forked from mirror/viper
43 lines
1.0 KiB
Go
43 lines
1.0 KiB
Go
package testutil
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import (
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"os"
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"testing"
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)
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// Based on https://github.com/frankban/quicktest/blob/577841610793d24f99e31cc2c0ef3a541fefd7c7/patch.go#L34-L64
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// Licensed under the MIT license
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// Copyright (c) 2017 Canonical Ltd.
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// Setenv sets an environment variable to a temporary value for the
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// duration of the test.
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//
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// At the end of the test (see "Deferred execution" in the package docs), the
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// environment variable is returned to its original value.
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func Setenv(t *testing.T, name, val string) {
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setenv(t, name, val, true)
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}
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// Unsetenv unsets an environment variable for the duration of a test.
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func Unsetenv(t *testing.T, name string) {
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setenv(t, name, "", false)
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}
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// setenv sets or unsets an environment variable to a temporary value for the
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// duration of the test
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func setenv(t *testing.T, name, val string, valOK bool) {
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oldVal, oldOK := os.LookupEnv(name)
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if valOK {
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os.Setenv(name, val)
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} else {
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os.Unsetenv(name)
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}
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t.Cleanup(func() {
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if oldOK {
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os.Setenv(name, oldVal)
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} else {
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os.Unsetenv(name)
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}
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})
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}
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