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Scott Baker2d897982019-09-24 11:50:08 -07001// Copyright (c) 2016 Uber Technologies, Inc.
2//
3// Permission is hereby granted, free of charge, to any person obtaining a copy
4// of this software and associated documentation files (the "Software"), to deal
5// in the Software without restriction, including without limitation the rights
6// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7// copies of the Software, and to permit persons to whom the Software is
8// furnished to do so, subject to the following conditions:
9//
10// The above copyright notice and this permission notice shall be included in
11// all copies or substantial portions of the Software.
12//
13// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
19// THE SOFTWARE.
20
21// Package exit provides stubs so that unit tests can exercise code that calls
22// os.Exit(1).
23package exit
24
25import "os"
26
27var real = func() { os.Exit(1) }
28
29// Exit normally terminates the process by calling os.Exit(1). If the package
30// is stubbed, it instead records a call in the testing spy.
31func Exit() {
32 real()
33}
34
35// A StubbedExit is a testing fake for os.Exit.
36type StubbedExit struct {
37 Exited bool
38 prev func()
39}
40
41// Stub substitutes a fake for the call to os.Exit(1).
42func Stub() *StubbedExit {
43 s := &StubbedExit{prev: real}
44 real = s.exit
45 return s
46}
47
48// WithStub runs the supplied function with Exit stubbed. It returns the stub
49// used, so that users can test whether the process would have crashed.
50func WithStub(f func()) *StubbedExit {
51 s := Stub()
52 defer s.Unstub()
53 f()
54 return s
55}
56
57// Unstub restores the previous exit function.
58func (se *StubbedExit) Unstub() {
59 real = se.prev
60}
61
62func (se *StubbedExit) exit() {
63 se.Exited = true
64}