hakurei/container/dispatcher_test.go
Ophestra e9fb1d7be5
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container/initdaemon: copy wstatus from wait4 loop
Due to the special nature of the init process, direct use of wait outside the wait4 loop is racy. This change copies the wstatus from wait4 loop state instead.

Signed-off-by: Ophestra <cat@gensokyo.uk>
2025-12-08 22:58:42 +09:00

795 lines
20 KiB
Go

package container
import (
"bytes"
"fmt"
"io"
"io/fs"
"log"
"os"
"os/exec"
"reflect"
"runtime"
"slices"
"strings"
"syscall"
"testing"
"time"
"hakurei.app/container/seccomp"
"hakurei.app/container/std"
"hakurei.app/container/stub"
"hakurei.app/message"
)
type opValidTestCase struct {
name string
op Op
want bool
}
func checkOpsValid(t *testing.T, testCases []opValidTestCase) {
t.Helper()
t.Run("valid", func(t *testing.T) {
t.Helper()
t.Parallel()
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
t.Helper()
t.Parallel()
if got := tc.op.Valid(); got != tc.want {
t.Errorf("Valid: %v, want %v", got, tc.want)
}
})
}
})
}
type opsBuilderTestCase struct {
name string
ops *Ops
want Ops
}
func checkOpsBuilder(t *testing.T, testCases []opsBuilderTestCase) {
t.Helper()
t.Run("build", func(t *testing.T) {
t.Helper()
t.Parallel()
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
t.Helper()
t.Parallel()
if !slices.EqualFunc(*tc.ops, tc.want, func(op Op, v Op) bool { return op.Is(v) }) {
t.Errorf("Ops: %#v, want %#v", tc.ops, tc.want)
}
})
}
})
}
type opIsTestCase struct {
name string
op, v Op
want bool
}
func checkOpIs(t *testing.T, testCases []opIsTestCase) {
t.Helper()
t.Run("is", func(t *testing.T) {
t.Helper()
t.Parallel()
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
t.Helper()
t.Parallel()
if got := tc.op.Is(tc.v); got != tc.want {
t.Errorf("Is: %v, want %v", got, tc.want)
}
})
}
})
}
type opMetaTestCase struct {
name string
op Op
wantPrefix string
wantString string
}
func checkOpMeta(t *testing.T, testCases []opMetaTestCase) {
t.Helper()
t.Run("meta", func(t *testing.T) {
t.Helper()
t.Parallel()
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
t.Helper()
t.Parallel()
t.Run("prefix", func(t *testing.T) {
t.Helper()
if got, _ := tc.op.prefix(); got != tc.wantPrefix {
t.Errorf("prefix: %q, want %q", got, tc.wantPrefix)
}
})
t.Run("string", func(t *testing.T) {
t.Helper()
if got := tc.op.String(); got != tc.wantString {
t.Errorf("String: %s, want %s", got, tc.wantString)
}
})
})
}
})
}
// call initialises a [stub.Call].
// This keeps composites analysis happy without making the test cases too bloated.
func call(name string, args stub.ExpectArgs, ret any, err error) stub.Call {
return stub.Call{Name: name, Args: args, Ret: ret, Err: err}
}
type simpleTestCase struct {
name string
f func(k *kstub) error
want stub.Expect
wantErr error
}
func checkSimple(t *testing.T, fname string, testCases []simpleTestCase) {
t.Helper()
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
t.Helper()
t.Parallel()
wait4signal := make(chan struct{})
k := &kstub{wait4signal, stub.New(t, func(s *stub.Stub[syscallDispatcher]) syscallDispatcher { return &kstub{wait4signal, s} }, tc.want)}
defer stub.HandleExit(t)
if err := tc.f(k); !reflect.DeepEqual(err, tc.wantErr) {
t.Errorf("%s: error = %v, want %v", fname, err, tc.wantErr)
}
k.VisitIncomplete(func(s *stub.Stub[syscallDispatcher]) {
t.Helper()
t.Errorf("%s: %d calls, want %d", fname, s.Pos(), s.Len())
})
})
}
}
type opBehaviourTestCase struct {
name string
params *Params
op Op
early []stub.Call
wantErrEarly error
apply []stub.Call
wantErrApply error
}
func checkOpBehaviour(t *testing.T, testCases []opBehaviourTestCase) {
t.Helper()
t.Run("behaviour", func(t *testing.T) {
t.Helper()
t.Parallel()
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
t.Helper()
t.Parallel()
k := &kstub{nil, stub.New(t,
func(s *stub.Stub[syscallDispatcher]) syscallDispatcher { return &kstub{nil, s} },
stub.Expect{Calls: slices.Concat(tc.early, []stub.Call{{Name: stub.CallSeparator}}, tc.apply)},
)}
state := &setupState{Params: tc.params, Msg: k}
defer stub.HandleExit(t)
errEarly := tc.op.early(state, k)
k.Expects(stub.CallSeparator)
if !reflect.DeepEqual(errEarly, tc.wantErrEarly) {
t.Errorf("early: error = %v, want %v", errEarly, tc.wantErrEarly)
}
if errEarly != nil {
goto out
}
if err := tc.op.apply(state, k); !reflect.DeepEqual(err, tc.wantErrApply) {
t.Errorf("apply: error = %v, want %v", err, tc.wantErrApply)
}
out:
k.VisitIncomplete(func(s *stub.Stub[syscallDispatcher]) {
count := k.Pos() - 1 // separator
if count < len(tc.early) {
t.Errorf("early: %d calls, want %d", count, len(tc.early))
} else {
t.Errorf("apply: %d calls, want %d", count-len(tc.early), len(tc.apply))
}
})
})
}
})
}
func sliceAddr[S any](s []S) *[]S { return &s }
func newCheckedFile(t *testing.T, name, wantData string, closeErr error) osFile {
f := &checkedOsFile{t: t, name: name, want: wantData, closeErr: closeErr}
// check happens in Close, and cleanup is not guaranteed to run, so relying on it for sloppy implementations will cause sporadic test results
f.cleanup = runtime.AddCleanup(f, func(name string) { f.t.Fatalf("checkedOsFile %s became unreachable without a call to Close", name) }, f.name)
return f
}
type checkedOsFile struct {
t *testing.T
name string
want string
closeErr error
cleanup runtime.Cleanup
bytes.Buffer
}
func (f *checkedOsFile) Name() string { return f.name }
func (f *checkedOsFile) Stat() (fs.FileInfo, error) { panic("unreachable") }
func (f *checkedOsFile) Close() error {
defer f.cleanup.Stop()
if f.String() != f.want {
f.t.Errorf("checkedOsFile:\n%s\nwant\n%s", f.String(), f.want)
return syscall.ENOTRECOVERABLE
}
return f.closeErr
}
func newConstFile(s string) osFile { return &readerOsFile{Reader: strings.NewReader(s)} }
type readerOsFile struct {
closed bool
io.Reader
}
func (*readerOsFile) Name() string { panic("unreachable") }
func (*readerOsFile) Write([]byte) (int, error) { panic("unreachable") }
func (*readerOsFile) Stat() (fs.FileInfo, error) { panic("unreachable") }
func (r *readerOsFile) Close() error {
if r.closed {
return os.ErrClosed
}
r.closed = true
return nil
}
type writeErrOsFile struct{ err error }
func (writeErrOsFile) Name() string { panic("unreachable") }
func (f writeErrOsFile) Write([]byte) (int, error) { return 0, f.err }
func (writeErrOsFile) Stat() (fs.FileInfo, error) { panic("unreachable") }
func (writeErrOsFile) Read([]byte) (int, error) { panic("unreachable") }
func (writeErrOsFile) Close() error { panic("unreachable") }
type isDirFi bool
func (isDirFi) Name() string { panic("unreachable") }
func (isDirFi) Size() int64 { panic("unreachable") }
func (isDirFi) Mode() fs.FileMode { panic("unreachable") }
func (isDirFi) ModTime() time.Time { panic("unreachable") }
func (fi isDirFi) IsDir() bool { return bool(fi) }
func (isDirFi) Sys() any { panic("unreachable") }
func stubDir(names ...string) []os.DirEntry {
d := make([]os.DirEntry, len(names))
for i, name := range names {
d[i] = nameDentry(name)
}
return d
}
type nameDentry string
func (e nameDentry) Name() string { return string(e) }
func (nameDentry) IsDir() bool { panic("unreachable") }
func (nameDentry) Type() fs.FileMode { panic("unreachable") }
func (nameDentry) Info() (fs.FileInfo, error) { panic("unreachable") }
const (
// magicWait4Signal must be used in a single pair of signal and wait4 calls across two goroutines
// originating from the same toplevel kstub.
// To enable this behaviour this value must be the last element of the args field in the wait4 call
// and the ret value of the signal call.
magicWait4Signal = 0xdef
)
type kstub struct {
wait4signal chan struct{}
*stub.Stub[syscallDispatcher]
}
func (k *kstub) new(f func(k syscallDispatcher)) { k.Helper(); k.New(f) }
func (k *kstub) lockOSThread() { k.Helper(); k.Expects("lockOSThread") }
func (k *kstub) setPtracer(pid uintptr) error {
k.Helper()
return k.Expects("setPtracer").Error(
stub.CheckArg(k.Stub, "pid", pid, 0))
}
func (k *kstub) setDumpable(dumpable uintptr) error {
k.Helper()
return k.Expects("setDumpable").Error(
stub.CheckArg(k.Stub, "dumpable", dumpable, 0))
}
func (k *kstub) setNoNewPrivs() error { k.Helper(); return k.Expects("setNoNewPrivs").Err }
func (k *kstub) lastcap(msg message.Msg) uintptr {
k.Helper()
k.checkMsg(msg)
return k.Expects("lastcap").Ret.(uintptr)
}
func (k *kstub) capset(hdrp *capHeader, datap *[2]capData) error {
k.Helper()
return k.Expects("capset").Error(
stub.CheckArgReflect(k.Stub, "hdrp", hdrp, 0),
stub.CheckArgReflect(k.Stub, "datap", datap, 1))
}
func (k *kstub) capBoundingSetDrop(cap uintptr) error {
k.Helper()
return k.Expects("capBoundingSetDrop").Error(
stub.CheckArg(k.Stub, "cap", cap, 0))
}
func (k *kstub) capAmbientClearAll() error { k.Helper(); return k.Expects("capAmbientClearAll").Err }
func (k *kstub) capAmbientRaise(cap uintptr) error {
k.Helper()
return k.Expects("capAmbientRaise").Error(
stub.CheckArg(k.Stub, "cap", cap, 0))
}
func (k *kstub) isatty(fd int) bool {
k.Helper()
expect := k.Expects("isatty")
if !stub.CheckArg(k.Stub, "fd", fd, 0) {
k.FailNow()
}
return expect.Ret.(bool)
}
func (k *kstub) receive(key string, e any, fdp *uintptr) (closeFunc func() error, err error) {
k.Helper()
expect := k.Expects("receive")
var closed bool
closeFunc = func() error {
if closed {
k.Error("closeFunc called more than once")
return os.ErrClosed
}
closed = true
if expect.Ret != nil {
// use return stored in kexpect for closeFunc instead
return expect.Ret.(error)
}
return nil
}
err = expect.Error(
stub.CheckArg(k.Stub, "key", key, 0),
stub.CheckArgReflect(k.Stub, "e", e, 1),
stub.CheckArgReflect(k.Stub, "fdp", fdp, 2))
// 3 is unused so stores params
if expect.Args[3] != nil {
if v, ok := expect.Args[3].(*initParams); ok && v != nil {
if p, ok0 := e.(*initParams); ok0 && p != nil {
*p = *v
}
}
}
// 4 is unused so stores fd
if expect.Args[4] != nil {
if v, ok := expect.Args[4].(uintptr); ok && v >= 3 {
if fdp != nil {
*fdp = v
}
}
}
return
}
func (k *kstub) bindMount(msg message.Msg, source, target string, flags uintptr) error {
k.Helper()
k.checkMsg(msg)
return k.Expects("bindMount").Error(
stub.CheckArg(k.Stub, "source", source, 0),
stub.CheckArg(k.Stub, "target", target, 1),
stub.CheckArg(k.Stub, "flags", flags, 2))
}
func (k *kstub) remount(msg message.Msg, target string, flags uintptr) error {
k.Helper()
k.checkMsg(msg)
return k.Expects("remount").Error(
stub.CheckArg(k.Stub, "target", target, 0),
stub.CheckArg(k.Stub, "flags", flags, 1))
}
func (k *kstub) mountTmpfs(fsname, target string, flags uintptr, size int, perm os.FileMode) error {
k.Helper()
return k.Expects("mountTmpfs").Error(
stub.CheckArg(k.Stub, "fsname", fsname, 0),
stub.CheckArg(k.Stub, "target", target, 1),
stub.CheckArg(k.Stub, "flags", flags, 2),
stub.CheckArg(k.Stub, "size", size, 3),
stub.CheckArg(k.Stub, "perm", perm, 4))
}
func (k *kstub) ensureFile(name string, perm, pperm os.FileMode) error {
k.Helper()
return k.Expects("ensureFile").Error(
stub.CheckArg(k.Stub, "name", name, 0),
stub.CheckArg(k.Stub, "perm", perm, 1),
stub.CheckArg(k.Stub, "pperm", pperm, 2))
}
func (k *kstub) seccompLoad(rules []std.NativeRule, flags seccomp.ExportFlag) error {
k.Helper()
return k.Expects("seccompLoad").Error(
stub.CheckArgReflect(k.Stub, "rules", rules, 0),
stub.CheckArg(k.Stub, "flags", flags, 1))
}
func (k *kstub) notify(c chan<- os.Signal, sig ...os.Signal) {
k.Helper()
expect := k.Expects("notify")
if c == nil || expect.Error(
stub.CheckArgReflect(k.Stub, "sig", sig, 1)) != nil {
k.FailNow()
}
// export channel for external instrumentation
if chanf, ok := expect.Args[0].(func(c chan<- os.Signal)); ok && chanf != nil {
chanf(c)
}
}
func (k *kstub) start(c *exec.Cmd) error {
k.Helper()
expect := k.Expects("start")
err := expect.Error(
stub.CheckArg(k.Stub, "c.Path", c.Path, 0),
stub.CheckArgReflect(k.Stub, "c.Args", c.Args, 1),
stub.CheckArgReflect(k.Stub, "c.Env", c.Env, 2),
stub.CheckArg(k.Stub, "c.Dir", c.Dir, 3))
if process, ok := expect.Ret.(*os.Process); ok && process != nil {
c.Process = process
}
return err
}
func (k *kstub) signal(c *exec.Cmd, sig os.Signal) error {
k.Helper()
expect := k.Expects("signal")
if v, ok := expect.Ret.(int); ok && v == magicWait4Signal {
if k.wait4signal == nil {
panic("kstub not initialised for wait4 simulation")
}
defer func() { close(k.wait4signal) }()
}
return expect.Error(
stub.CheckArg(k.Stub, "c.Path", c.Path, 0),
stub.CheckArgReflect(k.Stub, "c.Args", c.Args, 1),
stub.CheckArgReflect(k.Stub, "c.Env", c.Env, 2),
stub.CheckArg(k.Stub, "c.Dir", c.Dir, 3),
stub.CheckArg(k.Stub, "sig", sig, 4))
}
func (k *kstub) evalSymlinks(path string) (string, error) {
k.Helper()
expect := k.Expects("evalSymlinks")
return expect.Ret.(string), expect.Error(
stub.CheckArg(k.Stub, "path", path, 0))
}
func (k *kstub) exit(code int) {
k.Helper()
k.Expects("exit")
if !stub.CheckArg(k.Stub, "code", code, 0) {
k.FailNow()
}
panic(stub.PanicExit)
}
func (k *kstub) getpid() int { k.Helper(); return k.Expects("getpid").Ret.(int) }
func (k *kstub) stat(name string) (os.FileInfo, error) {
k.Helper()
expect := k.Expects("stat")
return expect.Ret.(os.FileInfo), expect.Error(
stub.CheckArg(k.Stub, "name", name, 0))
}
func (k *kstub) mkdir(name string, perm os.FileMode) error {
k.Helper()
return k.Expects("mkdir").Error(
stub.CheckArg(k.Stub, "name", name, 0),
stub.CheckArg(k.Stub, "perm", perm, 1))
}
func (k *kstub) mkdirTemp(dir, pattern string) (string, error) {
k.Helper()
expect := k.Expects("mkdirTemp")
return expect.Ret.(string), expect.Error(
stub.CheckArg(k.Stub, "dir", dir, 0),
stub.CheckArg(k.Stub, "pattern", pattern, 1))
}
func (k *kstub) mkdirAll(path string, perm os.FileMode) error {
k.Helper()
return k.Expects("mkdirAll").Error(
stub.CheckArg(k.Stub, "path", path, 0),
stub.CheckArg(k.Stub, "perm", perm, 1))
}
func (k *kstub) readdir(name string) ([]os.DirEntry, error) {
k.Helper()
expect := k.Expects("readdir")
return expect.Ret.([]os.DirEntry), expect.Error(
stub.CheckArg(k.Stub, "name", name, 0))
}
func (k *kstub) openNew(name string) (osFile, error) {
k.Helper()
expect := k.Expects("openNew")
return expect.Ret.(osFile), expect.Error(
stub.CheckArg(k.Stub, "name", name, 0))
}
func (k *kstub) writeFile(name string, data []byte, perm os.FileMode) error {
k.Helper()
return k.Expects("writeFile").Error(
stub.CheckArg(k.Stub, "name", name, 0),
stub.CheckArgReflect(k.Stub, "data", data, 1),
stub.CheckArg(k.Stub, "perm", perm, 2))
}
func (k *kstub) createTemp(dir, pattern string) (osFile, error) {
k.Helper()
expect := k.Expects("createTemp")
return expect.Ret.(osFile), expect.Error(
stub.CheckArg(k.Stub, "dir", dir, 0),
stub.CheckArg(k.Stub, "pattern", pattern, 1))
}
func (k *kstub) remove(name string) error {
k.Helper()
return k.Expects("remove").Error(
stub.CheckArg(k.Stub, "name", name, 0))
}
func (k *kstub) newFile(fd uintptr, name string) *os.File {
k.Helper()
expect := k.Expects("newFile")
if expect.Error(
stub.CheckArg(k.Stub, "fd", fd, 0),
stub.CheckArg(k.Stub, "name", name, 1)) != nil {
k.FailNow()
}
return expect.Ret.(*os.File)
}
func (k *kstub) symlink(oldname, newname string) error {
k.Helper()
return k.Expects("symlink").Error(
stub.CheckArg(k.Stub, "oldname", oldname, 0),
stub.CheckArg(k.Stub, "newname", newname, 1))
}
func (k *kstub) readlink(name string) (string, error) {
k.Helper()
expect := k.Expects("readlink")
return expect.Ret.(string), expect.Error(
stub.CheckArg(k.Stub, "name", name, 0))
}
func (k *kstub) umask(mask int) (oldmask int) {
k.Helper()
expect := k.Expects("umask")
if !stub.CheckArg(k.Stub, "mask", mask, 0) {
k.FailNow()
}
return expect.Ret.(int)
}
func (k *kstub) sethostname(p []byte) (err error) {
k.Helper()
return k.Expects("sethostname").Error(
stub.CheckArgReflect(k.Stub, "p", p, 0))
}
func (k *kstub) chdir(path string) (err error) {
k.Helper()
return k.Expects("chdir").Error(
stub.CheckArg(k.Stub, "path", path, 0))
}
func (k *kstub) fchdir(fd int) (err error) {
k.Helper()
return k.Expects("fchdir").Error(
stub.CheckArg(k.Stub, "fd", fd, 0))
}
func (k *kstub) open(path string, mode int, perm uint32) (fd int, err error) {
k.Helper()
expect := k.Expects("open")
return expect.Ret.(int), expect.Error(
stub.CheckArg(k.Stub, "path", path, 0),
stub.CheckArg(k.Stub, "mode", mode, 1),
stub.CheckArg(k.Stub, "perm", perm, 2))
}
func (k *kstub) close(fd int) (err error) {
k.Helper()
return k.Expects("close").Error(
stub.CheckArg(k.Stub, "fd", fd, 0))
}
func (k *kstub) pivotRoot(newroot, putold string) (err error) {
k.Helper()
return k.Expects("pivotRoot").Error(
stub.CheckArg(k.Stub, "newroot", newroot, 0),
stub.CheckArg(k.Stub, "putold", putold, 1))
}
func (k *kstub) mount(source, target, fstype string, flags uintptr, data string) (err error) {
k.Helper()
return k.Expects("mount").Error(
stub.CheckArg(k.Stub, "source", source, 0),
stub.CheckArg(k.Stub, "target", target, 1),
stub.CheckArg(k.Stub, "fstype", fstype, 2),
stub.CheckArg(k.Stub, "flags", flags, 3),
stub.CheckArg(k.Stub, "data", data, 4))
}
func (k *kstub) unmount(target string, flags int) (err error) {
k.Helper()
return k.Expects("unmount").Error(
stub.CheckArg(k.Stub, "target", target, 0),
stub.CheckArg(k.Stub, "flags", flags, 1))
}
func (k *kstub) wait4(pid int, wstatus *syscall.WaitStatus, options int, rusage *syscall.Rusage) (wpid int, err error) {
k.Helper()
expect := k.Expects("wait4")
if v, ok := expect.Args[4].(int); ok {
switch v {
case stub.PanicExit: // special case to prevent leaking the wait4 goroutine while testing initEntrypoint
panic(stub.PanicExit)
case magicWait4Signal: // block until corresponding signal call
if k.wait4signal == nil {
panic("kstub not initialised for wait4 simulation")
}
<-k.wait4signal
}
}
wpid = expect.Ret.(int)
err = expect.Error(
stub.CheckArg(k.Stub, "pid", pid, 0),
stub.CheckArg(k.Stub, "options", options, 2))
if wstatusV, ok := expect.Args[1].(syscall.WaitStatus); wstatus != nil && ok {
*wstatus = wstatusV
}
if rusageV, ok := expect.Args[3].(syscall.Rusage); rusage != nil && ok {
*rusage = rusageV
}
return
}
func (k *kstub) printf(_ message.Msg, format string, v ...any) {
k.Helper()
if k.Expects("printf").Error(
stub.CheckArg(k.Stub, "format", format, 0),
stub.CheckArgReflect(k.Stub, "v", v, 1)) != nil {
k.FailNow()
}
}
func (k *kstub) fatal(_ message.Msg, v ...any) {
k.Helper()
if k.Expects("fatal").Error(
stub.CheckArgReflect(k.Stub, "v", v, 0)) != nil {
k.FailNow()
}
panic(stub.PanicExit)
}
func (k *kstub) fatalf(_ message.Msg, format string, v ...any) {
k.Helper()
if k.Expects("fatalf").Error(
stub.CheckArg(k.Stub, "format", format, 0),
stub.CheckArgReflect(k.Stub, "v", v, 1)) != nil {
k.FailNow()
}
panic(stub.PanicExit)
}
func (k *kstub) checkMsg(msg message.Msg) {
k.Helper()
var target *kstub
if state, ok := msg.(*setupState); ok {
target = state.Msg.(*kstub)
} else {
target = msg.(*kstub)
}
if k != target {
panic(fmt.Sprintf("unexpected Msg: %#v", msg))
}
}
func (k *kstub) GetLogger() *log.Logger { panic("unreachable") }
func (k *kstub) IsVerbose() bool { k.Helper(); return k.Expects("isVerbose").Ret.(bool) }
func (k *kstub) SwapVerbose(verbose bool) bool {
k.Helper()
expect := k.Expects("swapVerbose")
if expect.Error(
stub.CheckArg(k.Stub, "verbose", verbose, 0)) != nil {
k.FailNow()
}
return expect.Ret.(bool)
}
func (k *kstub) Verbose(v ...any) {
k.Helper()
if k.Expects("verbose").Error(
stub.CheckArgReflect(k.Stub, "v", v, 0)) != nil {
k.FailNow()
}
}
func (k *kstub) Verbosef(format string, v ...any) {
k.Helper()
if k.Expects("verbosef").Error(
stub.CheckArg(k.Stub, "format", format, 0),
stub.CheckArgReflect(k.Stub, "v", v, 1)) != nil {
k.FailNow()
}
}
func (k *kstub) Suspend() bool { k.Helper(); return k.Expects("suspend").Ret.(bool) }
func (k *kstub) Resume() bool { k.Helper(); return k.Expects("resume").Ret.(bool) }
func (k *kstub) BeforeExit() { k.Helper(); k.Expects("beforeExit") }