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package envflag
import (
"flag"
"os"
"testing"
)
func TestParseFlagSet(t *testing.T) {
tests := map[string]struct {
// Flag name
name string
// Default value
def string
// Flag command values
values []string
opts []Option
// The environment
env map[string]string
expected string
usage string
}{
"no flags no env default": {
name: "testing-123",
def: "defaultvalue",
expected: "defaultvalue",
},
"flags no env no default": {
name: "testing-123",
values: []string{"-testing-123", "passed"},
expected: "passed",
},
"no flags env": {
name: "testing-123",
env: map[string]string{"TESTING_123": "fromenv"},
expected: "fromenv",
},
"flags with no env": {
name: "testing-123",
values: []string{"-testing-123", "passed"},
expected: "passed",
},
"flags with env": {
// Flags take precedence
name: "testing-123",
values: []string{"-testing-123", "passed"},
env: map[string]string{"TESTING_123": "fromenv"},
expected: "passed",
},
"no flags with env": {
// Flags take precedence
name: "testing-123",
env: map[string]string{"TESTING_123": "fromenv"},
expected: "fromenv",
},
"flags with env and suffix": {
name: "testing-123",
values: []string{"-testing-123", "passed"},
opts: []Option{UsageSuffixer()},
env: map[string]string{"TESTING_123": "fromenv"},
expected: "passed",
},
"no flags with env and suffix": {
name: "testing-123",
def: "defaultvalue",
opts: []Option{UsageSuffixer()},
env: map[string]string{"TESTING_123": "fromenv"},
expected: "fromenv",
},
"a variety of characters": {
// Flags take precedence
name: "tes_t.ing----123",
env: map[string]string{"TES_T_ING_123": "fromenv"},
expected: "fromenv",
},
"prefixed-no-flag": {
// Flags take precedence
name: "testing-123",
values: []string{},
opts: []Option{Prefix("APP_")},
env: map[string]string{"APP_TESTING_123": "fromenv"},
expected: "fromenv",
},
"prefixed-with-flag": {
// Flags take precedence
name: "testing-123",
values: []string{"-testing-123", "passed"},
opts: []Option{Prefix("APP_")},
env: map[string]string{"APP_TESTING_123": "fromenv"},
expected: "passed",
},
}
for name, tt := range tests {
t.Run(name, func(t *testing.T) {
fs := flag.NewFlagSet("test", flag.ExitOnError)
for k, v := range tt.env {
os.Setenv(k, v)
}
defer func() {
for k := range tt.env {
os.Unsetenv(k)
}
}()
actual := fs.String(tt.name, tt.def, "usage")
ParseFlagSet(fs, tt.values, tt.opts...)
if *actual != tt.expected {
t.Errorf("got %q, want %q", *actual, tt.expected)
}
})
}
}
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