mesh-catalog/modules/betterbird/cmd/betterbird-tools/config_test.go

package main

import (
	"archive/zip"
	"encoding/json"
	"os"
	"path/filepath"
	"reflect"
	"strings"
	"testing"
)

// The configuration the module ships (novox/hq issue 345): the policy's locks, the module's defaults file, and the
// tools that show the layers, flag drift, clear it and propose a node layer.

// shippedDefaultsWant is the DEFAULT layer the operator approved on 2026-10-12: the laptop's setup, with
// reminders missed while asleep shown at the next start and chat off.
var shippedDefaultsWant = map[string]string{
	"mail.uidensity":                                "0",
	"mail.uifontsize":                               "14",
	"mail.dark-reader.enabled":                      "false",
	"mail.pane_config.dynamic":                      "2",
	"mail.pane_config.multiline_all":                "true",
	"mail.threadpane.listview":                      "0",
	"mailnews.default_view_flags":                   "1",
	"mail.warn_on_shift_delete":                     "false",
	"mail.biff.show_alert":                          "false",
	"mail.biff.play_sound":                          "false",
	"mail.biff.show_tray_icon":                      "false",
	"mail.biff.use_system_alert":                    "true",
	"calendar.view.daystarthour":                    "9",
	"calendar.view.dayendhour":                      "20",
	"calendar.item.promptDelete":                    "false",
	"calendar.timezone.useSystemTimezone":           "true",
	"calendar.alarms.show":                          "true",
	"calendar.alarms.showmissed":                    "true",
	"mail.chat.enabled":                             "false",
	"mailnews.message_display.disable_remote_image": "true",
	"privacy.donottrackheader.enabled":              "true",
}

var shippedKeepsWant = []string{"extensions.activeThemeID", "browser.display.use_system_colors",
	"layout.css.always_underline_links", "mail.spam.manualMark", "mail.compose.show_attachment_pane"}

func repoFile(t *testing.T, rel string) []byte {
	t.Helper()
	raw, err := os.ReadFile(filepath.Join("..", "..", rel))
	if err != nil {
		t.Fatal(err)
	}
	return raw
}

// withDefaults places the module's defaults file as the push does.
func (f *fake) withDefaults() {
	f.t.Helper()
	f.write(meshDefaults, string(repoFile(f.t, "install/defaults-pref/mesh-defaults.js")))
}

// omni places a packed application holding the given files.
func (f *fake) omni(files map[string]string) {
	f.t.Helper()
	full := filepath.Join(f.Root, omniJa)
	if err := os.MkdirAll(filepath.Dir(full), 0o755); err != nil {
		f.t.Fatal(err)
	}
	out, err := os.Create(full)
	if err != nil {
		f.t.Fatal(err)
	}
	w := zip.NewWriter(out)
	for name, body := range files {
		e, _ := w.Create(name)
		e.Write([]byte(body))
	}
	w.Close()
	out.Close()
}

// betterbirdsOwn is a small omni.ja: two files that contradict each other, as all-thunderbird.js and
// mailnews.js do in the pinned release.
func (f *fake) betterbirdsOwn() {
	f.omni(map[string]string{
		"greprefs.js": `pref("gfx.webrender.software", false);` + "\n",
		"defaults/pref/all-thunderbird.js": `pref("offline.autoDetect", true);` + "\n" +
			`pref("mail.threadpane.listview", 1);` + "\n" + `pref("mail.uidensity", 1);` + "\n" +
			`pref("mail.shell.checkDefaultClient", true);` + "\n",
		"defaults/pref/mailnews.js": `pref("offline.autoDetect", false);` + "\n" +
			`pref("mail.biff.show_alert", true); // a comment after it` + "\n" + `pref("mail.spam.manualMark", false);` + "\n" +
			`pref("mailnews.start_page.enabled", true);` + "\n",
		"defaults/pref/calendar.js": `pref("calendar.alarms.showmissed", false);` + "\n",
		"chrome/other.js":           `pref("not.a.default", 1);` + "\n",
	})
}

func stopBetterbird(t *testing.T, f *fake) {
	t.Helper()
	for _, pid := range []string{"4000", "4001"} {
		if err := os.RemoveAll(filepath.Join(f.Root, "proc", pid)); err != nil {
			t.Fatal(err)
		}
	}
}

func TestTheModuleShipsTheApprovedLocksAndDefaults(t *testing.T) {
	m, _ := readManifest(t)
	if a := artifact(t, m, "defaults"); a["from"] != "install/defaults-pref" {
		t.Fatalf("the defaults file ships through the defaults artifact: %v", a)
	}
	if r := resource(t, m, "spelling"); r["path"] != prefDir || r["artifact"] != "defaults" {
		t.Fatalf("placed in Betterbird's own defaults directory: %v", r)
	}
	raw := repoFile(t, "install/distribution/policies.json")
	if why := policyProblem(raw); why != "" {
		t.Fatal(why)
	}
	var p struct {
		Policies map[string]json.RawMessage `json:"policies"`
	}
	if err := json.Unmarshal(raw, &p); err != nil {
		t.Fatal(err)
	}
	for k, want := range map[string]string{"DisableAppUpdate": "true", "DisableTelemetry": "true", "ExtensionUpdate": "false"} {
		if string(p.Policies[k]) != want {
			t.Errorf("%s is %s, not %s", k, p.Policies[k], want)
		}
	}
	prefs := policyPrefsOf(raw)
	for _, n := range []string{"mail.shell.checkDefaultClient", "mail.inappnotifications.enabled", "mailnews.start_page.enabled"} {
		if prefs[n] != (policyPref{Value: "false", Locked: true}) {
			t.Errorf("%s is locked off: %+v", n, prefs[n])
		}
	}
	// Betterbird's Preferences policy accepts only these prefixes (Policies.sys.mjs); privacy. and toolkit. are not.
	allowed := []string{"accessibility.", "app.update.", "browser.", "calendar.", "chat.", "datareporting.policy.", "dom.",
		"extensions.", "general.autoScroll", "general.smoothScroll", "geo.", "gfx.", "intl.", "layers.", "layout.", "mail.",
		"mailnews.", "media.", "network.", "pdfjs.", "places.", "print.", "signon.", "spellchecker.", "ui.", "widget."}
	for n := range prefs {
		ok := false
		for _, a := range allowed {
			ok = ok || strings.HasPrefix(n, a)
		}
		if !ok {
			t.Errorf("the policy cannot lock %s: its prefix is not one Betterbird accepts", n)
		}
	}

	text := string(repoFile(t, "install/defaults-pref/mesh-defaults.js"))
	sh := parseShipped([]byte(text))
	if !reflect.DeepEqual(sh.values, shippedDefaultsWant) {
		t.Errorf("the defaults are the approved ones:\n got %v\nwant %v", sh.values, shippedDefaultsWant)
	}
	var keeps []string
	for _, n := range sh.order {
		if sh.keeps[n] {
			keeps = append(keeps, n)
		}
	}
	if !reflect.DeepEqual(keeps, shippedKeepsWant) {
		t.Errorf("the preferences kept at Betterbird's default: %v", keeps)
	}
	lines := strings.Split(text, "\n")
	for i, l := range lines {
		if defaultLine.MatchString(l) && (i == 0 || !strings.HasPrefix(lines[i-1], "// ")) {
			t.Errorf("line %d has no comment saying why: %s", i+1, l)
		}
		if t2 := strings.TrimSpace(l); t2 != "" && !strings.HasPrefix(t2, "//") && !defaultLine.MatchString(l) {
			t.Errorf("line %d is neither a comment nor a pref(…) line: %s", i+1, l)
		}
	}
	for n := range sh.values {
		if withheld(n) != "" || passwordSecret.MatchString(n) {
			t.Errorf("%s is an account's or a credential's preference, never a default of the module", n)
		}
		if _, locked := prefs[n]; locked {
			t.Errorf("%s is both locked and a default", n)
		}
	}
}

// T2: Betterbird's own defaults are values read from omni.ja, in Gecko's order, and the module's beside them.
func TestPrefsSayTheDefaultAndTheFileThatGivesIt(t *testing.T) {
	f := newFake(t)
	f.betterbird()
	f.placedByTheMesh()
	f.withDefaults()
	f.betterbirdsOwn()
	links(t, nil)
	got, err := f.Prefs([]string{"offline.autoDetect", "mail.threadpane.listview", "mail.uidensity", "gfx.webrender.software",
		"mailnews.start_page.enabled", "layout.css.always_underline_links", "not.a.default"})
	if err != nil {
		t.Fatal(err)
	}
	by := map[string]Pref{}
	for _, p := range got["prefs"].([]Pref) {
		by[p.Name] = p
	}
	if p := by["offline.autoDetect"]; p.Value != "true" || p.Default != "true" || !strings.Contains(p.DefaultFrom, "all-thunderbird.js") {
		t.Errorf("of two files, the one first by name holds, as Gecko reads them: %+v", p)
	}
	if p := by["mail.threadpane.listview"]; p.Value != "0" || !strings.Contains(p.From, "the module's default") {
		t.Errorf("the module's default is over Betterbird's: %+v", p)
	}
	if p := by["gfx.webrender.software"]; p.Value != "false" || !strings.Contains(p.From, "greprefs.js") {
		t.Errorf("%+v", p)
	}
	if p := by["mailnews.start_page.enabled"]; p.Value != "false" || p.From != "locked by the module's policy" || p.Default != "true" {
		t.Errorf("a locked preference says its lock and Betterbird's default under it: %+v", p)
	}
	if p := by["layout.css.always_underline_links"]; p.Value != "" || !strings.Contains(p.From, "built-in") {
		t.Errorf("a preference in no file is said as such: %+v", p)
	}
	if p := by["not.a.default"]; p.Default != "" {
		t.Errorf("only defaults/pref and greprefs.js are defaults: %+v", p)
	}
}

// T4: of mailnews.* only what names an account, a server or the operator's tags is withheld.
func TestMailnewsIsWithheldOnlyWhereItNamesAnAccount(t *testing.T) {
	for name, held := range map[string]bool{
		"mailnews.start_page.enabled":                        false,
		"mailnews.default_view_flags":                        false,
		"mailnews.message_display.disable_remote_image":      false,
		"mailnews.tags.$label1.tag":                          true,
		"mailnews.smtp.loglevel":                             true,
		"mailnews.reply_to_self_check_all_ident":             true,
		"mailnews.auto_config.fetchFromISP.sendEmailAddress": true,
		"mailnews.oauth.useSchemeRedirect":                   true,
		"mail.server.server1.hostname":                       true,
	} {
		if got := withheld(name) != ""; got != held {
			t.Errorf("%s: withheld %v, want %v", name, got, held)
		}
	}
}

// T1: every managed preference through the layers, and drift where the profile's own value beats the module's
// default without a node layer saying so.
func TestTheConfigShowsTheLayersAndTheDrift(t *testing.T) {
	f := newFake(t)
	f.betterbird()
	f.placedByTheMesh()
	f.withDefaults()
	f.betterbirdsOwn()
	links(t, nil)
	f.declare(`user_pref("mail.uifontsize", 16);`)
	f.write(profileDir+"/prefs.js", "// Mozilla User Preferences\n"+
		`user_pref("extensions.activeThemeID", "thunderbird-compact-dark@mozilla.org");`+"\n"+
		`user_pref("mail.uifontsize", 16);`+"\n"+
		`user_pref("mail.uidensity", 0);`+"\n"+
		`user_pref("mail.biff.show_alert", true);`+"\n"+
		`user_pref("mail.spam.manualMark", false);`+"\n"+
		`user_pref("mailnews.start_page.enabled", true);`+"\n")
	c, err := f.Config(nil)
	if err != nil {
		t.Fatal(err)
	}
	by := map[string]ConfigPref{}
	for _, p := range c.Prefs {
		by[p.Name] = p
	}
	if len(c.Prefs) != 3+len(shippedDefaultsWant)+len(shippedKeepsWant) || !strings.HasPrefix(c.Defaults, "placed") {
		t.Fatalf("every lock, default and kept default: %d, %s", len(c.Prefs), c.Defaults)
	}
	if !reflect.DeepEqual(c.Drifting, []string{"extensions.activeThemeID", "mail.biff.show_alert"}) {
		t.Fatalf("drift: %v", c.Drifting)
	}
	if p := by["mail.biff.show_alert"]; p.Layer != "default" || p.ModuleDefault != "false" || p.BetterbirdDefault != "true" ||
		p.Profile != "true" || p.Effective != "true" || p.From != "the profile's prefs.js" || !strings.Contains(p.Drift, "beats the module's false") {
		t.Errorf("%+v", p)
	}
	if p := by["extensions.activeThemeID"]; p.Layer != "Betterbird's default" || !strings.Contains(p.Drift, `"default-theme@mozilla.org"`) ||
		!strings.Contains(p.Remedy, "add-on manager") || p.Profile != `"thunderbird-compact-dark@mozilla.org"` {
		t.Errorf("another theme is drift whose remedy is the add-on manager, its id answered whole: %+v", p)
	}
	if p := by["mail.spam.manualMark"]; p.Drift != "" || p.BetterbirdDefault != "false" {
		t.Errorf("a saved value equal to Betterbird's default is not drift: %+v", p)
	}
	if p := by["mail.uifontsize"]; p.Drift != "" || p.NodeLayer != "16" {
		t.Errorf("a node layer that says so is not drift: %+v", p)
	}
	if p := by["mailnews.start_page.enabled"]; p.Layer != "locked" || p.Effective != "false" || p.Drift != "" {
		t.Errorf("a lock wins over the profile: %+v", p)
	}
	if p := by["calendar.alarms.showmissed"]; p.Effective != "true" || p.From != "the module's default" {
		t.Errorf("%+v", p)
	}
	// T5: the check says the drift, with both remedies.
	ch, err := f.Check()
	if err != nil {
		t.Fatal(err)
	}
	found := false
	for _, x := range ch.Findings {
		found = found || (strings.Contains(x.What, "1 managed preference(s) drift") && strings.Contains(x.What, "mail.biff.show_alert") &&
			strings.Contains(x.Do, "betterbird_config_apply") && strings.Contains(x.Do, "keep"))
	}
	theme := false
	for _, x := range ch.Findings {
		theme = theme || (strings.HasPrefix(x.What, "extensions.activeThemeID drifts") && strings.Contains(x.Do, "add-on manager") &&
			!strings.Contains(x.Do, "betterbird_config_apply"))
	}
	if !found || !theme {
		t.Fatalf("the check reports the drift: %+v", ch.Findings)
	}
	os.Remove(filepath.Join(f.Root, meshDefaults))
	ch, _ = f.Check()
	found = false
	for _, x := range ch.Findings {
		found = found || strings.Contains(x.What, "the module's defaults are not placed")
	}
	if !found {
		t.Fatalf("defaults missing on a node of the mesh's release is a finding: %+v", ch.Findings)
	}
}

// T3: the drifting values are cleared from prefs.js only while Betterbird is not running, and nothing else.
func TestConfigApplyClearsTheDriftOnlyWhileBetterbirdIsQuit(t *testing.T) {
	f := newFake(t)
	f.betterbird()
	f.placedByTheMesh()
	f.withDefaults()
	f.betterbirdsOwn()
	links(t, nil)
	f.declare("// none")
	prefs := "// Mozilla User Preferences\n" +
		`user_pref("extensions.activeThemeID", "thunderbird-compact-dark@mozilla.org");` + "\n" +
		`user_pref("mail.identity.id1.useremail", "someone@example.org");` + "\n" +
		`user_pref("mail.biff.show_alert", true);` + "\n" +
		`user_pref("mail.uidensity", 0);` + "\n"
	f.write(profileDir+"/prefs.js", prefs)
	dry, err := f.ConfigApply(false)
	if err != nil || dry.Applied || len(dry.Clears) != 1 || len(dry.NotCleared) != 1 {
		t.Fatalf("a dry run lists and changes nothing: %+v %v", dry, err)
	}
	if f.read(profileDir+"/prefs.js") != prefs {
		t.Fatal("a dry run wrote prefs.js")
	}
	if _, err := f.ConfigApply(true); err == nil || !strings.Contains(err.Error(), "running") {
		t.Fatalf("refused while Betterbird runs: %v", err)
	}
	if f.read(profileDir+"/prefs.js") != prefs {
		t.Fatal("prefs.js changed while Betterbird runs")
	}
	stopBetterbird(t, f)
	f.write(profileDir+"/lock", "")
	if _, err := f.ConfigApply(true); err == nil || !strings.Contains(err.Error(), "locked") {
		t.Fatalf("refused while the profile's own lock is there: %v", err)
	}
	if err := os.Remove(filepath.Join(f.Root, profileDir, "lock")); err != nil {
		t.Fatal(err)
	}
	a, err := f.ConfigApply(true)
	if err != nil || !a.Applied {
		t.Fatalf("%+v %v", a, err)
	}
	want := "// Mozilla User Preferences\n" +
		`user_pref("extensions.activeThemeID", "thunderbird-compact-dark@mozilla.org");` + "\n" +
		`user_pref("mail.identity.id1.useremail", "someone@example.org");` + "\n" +
		`user_pref("mail.uidensity", 0);` + "\n"
	if got := f.read(profileDir + "/prefs.js"); got != want {
		t.Fatalf("only the drifting lines go:\n%s", got)
	}
	said := map[string]Cleared{}
	for _, c := range a.Clears {
		said[c.Name] = c
	}
	if c := said["mail.biff.show_alert"]; c.Was != "true" || c.Now != "false" {
		t.Errorf("it says what it cleared and what holds now: %+v", c)
	}
	if _, cleared := said["extensions.activeThemeID"]; cleared || len(a.NotCleared) != 1 || !strings.Contains(a.NotCleared[0], "add-on manager") {
		t.Errorf("the theme is never cleared, and said with its remedy: %+v", a)
	}
	raw, _ := json.Marshal(a)
	if strings.Contains(string(raw), "example.org") {
		t.Fatalf("no account value leaves: %s", raw)
	}
	if c, _ := f.Config(nil); !reflect.DeepEqual(c.Drifting, []string{"extensions.activeThemeID"}) {
		t.Fatalf("once applied, only the theme drifts, until the add-on manager changes it: %v", c.Drifting)
	}
	os.Remove(filepath.Join(f.Root, meshDefaults))
	if _, err := f.ConfigApply(true); err == nil || !strings.Contains(err.Error(), "not placed") {
		t.Fatalf("without the module's defaults there is nothing to come back to: %v", err)
	}
}

// T6: keeping a value on one node is a node layer proposed through the controller, never a write to user.js.
func TestKeepProposesANodeLayerThroughTheController(t *testing.T) {
	f := newFake(t)
	f.betterbird()
	f.placedByTheMesh()
	f.withDefaults()
	links(t, nil)
	f.declare(`user_pref("calendar.alarms.playsound", false); user_pref("mail.uifontsize", 12);`)
	f.write(profileDir+"/prefs.js", `user_pref("mail.uifontsize", 16);`+"\n"+`user_pref("mail.biff.show_alert", true);`+"\n")
	oldNode, oldAsk := nodeName, asker
	t.Cleanup(func() { nodeName, asker = oldNode, oldAsk })
	nodeName = func() string { return "shanks" }
	var verb string
	var args map[string]any
	asker = func(v string, a any) (json.RawMessage, error) {
		verb, args = v, a.(map[string]any)
		return json.RawMessage(`{"ok": true, "output": "proposed: p-1"}`), nil
	}
	before := f.read(testHome + "/.config/betterbird/user.js")
	c, err := f.Config([]string{"mail.uifontsize", "mail.biff.show_alert"})
	if err != nil {
		t.Fatal(err)
	}
	if verb != "seat:mesh-controller.settings" || args["node"] != "shanks" || args["propose"] != "true" || args["module"] != "betterbird" {
		t.Fatalf("%s %v", verb, args)
	}
	var values map[string]string
	if err := json.Unmarshal([]byte(args["values"].(string)), &values); err != nil {
		t.Fatal(err)
	}
	want := `user_pref("calendar.alarms.playsound", false); user_pref("mail.uifontsize", 16); user_pref("mail.biff.show_alert", true);`
	if values["prefs"] != want {
		t.Fatalf("the layer keeps what the setting says and the kept values:\n got %s\nwant %s", values["prefs"], want)
	}
	if c.Proposed != "proposed: p-1" || f.read(testHome+"/.config/betterbird/user.js") != before {
		t.Fatalf("proposed, and user.js untouched: %+v", c)
	}
	for _, bad := range [][]string{{"mailnews.start_page.enabled"}, {"some.other.pref"}, {"mail.uidensity"}} {
		verb = ""
		if _, err := f.Config(bad); err == nil || verb != "" {
			t.Errorf("%v: a lock, an unmanaged name or a value the profile did not save is refused: %v", bad, err)
		}
	}
	nodeName = func() string { return "" }
	if _, err := f.Config([]string{"mail.uifontsize"}); err == nil || !strings.Contains(err.Error(), "MESH_NODE") {
		t.Fatalf("%v", err)
	}
}

// The review of pull request 253: whether Betterbird asks to be the default client is decided from the policy's
// own Preferences entry, never from what else the policy lacks.
func TestTheDefaultClientAskIsDecidedFromThePreferencesEntry(t *testing.T) {
	f := newFake(t)
	f.betterbird()
	f.placedByTheMesh()
	links(t, nil)
	f.write(policyFile, `{"policies": {"ExtensionSettings": {}}}`)
	if why := f.defaultClientAsk(filepath.Join(f.Root, profileDir)); why == "" {
		t.Fatal("a policy lacking the updater and the lock still asks")
	}
	f.write(policyFile, `{"policies": {"Preferences": {"mail.shell.checkDefaultClient": {"Value": false, "Status": "locked"}}}}`)
	if why := f.defaultClientAsk(filepath.Join(f.Root, profileDir)); why != "" {
		t.Fatalf("the lock holds whatever else the policy lacks: %s", why)
	}
}

// The review of pull request 256: the theme is the add-on database's, and a saved default is not drift.
func TestTheThemeIsTheAddOnDatabasesAndASavedDefaultIsNotDrift(t *testing.T) {
	f := newFake(t)
	f.betterbird()
	f.placedByTheMesh()
	f.withDefaults()
	links(t, nil)
	f.write(profileDir+"/prefs.js", `user_pref("browser.display.use_system_colors", false);`+"\n"+
		`user_pref("layout.css.always_underline_links", false);`+"\n")
	f.write(profileDir+"/extensions.json", `{"addons":[{"id":"thunderbird-compact-dark@mozilla.org","type":"theme","active":true,"location":"app-builtin"},`+
		`{"id":"default-theme@mozilla.org","type":"theme","active":false,"location":"app-builtin"}]}`)
	c, err := f.Config(nil)
	if err != nil {
		t.Fatal(err)
	}
	if !reflect.DeepEqual(c.Drifting, []string{"extensions.activeThemeID"}) {
		t.Fatalf("the active theme from the add-on database, with no preference saved, is drift; a saved default is not: %v", c.Drifting)
	}
	f.write(profileDir+"/prefs.js", `user_pref("extensions.activeThemeID", "default-theme@mozilla.org");`+"\n")
	f.write(profileDir+"/extensions.json", `{"addons":[{"id":"default-theme@mozilla.org","type":"theme","active":true,"location":"app-builtin"}]}`)
	if c, _ := f.Config(nil); len(c.Drifting) != 0 {
		t.Fatalf("a profile back on the default theme does not drift: %v", c.Drifting)
	}
	if _, err := f.Config([]string{"extensions.activeThemeID"}); err == nil || !strings.Contains(err.Error(), "add-on manager") {
		t.Fatalf("a node layer cannot choose the theme: %v", err)
	}
}

// The review of pull request 256: a credential's or an account's name in the defaults file is never managed.
func TestAnAccountsNameInTheDefaultsIsNeverManaged(t *testing.T) {
	f := newFake(t)
	f.betterbird()
	f.placedByTheMesh()
	links(t, nil)
	f.write(meshDefaults, string(repoFile(t, "install/defaults-pref/mesh-defaults.js"))+
		`pref("mail.identity.id1.useremail", "x");`+"\n"+"// keeps Betterbird's default: mail.server.server1.hostname\n"+
		`pref("mail.smtpservers", "");`+"\n")
	prefs := `user_pref("mail.identity.id1.useremail", "someone@example.org");` + "\n" +
		`user_pref("mail.server.server1.hostname", "imap.example.org");` + "\n" +
		`user_pref("mail.smtpservers", "smtp1");` + "\n"
	f.write(profileDir+"/prefs.js", prefs)
	c, err := f.Config(nil)
	if err != nil {
		t.Fatal(err)
	}
	if len(c.Refused) != 3 || len(c.Drifting) != 0 {
		t.Fatalf("refused, never managed: %+v", c)
	}
	raw, _ := json.Marshal(c)
	if strings.Contains(string(raw), "example.org") {
		t.Fatalf("no account value is answered: %s", raw)
	}
	stopBetterbird(t, f)
	if _, err := f.ConfigApply(true); err != nil {
		t.Fatal(err)
	}
	if f.read(profileDir+"/prefs.js") != prefs {
		t.Fatal("prefs.js keeps every account's value")
	}
	ch, _ := f.Check()
	found := false
	for _, x := range ch.Findings {
		found = found || (strings.Contains(x.What, "3 preference(s) the tools never manage") && strings.Contains(x.Do, "mesh-defaults.js"))
	}
	if !found {
		t.Fatalf("the check says so: %+v", ch.Findings)
	}
}