncePer_Once_wait(t *testing.T) {
- once := OncePer{}
- key := NewOnceKey("key")
- ch := make(chan bool)
- go once.Once(key, func() interface{} { close(ch); time.Sleep(100 * time.Millisecond); return "foo" })
- <-ch
- a := once.Once(key, func() interface{} { return "bar" }).(string)
- if a != "foo" {
- t.Errorf("expect %q, got %q", "foo", a)
- }
- }
- func TestOncePer_Get(t *testing.T) {
- once := OncePer{}
- key := NewOnceKey("key")
- a := once.Once(key, func() interface{} { return "a" }).(string)
- b := once.Get(key).(string)
- if a != "a" {
- t.Errorf(`first call to Once should return "a": %q`, a)
- }
- if b != "a" {
- t.Errorf(`Get with the same key should return "a": %q`, b)
- }
- }
- func TestOncePer_Get_panic(t *testing.T) {
- once := OncePer{}
- key := NewOnceKey("key")
- defer func() {
- p := recover()
- if p == nil {
- t.Error("call to Get for unused key should panic")
- }
- }()
- once.Get(key)
- }
- func TestOncePer_Get_wait(t *testing.T) {
- once := OncePer{}
- key := NewOnceKey("key")
- ch := make(chan bool)
- go once.Once(key, func() interface{} { close(ch); time.Sleep(100 * time.Millisecond); return "foo" })
- <-ch
- a := once.Get(key).(string)
- if a != "foo" {
- t.Errorf("expect %q, got %q", "foo", a)
- }
- }
- func TestOncePer_OnceStringSlice(t *testing.T) {
- once := OncePer{}
- key := NewOnceKey("key")
- a := once.OnceStringSlice(key, func() []string { return []string{"a"} })
- b := once.OnceStringSlice(key, func() []string { return []string{"a"} })
- if a[0] != "a" {
- t.Errorf(`first call to OnceStringSlice should return ["a"]: %q`, a)
- }
- if b[0] != "a" {
- t.Errorf(`second call to OnceStringSlice with the same key should return ["a"]: %q`, b)
- }
- }
- func TestOncePer_Once2StringSlice(t *testing.T) {
- once := OncePer{}
- key := NewOnceKey("key")
- a, b := once.Once2StringSlice(key, func() ([]string, []string) { return []string{"a"}, []string{"b"} })
- c, d := once.Once2StringSlice(key, func() ([]string, []string) { return []string{"c"}, []string{"d"} })
- if a[0] != "a" || b[0] != "b" {
- t.Errorf(`first call to Once2StringSlice should return ["a"], ["b"]: %q, %q`, a, b)
- }
- if c[0] != "a" || d[0] != "b" {
- t.Errorf(`second call to Once2StringSlice with the same key should return ["a"], ["b"]: %q, %q`, c, d)
- }
- }
- func TestNewOnceKey(t *testing.T) {
- once := OncePer{}
- key1 := NewOnceKey("key")
- key2 := NewOnceKey("key")
- a := once.Once(key1, func() interface{} { return "a" }).(string)
- b := once.Once(key2, func() interface{} { return "b" }).(string)
- if a != "a" {
- t.Errorf(`first call to Once should return "a": %q`, a)
- }
- if b != "b" {
- t.Errorf(`second call to Once with the NewOnceKey from same string should return "b": %q`, b)
- }
- }
- func TestNewCustomOnceKey(t *testing.T) {
- type key struct {
- key string
- }
- once := OncePer{}
- key1 := NewCustomOnceKey(key{"key"})
- key2 := NewCustomOnceKey(key{"key"})
- a := once.Once(key1, func() interface{} { return "a" }).(string)
- b := once.Once(key2, func() interface{} { return "b" }).(string)
- if a != "a" {
- t.Errorf(`first call to Once should return "a": %q`, a)
- }
- if b != "a" {
- t.Errorf(`second call to Once with the NewCustomOnceKey from equal key should return "a": %q`, b)
- }
- }
- func TestOncePerReentrant(t *testing.T) {
- once := OncePer{}
- key1 := NewOnceKey("key")
- key2 := NewOnceKey("key")
- a := once.Once(key1, func() interface{} { return once.Once(key2, func() interface{} { return "a" }) })
- if a != "a" {
- t.Errorf(`reentrant Once should return "a": %q`, a)
- }
- }
- // Test that a recovered panic in a Once function doesn't deadlock
- func TestOncePerPanic(t *testing.T) {
- once := OncePer{}
- key := NewOnceKey("key")
- ch := make(chan interface{})
- var a interface{}
- go func() {
- defer func() {
- ch <- recover()
- }()
- a = once.Once(key, func() interface{} {
- panic("foo")
- })
- }()
- p := <-ch
- if p.(string) != "foo" {
- t.Errorf(`expected panic with "foo", got %#v`, p)
- }
- if a != nil {
- t.Errorf(`expected a to be nil, got %#v`, a)
- }
- // If the call to Once that panicked leaves the key in a bad state this will deadlock
- b := once.Once(key, func() interface{} {
- return "bar"
- })
- // The second call to Once should return nil inserted by the first call that panicked.
- if b != nil {
- t.Errorf(`expected b to be nil, got %#v`, b)
- }
- }
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