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49 lines
1.1 KiB
Go
49 lines
1.1 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package tstest provides utilities for use in unit tests.
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package tstest
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import (
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"context"
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"testing"
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"time"
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"tailscale.com/logtail/backoff"
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"tailscale.com/types/logger"
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)
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// Replace replaces the value of target with val.
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// The old value is restored when the test ends.
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func Replace[T any](t testing.TB, target *T, val T) {
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t.Helper()
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if target == nil {
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t.Fatalf("Replace: nil pointer")
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panic("unreachable") // pacify staticcheck
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}
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old := *target
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t.Cleanup(func() {
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*target = old
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})
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*target = val
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return
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}
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// WaitFor retries try for up to maxWait.
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// It returns nil once try returns nil the first time.
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// If maxWait passes without success, it returns try's last error.
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func WaitFor(maxWait time.Duration, try func() error) error {
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bo := backoff.NewBackoff("wait-for", logger.Discard, maxWait/4)
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deadline := time.Now().Add(maxWait)
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var err error
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for time.Now().Before(deadline) {
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err = try()
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if err == nil {
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break
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}
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bo.BackOff(context.Background(), err)
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}
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return err
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}
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