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45 lines
1.7 KiB
Go
45 lines
1.7 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package flakytest contains test helpers for marking a test as flaky. For
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// tests run using cmd/testwrapper, a failed flaky test will cause tests to be
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// re-run a few time until they succeed or exceed our iteration limit.
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package flakytest
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import (
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"fmt"
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"os"
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"regexp"
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"testing"
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)
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// FlakyTestLogMessage is a sentinel value that is printed to stderr when a
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// flaky test is marked. This is used by cmd/testwrapper to detect flaky tests
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// and retry them.
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const FlakyTestLogMessage = "flakytest: this is a known flaky test"
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// FlakeAttemptEnv is an environment variable that is set by cmd/testwrapper
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// when a flaky test is being (re)tried. It contains the attempt number,
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// starting at 1.
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const FlakeAttemptEnv = "TS_TESTWRAPPER_ATTEMPT"
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var issueRegexp = regexp.MustCompile(`\Ahttps://github\.com/tailscale/[a-zA-Z0-9_.-]+/issues/\d+\z`)
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// Mark sets the current test as a flaky test, such that if it fails, it will
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// be retried a few times on failure. issue must be a GitHub issue that tracks
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// the status of the flaky test being marked, of the format:
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//
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// https://github.com/tailscale/myRepo-H3re/issues/12345
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func Mark(t testing.TB, issue string) {
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if !issueRegexp.MatchString(issue) {
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t.Fatalf("bad issue format: %q", issue)
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}
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if _, ok := os.LookupEnv(FlakeAttemptEnv); ok {
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// We're being run under cmd/testwrapper so send our sentinel message
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// to stderr. (We avoid doing this when the env is absent to avoid
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// spamming people running tests without the wrapper)
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fmt.Fprintf(os.Stderr, "%s: %s\n", FlakyTestLogMessage, issue)
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}
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t.Logf("flakytest: issue tracking this flaky test: %s", issue)
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}
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