/
util.go
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/
util.go
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// Copyright Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package test
import (
"context"
"os"
"go.uber.org/atomic"
)
// SetForTest sets a variable for the duration of a test, then resets it once the test is complete.
func SetForTest[T any](t Failer, vv *T, v T) {
old := *vv
*vv = v
t.Cleanup(func() {
*vv = old
})
}
// SetEnvForTest sets an environment variable for the duration of a test, then resets it once the test is complete.
func SetEnvForTest(t Failer, k, v string) {
old, oldset := os.LookupEnv(k)
if err := os.Setenv(k, v); err != nil {
t.Fatal(err)
}
t.Cleanup(func() {
if oldset {
if err := os.Setenv(k, old); err != nil {
t.Fatal(err)
}
} else {
if err := os.Unsetenv(k); err != nil {
t.Fatal(err)
}
}
})
}
// SetAtomicBoolForTest sets a variable for the duration of a test, then resets it once the test is complete atomically.
func SetAtomicBoolForTest(t Failer, vv *atomic.Bool, v bool) {
old := vv.Load()
vv.Store(v)
t.Cleanup(func() {
vv.Store(old)
})
}
// NewStop returns a stop channel that will automatically be closed when the test is complete
func NewStop(t Failer) chan struct{} {
s := make(chan struct{})
t.Cleanup(func() {
close(s)
})
return s
}
// NewContext returns a context that will automatically be closed when the test is complete
func NewContext(t Failer) context.Context {
ctx, cancel := context.WithCancel(context.Background())
t.Cleanup(cancel)
return ctx
}