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
|
package flagenv_test
import (
"flag"
"fmt"
"os"
"regexp"
"strings"
"testing"
"within.website/x/internal/flagenv"
"github.com/facebookgo/ensure"
)
func named(t, v string) string { return strings.ToUpper(t + v) }
func ExampleParse() {
var raz string
flag.StringVar(&raz, "raz-value", "bar", "set the raz")
// override default flag value with value found in MY_RAZ_VALUE
flagenv.Prefix = "my_"
flagenv.Parse()
// override value found in MY_RAZ_VALUE with command line flag value -raz-value=foo
flag.Parse()
}
func TestNothingToDo(t *testing.T) {
const name = "TestNothingToDo"
s := flag.NewFlagSet(name, flag.PanicOnError)
s.String(named(name, "foo"), "", "")
ensure.Nil(t, flagenv.ParseSet(name, s))
}
func TestAFewFlags(t *testing.T) {
const name = "TestAFewFlags"
s := flag.NewFlagSet(name, flag.PanicOnError)
const foo = "42"
const bar = int(43)
fooActual := s.String("foo", "", "")
barActual := s.Int("bar", 0, "")
os.Setenv(named(name, "foo"), foo)
os.Setenv(named(name, "bar"), fmt.Sprint(bar))
ensure.Nil(t, flagenv.ParseSet(name, s))
ensure.DeepEqual(t, *fooActual, foo)
ensure.DeepEqual(t, *barActual, bar)
}
func TestInvalidFlagValue(t *testing.T) {
const name = "TestInvalidFlagValue"
s := flag.NewFlagSet(name, flag.PanicOnError)
s.Int("bar", 0, "")
os.Setenv(named(name, "bar"), "a")
ensure.Err(t, flagenv.ParseSet(name, s),
regexp.MustCompile(`failed to set flag "bar" with value "a"`))
}
func TestReturnsFirstError(t *testing.T) {
const name = "TestReturnsFirstError"
s := flag.NewFlagSet(name, flag.PanicOnError)
s.Int("bar1", 0, "")
s.Int("bar2", 0, "")
os.Setenv(named(name, "bar1"), "a")
ensure.Err(t, flagenv.ParseSet(name, s),
regexp.MustCompile(`failed to set flag "bar1" with value "a"`))
}
func TestExplicitAreIgnored(t *testing.T) {
const name = "TestExplicitAreIgnored"
s := flag.NewFlagSet(name, flag.PanicOnError)
const bar = int(43)
barActual := s.Int("bar", 0, "")
s.Parse([]string{"-bar", fmt.Sprint(bar)})
os.Setenv(named(name, "bar"), "44")
ensure.Nil(t, flagenv.ParseSet(name, s))
ensure.DeepEqual(t, *barActual, bar)
}
func TestGlobalParse(t *testing.T) {
flagenv.Parse()
}
|
