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42 lines
1.5 KiB
Go
42 lines
1.5 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build !plan9
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package main
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import (
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"fmt"
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"regexp"
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"strings"
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"testing"
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)
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// Test_statefulSetNameBase tests that parent name portion in a StatefulSet name
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// base will be truncated if the parent name is longer than 43 chars to ensure
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// that the total does not exceed 52 chars.
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// How many chars need to be cut off parent name depends on an internal var in
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// kube name generation code that can change at which point this test will break
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// and need to be changed. This is okay as we do not rely on that value in
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// code whilst being aware when it changes might still be useful.
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// https://github.com/kubernetes/kubernetes/blob/v1.28.4/staging/src/k8s.io/apiserver/pkg/storage/names/generate.go#L45.
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// https://github.com/kubernetes/kubernetes/pull/116430
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func Test_statefulSetNameBase(t *testing.T) {
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// Service name lengths can be 1 - 63 chars, be paranoid and test them all.
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var b strings.Builder
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for b.Len() < 63 {
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if _, err := b.WriteString("a"); err != nil {
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t.Fatalf("error writing to string builder: %v", err)
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}
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baseLength := b.Len()
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if baseLength > 43 {
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baseLength = 43 // currently 43 is the max base length
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}
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wantsNameR := regexp.MustCompile(`^ts-a{` + fmt.Sprint(baseLength) + `}-$`) // to match a string like ts-aaaa-
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gotName := statefulSetNameBase(b.String())
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if !wantsNameR.MatchString(gotName) {
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t.Fatalf("expected string %s to match regex %s ", gotName, wantsNameR.String()) // fatal rather than error as this test is called 63 times
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}
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}
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}
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