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f3b9e0ddc9
T.Setenv ensures that the environment is returned to its prior state when the test ends. It also panics when called from a parallel test to prevent racy test interdependencies. Similarly, T.Cleanup ensures the environment is restored after a test or any of its parallel sub-tests call os.Unsetenv.
135 lines
3.1 KiB
Go
135 lines
3.1 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"os"
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"testing"
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)
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func setEnvVar(t *testing.T, env, val string, exists bool) {
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if exists {
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t.Setenv(env, val)
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} else if prev, ok := os.LookupEnv(env); ok {
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t.Cleanup(func() { os.Setenv(env, prev) })
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if err := os.Unsetenv(env); err != nil {
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t.Errorf("couldn't unset env %s: %v", env, err)
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}
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}
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}
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func TestFallbackToEnv(t *testing.T) {
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testCases := []struct {
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desc string
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env string
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value string
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valueSet bool
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expectedValue string
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expectedError bool
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}{
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{
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desc: "value unset",
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env: "FOO",
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valueSet: false,
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expectedValue: "",
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expectedError: true,
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},
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{
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desc: "value set empty",
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env: "FOO",
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value: "",
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valueSet: true,
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expectedValue: "",
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expectedError: true,
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},
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{
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desc: "value set",
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env: "FOO",
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value: "foo",
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valueSet: true,
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expectedValue: "foo",
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expectedError: false,
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},
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}
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for _, test := range testCases {
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t.Run(test.desc, func(t *testing.T) {
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setEnvVar(t, test.env, test.value, test.valueSet)
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value, err := fallbackToEnv("some-flag", test.env)
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if test.expectedError {
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if err == nil {
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t.Errorf("expected error, got: %v", err)
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}
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} else {
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if err != nil {
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t.Errorf("unexpected error: %v", err)
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}
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if value != test.expectedValue {
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t.Errorf("unexpected result: %s, expected: %s", value, test.expectedValue)
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}
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}
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})
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}
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}
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func TestFallbackToEnvWithDefault(t *testing.T) {
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testCases := []struct {
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desc string
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env string
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value string
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valueSet bool
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defaultValue string
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expectedValue string
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expectedError bool
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}{
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{
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desc: "value unset",
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env: "FOO",
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valueSet: false,
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defaultValue: "default",
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expectedValue: "default",
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},
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{
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desc: "value set empty",
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env: "FOO",
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value: "",
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valueSet: true,
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defaultValue: "default",
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expectedValue: "default",
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},
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{
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desc: "value set",
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env: "FOO",
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value: "foo",
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valueSet: true,
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defaultValue: "default",
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expectedValue: "foo",
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},
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}
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for _, test := range testCases {
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t.Run(test.desc, func(t *testing.T) {
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setEnvVar(t, test.env, test.value, test.valueSet)
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value := fallbackToEnvWithDefault("some-flag", test.env, test.defaultValue)
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if value != test.expectedValue {
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t.Errorf("unexpected result: %s, expected: %s", value, test.expectedValue)
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}
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})
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}
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}
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