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tailscale/cmd/k8s-operator/sts_test.go

42 lines
1.5 KiB
Go

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