diff --git a/samples/hellofs/hello_fs_test.go b/samples/hellofs/hello_fs_test.go
index c0daa89..ab5eb66 100644
--- a/samples/hellofs/hello_fs_test.go
+++ b/samples/hellofs/hello_fs_test.go
@@ -17,20 +17,16 @@ package hellofs_test
 import (
 	"io"
 	"io/ioutil"
-	"log"
 	"os"
 	"path"
-	"strings"
 	"syscall"
 	"testing"
-	"time"
 
 	"github.com/jacobsa/fuse"
+	"github.com/jacobsa/fuse/samples"
 	"github.com/jacobsa/fuse/samples/hellofs"
-	"github.com/googlecloudplatform/gcsfuse/timeutil"
 	. "github.com/jacobsa/oglematchers"
 	. "github.com/jacobsa/ogletest"
-	"golang.org/x/net/context"
 )
 
 func TestHelloFS(t *testing.T) { RunTests(t) }
@@ -40,8 +36,7 @@ func TestHelloFS(t *testing.T) { RunTests(t) }
 ////////////////////////////////////////////////////////////////////////
 
 type HelloFSTest struct {
-	clock timeutil.SimulatedClock
-	mfs   *fuse.MountedFileSystem
+	samples.SampleTest
 }
 
 var _ SetUpInterface = &HelloFSTest{}
@@ -50,53 +45,15 @@ var _ TearDownInterface = &HelloFSTest{}
 func init() { RegisterTestSuite(&HelloFSTest{}) }
 
 func (t *HelloFSTest) SetUp(ti *TestInfo) {
-	var err error
-
-	// Set up a fixed, non-zero time.
-	t.clock.SetTime(time.Now())
-
-	// Set up a temporary directory for mounting.
-	mountPoint, err := ioutil.TempDir("", "hello_fs_test")
-	if err != nil {
-		panic("ioutil.TempDir: " + err.Error())
-	}
-
-	// Mount a file system.
 	fs := &hellofs.HelloFS{
-		Clock: &t.clock,
+		Clock: &t.Clock,
 	}
 
-	if t.mfs, err = fuse.Mount(mountPoint, fs, &fuse.MountConfig{}); err != nil {
-		panic("Mount: " + err.Error())
-	}
-
-	if err = t.mfs.WaitForReady(context.Background()); err != nil {
-		panic("MountedFileSystem.WaitForReady: " + err.Error())
-	}
+	t.SampleTest.Initialize(fs, &fuse.MountConfig{})
 }
 
 func (t *HelloFSTest) TearDown() {
-	// Unmount the file system. Try again on "resource busy" errors.
-	delay := 10 * time.Millisecond
-	for {
-		err := t.mfs.Unmount()
-		if err == nil {
-			break
-		}
-
-		if strings.Contains(err.Error(), "resource busy") {
-			log.Println("Resource busy error while unmounting; trying again")
-			time.Sleep(delay)
-			delay = time.Duration(1.3 * float64(delay))
-			continue
-		}
-
-		panic("MountedFileSystem.Unmount: " + err.Error())
-	}
-
-	if err := t.mfs.Join(context.Background()); err != nil {
-		panic("MountedFileSystem.Join: " + err.Error())
-	}
+	t.SampleTest.Destroy()
 }
 
 ////////////////////////////////////////////////////////////////////////
@@ -104,7 +61,7 @@ func (t *HelloFSTest) TearDown() {
 ////////////////////////////////////////////////////////////////////////
 
 func (t *HelloFSTest) ReadDir_Root() {
-	entries, err := ioutil.ReadDir(t.mfs.Dir())
+	entries, err := ioutil.ReadDir(t.Dir)
 
 	AssertEq(nil, err)
 	AssertEq(2, len(entries))
@@ -115,7 +72,7 @@ func (t *HelloFSTest) ReadDir_Root() {
 	ExpectEq("dir", fi.Name())
 	ExpectEq(0, fi.Size())
 	ExpectEq(os.ModeDir|0555, fi.Mode())
-	ExpectEq(0, t.clock.Now().Sub(fi.ModTime()), "ModTime: %v", fi.ModTime())
+	ExpectEq(0, t.Clock.Now().Sub(fi.ModTime()), "ModTime: %v", fi.ModTime())
 	ExpectTrue(fi.IsDir())
 
 	// hello
@@ -123,12 +80,12 @@ func (t *HelloFSTest) ReadDir_Root() {
 	ExpectEq("hello", fi.Name())
 	ExpectEq(len("Hello, world!"), fi.Size())
 	ExpectEq(0444, fi.Mode())
-	ExpectEq(0, t.clock.Now().Sub(fi.ModTime()), "ModTime: %v", fi.ModTime())
+	ExpectEq(0, t.Clock.Now().Sub(fi.ModTime()), "ModTime: %v", fi.ModTime())
 	ExpectFalse(fi.IsDir())
 }
 
 func (t *HelloFSTest) ReadDir_Dir() {
-	entries, err := ioutil.ReadDir(path.Join(t.mfs.Dir(), "dir"))
+	entries, err := ioutil.ReadDir(path.Join(t.Dir, "dir"))
 
 	AssertEq(nil, err)
 	AssertEq(1, len(entries))
@@ -139,76 +96,76 @@ func (t *HelloFSTest) ReadDir_Dir() {
 	ExpectEq("world", fi.Name())
 	ExpectEq(len("Hello, world!"), fi.Size())
 	ExpectEq(0444, fi.Mode())
-	ExpectEq(0, t.clock.Now().Sub(fi.ModTime()), "ModTime: %v", fi.ModTime())
+	ExpectEq(0, t.Clock.Now().Sub(fi.ModTime()), "ModTime: %v", fi.ModTime())
 	ExpectFalse(fi.IsDir())
 }
 
 func (t *HelloFSTest) ReadDir_NonExistent() {
-	_, err := ioutil.ReadDir(path.Join(t.mfs.Dir(), "foobar"))
+	_, err := ioutil.ReadDir(path.Join(t.Dir, "foobar"))
 
 	AssertNe(nil, err)
 	ExpectThat(err, Error(HasSubstr("no such file")))
 }
 
 func (t *HelloFSTest) Stat_Hello() {
-	fi, err := os.Stat(path.Join(t.mfs.Dir(), "hello"))
+	fi, err := os.Stat(path.Join(t.Dir, "hello"))
 	AssertEq(nil, err)
 
 	ExpectEq("hello", fi.Name())
 	ExpectEq(len("Hello, world!"), fi.Size())
 	ExpectEq(0444, fi.Mode())
-	ExpectEq(0, t.clock.Now().Sub(fi.ModTime()), "ModTime: %v", fi.ModTime())
+	ExpectEq(0, t.Clock.Now().Sub(fi.ModTime()), "ModTime: %v", fi.ModTime())
 	ExpectFalse(fi.IsDir())
 	ExpectEq(1, fi.Sys().(*syscall.Stat_t).Nlink)
 }
 
 func (t *HelloFSTest) Stat_Dir() {
-	fi, err := os.Stat(path.Join(t.mfs.Dir(), "dir"))
+	fi, err := os.Stat(path.Join(t.Dir, "dir"))
 	AssertEq(nil, err)
 
 	ExpectEq("dir", fi.Name())
 	ExpectEq(0, fi.Size())
 	ExpectEq(0555|os.ModeDir, fi.Mode())
-	ExpectEq(0, t.clock.Now().Sub(fi.ModTime()), "ModTime: %v", fi.ModTime())
+	ExpectEq(0, t.Clock.Now().Sub(fi.ModTime()), "ModTime: %v", fi.ModTime())
 	ExpectTrue(fi.IsDir())
 	ExpectEq(1, fi.Sys().(*syscall.Stat_t).Nlink)
 }
 
 func (t *HelloFSTest) Stat_World() {
-	fi, err := os.Stat(path.Join(t.mfs.Dir(), "dir/world"))
+	fi, err := os.Stat(path.Join(t.Dir, "dir/world"))
 	AssertEq(nil, err)
 
 	ExpectEq("world", fi.Name())
 	ExpectEq(len("Hello, world!"), fi.Size())
 	ExpectEq(0444, fi.Mode())
-	ExpectEq(0, t.clock.Now().Sub(fi.ModTime()), "ModTime: %v", fi.ModTime())
+	ExpectEq(0, t.Clock.Now().Sub(fi.ModTime()), "ModTime: %v", fi.ModTime())
 	ExpectFalse(fi.IsDir())
 	ExpectEq(1, fi.Sys().(*syscall.Stat_t).Nlink)
 }
 
 func (t *HelloFSTest) Stat_NonExistent() {
-	_, err := os.Stat(path.Join(t.mfs.Dir(), "foobar"))
+	_, err := os.Stat(path.Join(t.Dir, "foobar"))
 
 	AssertNe(nil, err)
 	ExpectThat(err, Error(HasSubstr("no such file")))
 }
 
 func (t *HelloFSTest) ReadFile_Hello() {
-	slice, err := ioutil.ReadFile(path.Join(t.mfs.Dir(), "hello"))
+	slice, err := ioutil.ReadFile(path.Join(t.Dir, "hello"))
 
 	AssertEq(nil, err)
 	ExpectEq("Hello, world!", string(slice))
 }
 
 func (t *HelloFSTest) ReadFile_Dir() {
-	_, err := ioutil.ReadFile(path.Join(t.mfs.Dir(), "dir"))
+	_, err := ioutil.ReadFile(path.Join(t.Dir, "dir"))
 
 	AssertNe(nil, err)
 	ExpectThat(err, Error(HasSubstr("is a directory")))
 }
 
 func (t *HelloFSTest) ReadFile_World() {
-	slice, err := ioutil.ReadFile(path.Join(t.mfs.Dir(), "dir/world"))
+	slice, err := ioutil.ReadFile(path.Join(t.Dir, "dir/world"))
 
 	AssertEq(nil, err)
 	ExpectEq("Hello, world!", string(slice))
@@ -221,7 +178,7 @@ func (t *HelloFSTest) OpenAndRead() {
 	var err error
 
 	// Open the file.
-	f, err := os.Open(path.Join(t.mfs.Dir(), "hello"))
+	f, err := os.Open(path.Join(t.Dir, "hello"))
 	defer func() {
 		if f != nil {
 			ExpectEq(nil, f.Close())
@@ -268,7 +225,7 @@ func (t *HelloFSTest) OpenAndRead() {
 }
 
 func (t *HelloFSTest) Open_NonExistent() {
-	_, err := os.Open(path.Join(t.mfs.Dir(), "foobar"))
+	_, err := os.Open(path.Join(t.Dir, "foobar"))
 
 	AssertNe(nil, err)
 	ExpectThat(err, Error(HasSubstr("no such file")))
diff --git a/samples/testing.go b/samples/testing.go
index cb2c1f3..abce905 100644
--- a/samples/testing.go
+++ b/samples/testing.go
@@ -77,6 +77,13 @@ func (t *SampleTest) initialize(
 		return
 	}
 
+	// Wait for it to be read.
+	err = t.mfs.WaitForReady(t.Ctx)
+	if err != nil {
+		err = fmt.Errorf("WaitForReady: %v", err)
+		return
+	}
+
 	return
 }