1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package os_test
import (
. "os"
"reflect"
"strings"
"testing"
)
// testGetenv gives us a controlled set of variables for testing Expand.
func testGetenv(s string) string {
switch s {
case "*":
return "all the args"
case "#":
return "NARGS"
case "$":
return "PID"
case "1":
return "ARGUMENT1"
case "HOME":
return "/usr/gopher"
case "H":
return "(Value of H)"
case "home_1":
return "/usr/foo"
case "_":
return "underscore"
}
return ""
}
var expandTests = []struct {
in, out string
}{
{"", ""},
{"$*", "all the args"},
{"$$", "PID"},
{"${*}", "all the args"},
{"$1", "ARGUMENT1"},
{"${1}", "ARGUMENT1"},
{"now is the time", "now is the time"},
{"$HOME", "/usr/gopher"},
{"$home_1", "/usr/foo"},
{"${HOME}", "/usr/gopher"},
{"${H}OME", "(Value of H)OME"},
{"A$$$#$1$H$home_1*B", "APIDNARGSARGUMENT1(Value of H)/usr/foo*B"},
{"start$+middle$^end$", "start$+middle$^end$"},
{"mixed$|bag$$$", "mixed$|bagPID$"},
{"$", "$"},
{"$}", "$}"},
{"${", ""}, // invalid syntax; eat up the characters
{"${}", ""}, // invalid syntax; eat up the characters
}
func TestExpand(t *testing.T) {
for _, test := range expandTests {
result := Expand(test.in, testGetenv)
if result != test.out {
t.Errorf("Expand(%q)=%q; expected %q", test.in, result, test.out)
}
}
}
var global any
func BenchmarkExpand(b *testing.B) {
b.Run("noop", func(b *testing.B) {
var s string
b.ReportAllocs()
for i := 0; i < b.N; i++ {
s = Expand("tick tick tick tick", func(string) string { return "" })
}
global = s
})
b.Run("multiple", func(b *testing.B) {
var s string
b.ReportAllocs()
for i := 0; i < b.N; i++ {
s = Expand("$a $a $a $a", func(string) string { return "boom" })
}
global = s
})
}
func TestConsistentEnviron(t *testing.T) {
e0 := Environ()
for i := 0; i < 10; i++ {
e1 := Environ()
if !reflect.DeepEqual(e0, e1) {
t.Fatalf("environment changed")
}
}
}
func TestUnsetenv(t *testing.T) {
const testKey = "GO_TEST_UNSETENV"
set := func() bool {
prefix := testKey + "="
for _, key := range Environ() {
if strings.HasPrefix(key, prefix) {
return true
}
}
return false
}
if err := Setenv(testKey, "1"); err != nil {
t.Fatalf("Setenv: %v", err)
}
if !set() {
t.Error("Setenv didn't set TestUnsetenv")
}
if err := Unsetenv(testKey); err != nil {
t.Fatalf("Unsetenv: %v", err)
}
if set() {
t.Fatal("Unsetenv didn't clear TestUnsetenv")
}
}
func TestClearenv(t *testing.T) {
const testKey = "GO_TEST_CLEARENV"
const testValue = "1"
// reset env
defer func(origEnv []string) {
for _, pair := range origEnv {
// Environment variables on Windows can begin with =
// https://devblogs.microsoft.com/oldnewthing/20100506-00/?p=14133
i := strings.Index(pair[1:], "=") + 1
if err := Setenv(pair[:i], pair[i+1:]); err != nil {
t.Errorf("Setenv(%q, %q) failed during reset: %v", pair[:i], pair[i+1:], err)
}
}
}(Environ())
if err := Setenv(testKey, testValue); err != nil {
t.Fatalf("Setenv(%q, %q) failed: %v", testKey, testValue, err)
}
if _, ok := LookupEnv(testKey); !ok {
t.Errorf("Setenv(%q, %q) didn't set $%s", testKey, testValue, testKey)
}
Clearenv()
if val, ok := LookupEnv(testKey); ok {
t.Errorf("Clearenv() didn't clear $%s, remained with value %q", testKey, val)
}
}
func TestLookupEnv(t *testing.T) {
const smallpox = "SMALLPOX" // No one has smallpox.
value, ok := LookupEnv(smallpox) // Should not exist.
if ok || value != "" {
t.Fatalf("%s=%q", smallpox, value)
}
defer Unsetenv(smallpox)
err := Setenv(smallpox, "virus")
if err != nil {
t.Fatalf("failed to release smallpox virus")
}
_, ok = LookupEnv(smallpox)
if !ok {
t.Errorf("smallpox release failed; world remains safe but LookupEnv is broken")
}
}
// On Windows, Environ was observed to report keys with a single leading "=".
// Check that they are properly reported by LookupEnv and can be set by SetEnv.
// See https://golang.org/issue/49886.
func TestEnvironConsistency(t *testing.T) {
t.Parallel()
for _, kv := range Environ() {
i := strings.Index(kv, "=")
if i == 0 {
// We observe in practice keys with a single leading "=" on Windows.
// TODO(#49886): Should we consume only the first leading "=" as part
// of the key, or parse through arbitrarily many of them until a non-=,
// or try each possible key/value boundary until LookupEnv succeeds?
i = strings.Index(kv[1:], "=") + 1
}
if i < 0 {
t.Errorf("Environ entry missing '=': %q", kv)
}
k := kv[:i]
v := kv[i+1:]
v2, ok := LookupEnv(k)
if ok && v == v2 {
t.Logf("LookupEnv(%q) = %q, %t", k, v2, ok)
} else {
t.Errorf("Environ contains %q, but LookupEnv(%q) = %q, %t", kv, k, v2, ok)
}
// Since k=v is already present in the environment,
// setting it should be a no-op.
if err := Setenv(k, v); err == nil {
t.Logf("Setenv(%q, %q)", k, v)
} else {
t.Errorf("Environ contains %q, but SetEnv(%q, %q) = %q", kv, k, v, err)
}
}
}
|
