refactor: code organization cleanup (#35)

* chore: fix gitignore + decisions doc after web->inspect-ui rename

Update web/ references to inspect-ui/ in .gitignore and Makefile. Add
decisions.md tracking architectural decisions from code-org discussion.

* refactor: rename pkg/spec-api to pkg/spec

Aligns the directory name with the npm package name @sanderling/spec.
Updates Makefile, package.json directory field, and resolveSpecAPIPath.

* refactor(verifier): split bindings.go into types.go + bindings.go

Move shared public types (Action, ActionKind, LogEntry, Exception) to
types.go. bindings.go retains internal JS runtime wiring only.

* refactor(inspect): split runs.go into runs.go, runs_cache.go, runs_decode.go

runs.go: types (RunSummary, StepSummary, RunDetail, Run) and Scan.
runs_cache.go: Cache type, Open/Step/Detail methods, parseRun, scanSteps.
runs_decode.go: readMeta, tallyTrace, decodeStepSummary, validRunID.

* refactor: move android_env.go to internal/android/

Extracts Android device/AVD/adb logic into internal/android package.
Exports EnsureDevice, AdbReverse, AdbReverseRemove, EnvWithAndroidPlatformTools, AdbBinary.
Moves tests to internal/android/android_test.go. cmd/sanderling becomes a thin caller.

* refactor: extract test pipeline to internal/testrun/

runTestPipeline logic moves to testrun.Execute. buildDriver, resolveSpecAPIPath,
pickFreePort, and the progress logger move to internal/testrun/. cmd/sanderling/test_run.go
becomes a thin adapter. Tests follow their code.

* ci: update workflow paths after pkg/spec-api -> pkg/spec rename
This commit is contained in:
pj authored and GitHub committed 2026-04-22 20:35:34 +07:00
1 parent 46abb28ed6
commit eed99e58aa
32 files changed
+870 -745

No files matched your search

-235
View File
@@ -1,235 +0,0 @@
package main
import (
"bufio"
"context"
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
"slices"
"strings"
"time"
)
// ensureDevice makes sure an Android device is ready for adb commands.
// Resolution order:
// - if an adb device is already online, use it;
// - else if avdName is set, validate and boot it;
// - else if exactly one AVD exists locally, boot it;
// - else fail with a helpful message listing the available AVDs.
func ensureDevice(ctx context.Context, avdName string, stdout io.Writer) error {
devices, err := listAdbDevices(ctx)
if err != nil {
return fmt.Errorf("list adb devices: %w", err)
}
if len(devices) > 0 {
fmt.Fprintf(stdout, "using connected device: %s\n", devices[0])
return nil
}
avds, err := listAVDs(ctx)
if err != nil {
return fmt.Errorf("list AVDs: %w", err)
}
target, err := pickAVD(avdName, avds)
if err != nil {
return err
}
fmt.Fprintf(stdout, "booting AVD %q...\n", target)
if err := bootAVD(ctx, target); err != nil {
return fmt.Errorf("boot AVD %q: %w", target, err)
}
if err := waitForBoot(ctx, 180*time.Second); err != nil {
return fmt.Errorf("wait for AVD boot: %w", err)
}
fmt.Fprintf(stdout, "AVD %q ready\n", target)
return nil
}
func pickAVD(requested string, available []string) (string, error) {
if requested != "" {
if !slices.Contains(available, requested) {
return "", fmt.Errorf("AVD %q does not exist (available: %s)", requested, strings.Join(available, ", "))
}
return requested, nil
}
switch len(available) {
case 0:
return "", fmt.Errorf("no android device connected and no AVD found; create one in Android Studio or `avdmanager create avd`")
case 1:
return available[0], nil
default:
return "", fmt.Errorf("no android device connected and multiple AVDs available (%s); pick one with --avd", strings.Join(available, ", "))
}
}
func listAdbDevices(ctx context.Context) ([]string, error) {
adb, err := adbBinary()
if err != nil {
return nil, err
}
output, err := exec.CommandContext(ctx, adb, "devices").Output()
if err != nil {
return nil, err
}
return parseAdbDevices(string(output)), nil
}
func parseAdbDevices(output string) []string {
var serials []string
scanner := bufio.NewScanner(strings.NewReader(output))
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
if line == "" || strings.HasPrefix(line, "List of devices") {
continue
}
fields := strings.Fields(line)
if len(fields) >= 2 && fields[1] == "device" {
serials = append(serials, fields[0])
}
}
return serials
}
func listAVDs(ctx context.Context) ([]string, error) {
emulator, err := emulatorBinary()
if err != nil {
return nil, err
}
output, err := exec.CommandContext(ctx, emulator, "-list-avds").Output()
if err != nil {
return nil, err
}
return parseAVDList(string(output)), nil
}
func adbBinary() (string, error) { return findAndroidTool("adb", "platform-tools") }
func emulatorBinary() (string, error) { return findAndroidTool("emulator", "emulator") }
// findAndroidTool locates a binary from the Android SDK. It checks PATH,
// then $ANDROID_HOME/<subdir>/<name> and $ANDROID_SDK_ROOT/<subdir>/<name>,
// then the canonical install locations used by Android Studio and Homebrew.
// Returns a descriptive error when nothing works, so the user knows to set
// $ANDROID_HOME instead of getting a raw "executable file not found".
func findAndroidTool(name, subdir string) (string, error) {
if path, err := exec.LookPath(name); err == nil {
return path, nil
}
var tried []string
for _, root := range androidSDKCandidates() {
candidate := filepath.Join(root, subdir, name)
if info, err := os.Stat(candidate); err == nil && !info.IsDir() {
return candidate, nil
}
tried = append(tried, candidate)
}
return "", fmt.Errorf("could not locate %q: not on PATH and not under any known Android SDK root (set $ANDROID_HOME to point at your SDK; tried %v)", name, tried)
}
func androidSDKCandidates() []string {
var roots []string
seen := map[string]bool{}
addRoot := func(path string) {
if path == "" || seen[path] {
return
}
seen[path] = true
roots = append(roots, path)
}
addRoot(os.Getenv("ANDROID_HOME"))
addRoot(os.Getenv("ANDROID_SDK_ROOT"))
if home, err := os.UserHomeDir(); err == nil {
addRoot(filepath.Join(home, "Library", "Android", "sdk"))
addRoot(filepath.Join(home, "Android", "Sdk"))
}
addRoot("/opt/homebrew/share/android-commandlinetools")
addRoot("/usr/local/share/android-commandlinetools")
return roots
}
func parseAVDList(output string) []string {
var avds []string
scanner := bufio.NewScanner(strings.NewReader(output))
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
if line == "" || strings.HasPrefix(line, "INFO") {
continue
}
avds = append(avds, line)
}
return avds
}
func bootAVD(_ context.Context, name string) error {
emulator, err := emulatorBinary()
if err != nil {
return err
}
command := exec.Command(emulator, "-avd", name, "-no-snapshot-save", "-no-audio", "-no-boot-anim")
if err := command.Start(); err != nil {
return err
}
go func() { _ = command.Wait() }()
return nil
}
func waitForBoot(ctx context.Context, timeout time.Duration) error {
deadline, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
ticker := time.NewTicker(2 * time.Second)
defer ticker.Stop()
for {
if completed, _ := bootCompleted(deadline); completed {
return nil
}
select {
case <-deadline.Done():
return deadline.Err()
case <-ticker.C:
}
}
}
// envWithAndroidPlatformTools returns env with the directory containing adb
// prepended to PATH, so child processes (the sidecar) can invoke adb even
// when the user hasn't set up their shell PATH.
func envWithAndroidPlatformTools(env []string) []string {
adb, err := adbBinary()
if err != nil {
return env
}
adbDir := filepath.Dir(adb)
result := make([]string, 0, len(env))
found := false
for _, entry := range env {
if current, ok := strings.CutPrefix(entry, "PATH="); ok {
if !pathContains(current, adbDir) {
entry = "PATH=" + adbDir + string(os.PathListSeparator) + current
}
found = true
}
result = append(result, entry)
}
if !found {
result = append(result, "PATH="+adbDir)
}
return result
}
func pathContains(path, directory string) bool {
return slices.Contains(strings.Split(path, string(os.PathListSeparator)), directory)
}
func bootCompleted(ctx context.Context) (bool, error) {
adb, err := adbBinary()
if err != nil {
return false, err
}
output, err := exec.CommandContext(ctx, adb, "shell", "getprop", "sys.boot_completed").Output()
if err != nil {
return false, err
}
return strings.TrimSpace(string(output)) == "1", nil
}
-93
View File
@@ -1,93 +0,0 @@
package main
import (
"reflect"
"testing"
)
func TestParseAdbDevices_OnlineOnly(t *testing.T) {
output := `List of devices attached
emulator-5554 device
emulator-5556 offline
physical-abc device
`
got := parseAdbDevices(output)
want := []string{"emulator-5554", "physical-abc"}
if !reflect.DeepEqual(got, want) {
t.Fatalf("got %v, want %v", got, want)
}
}
func TestParseAdbDevices_Empty(t *testing.T) {
output := "List of devices attached\n\n"
got := parseAdbDevices(output)
if len(got) != 0 {
t.Fatalf("got %v, want empty", got)
}
}
func TestParseAVDList_DropsInfoLines(t *testing.T) {
output := `INFO | Storing crashdata in: /tmp/x
Medium_Phone_API_36.0
sanderling_test
`
got := parseAVDList(output)
want := []string{"Medium_Phone_API_36.0", "sanderling_test"}
if !reflect.DeepEqual(got, want) {
t.Fatalf("got %v, want %v", got, want)
}
}
func TestPickAVD_ExplicitName(t *testing.T) {
got, err := pickAVD("Pixel_7", []string{"Pixel_7", "sanderling_test"})
if err != nil {
t.Fatal(err)
}
if got != "Pixel_7" {
t.Fatalf("got %q, want Pixel_7", got)
}
}
func TestPickAVD_ExplicitMissing(t *testing.T) {
_, err := pickAVD("Nope", []string{"Pixel_7"})
if err == nil {
t.Fatal("expected error")
}
}
func TestPickAVD_SingleAvailable(t *testing.T) {
got, err := pickAVD("", []string{"sanderling_test"})
if err != nil {
t.Fatal(err)
}
if got != "sanderling_test" {
t.Fatalf("got %q, want sanderling_test", got)
}
}
func TestPickAVD_AmbiguousWithoutHint(t *testing.T) {
_, err := pickAVD("", []string{"a", "b"})
if err == nil {
t.Fatal("expected error when multiple AVDs and no --avd")
}
}
func TestPickAVD_NoneAvailable(t *testing.T) {
_, err := pickAVD("", nil)
if err == nil {
t.Fatal("expected error when no AVDs exist")
}
}
func TestPathContains(t *testing.T) {
path := "/usr/bin:/opt/tools:/usr/local/bin"
if !pathContains(path, "/opt/tools") {
t.Error("expected /opt/tools in PATH")
}
if pathContains(path, "/nope") {
t.Error("did not expect /nope in PATH")
}
}
-52
View File
@@ -1,52 +0,0 @@
package main
import (
"context"
"fmt"
"io"
"log/slog"
"strings"
)
// newProgressLogger wires a slog.Logger that prints user-facing progress
// lines to the CLI's stdout stream. Info messages render as
// "msg key=value ..." to match the prose style of other CLI prints;
// warnings and errors get a "warn:" / "error:" prefix so they stand
// out in the same stream.
func newProgressLogger(writer io.Writer) *slog.Logger {
return slog.New(&progressHandler{writer: writer, level: slog.LevelInfo})
}
type progressHandler struct {
writer io.Writer
level slog.Level
}
func (h *progressHandler) Enabled(_ context.Context, level slog.Level) bool {
return level >= h.level
}
func (h *progressHandler) Handle(_ context.Context, record slog.Record) error {
var builder strings.Builder
if record.Level >= slog.LevelWarn {
fmt.Fprintf(&builder, "%s: ", strings.ToLower(record.Level.String()))
}
builder.WriteString(record.Message)
record.Attrs(func(attr slog.Attr) bool {
fmt.Fprintf(&builder, " %s=%s", attr.Key, formatAttrValue(attr.Value))
return true
})
builder.WriteByte('\n')
_, err := io.WriteString(h.writer, builder.String())
return err
}
func (h *progressHandler) WithAttrs(_ []slog.Attr) slog.Handler { return h }
func (h *progressHandler) WithGroup(_ string) slog.Handler { return h }
func formatAttrValue(value slog.Value) string {
if value.Kind() == slog.KindString {
return fmt.Sprintf("%q", value.String())
}
return value.String()
}
+10 -279
View File
@@ -2,288 +2,19 @@ package main
import (
"context"
"fmt"
"io"
"math/rand/v2"
"net"
"os"
"os/exec"
"path/filepath"
"strconv"
"time"
"github.com/priyanshujain/sanderling/internal/agent"
"github.com/priyanshujain/sanderling/internal/bundler"
"github.com/priyanshujain/sanderling/internal/driver"
"github.com/priyanshujain/sanderling/internal/driver/chrome"
driverSidecar "github.com/priyanshujain/sanderling/internal/driver/sidecar"
"github.com/priyanshujain/sanderling/internal/runner"
"github.com/priyanshujain/sanderling/internal/sidecar"
"github.com/priyanshujain/sanderling/internal/trace"
"github.com/priyanshujain/sanderling/internal/verifier"
)
const (
socketName = "sanderling-agent"
sidecarStartupTimeout = 30 * time.Second
sdkAcceptTimeout = 60 * time.Second
"github.com/priyanshujain/sanderling/internal/testrun"
)
func runTestPipeline(ctx context.Context, options testOptions, stdout io.Writer) error {
if options.platform == "android" || options.platform == "ios" {
if err := ensureDevice(ctx, options.avd, stdout); err != nil {
return err
}
}
aliases := map[string]string{}
if specApiPath := resolveSpecAPIPath(options.spec); specApiPath != "" {
aliases["@sanderling/spec"] = specApiPath
base := filepath.Dir(specApiPath)
aliases["@sanderling/spec/defaults/properties"] = filepath.Join(base, "defaults/properties.ts")
}
bundle, err := bundler.Bundle(bundler.Options{
EntryFile: options.spec,
Defines: map[string]string{
"SANDERLING_TEST_PHONE": os.Getenv("SANDERLING_TEST_PHONE"),
"SANDERLING_TEST_OTP": os.Getenv("SANDERLING_TEST_OTP"),
},
Aliases: aliases,
})
if err != nil {
return fmt.Errorf("bundle spec: %w", err)
}
fmt.Fprintf(stdout, "bundled spec: %d bytes (sha256=%s)\n", len(bundle.JavaScript), bundle.SHA256[:12])
activeDriver, cleanup, err := buildDriver(ctx, options, stdout)
if err != nil {
return err
}
defer cleanup()
listener, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
return fmt.Errorf("agent listener: %w", err)
}
defer listener.Close()
agentPort := listener.Addr().(*net.TCPAddr).Port
if options.platform != "web" {
if err := adbReverse(socketName, agentPort); err != nil {
return fmt.Errorf("adb reverse: %w", err)
}
defer func() {
if err := adbReverseRemove(socketName); err != nil {
fmt.Fprintf(stdout, "warning: adb reverse cleanup: %v\n", err)
}
}()
fmt.Fprintf(stdout, "forwarded localabstract:%s -> tcp:%d\n", socketName, agentPort)
}
agentServer := agent.NewServer(listener)
type acceptResult struct {
connection *agent.Conn
err error
}
acceptChannel := make(chan acceptResult, 1)
go func() {
acceptCtx, cancel := context.WithTimeout(ctx, sdkAcceptTimeout)
defer cancel()
connection, acceptErr := agentServer.Accept(acceptCtx)
acceptChannel <- acceptResult{connection: connection, err: acceptErr}
}()
if err := activeDriver.Launch(ctx, options.bundleID, false); err != nil {
return fmt.Errorf("launch app: %w", err)
}
fmt.Fprintf(stdout, "launched %s; waiting for SDK to connect (%.0fs timeout)\n", options.bundleID, sdkAcceptTimeout.Seconds())
result := <-acceptChannel
if result.err != nil {
return fmt.Errorf("accept SDK: %w", result.err)
}
connection := result.connection
defer connection.Close()
hello := connection.Hello()
fmt.Fprintf(stdout, "SDK connected: platform=%s app=%s sdk=%s\n", hello.Platform, hello.AppPackage, hello.Version)
seed := options.seed
if seed == 0 {
seed = time.Now().UnixNano()
}
verifierInstance, err := verifier.New(verifier.WithRand(rand.New(rand.NewPCG(uint64(seed), 0))))
if err != nil {
return fmt.Errorf("verifier: %w", err)
}
if err := verifierInstance.Load(string(bundle.JavaScript)); err != nil {
return fmt.Errorf("load spec: %w", err)
}
fmt.Fprintln(stdout, "spec loaded into verifier")
runDirectory := filepath.Join(options.output, time.Now().UTC().Format("20060102-150405"))
traceWriter, err := trace.NewWriter(runDirectory)
if err != nil {
return fmt.Errorf("trace writer: %w", err)
}
defer traceWriter.Close()
meta := trace.Meta{
Seed: seed,
SpecPath: options.spec,
BundleSHA256: bundle.SHA256,
Platform: options.platform,
BundleID: options.bundleID,
StartedAt: time.Now().UTC(),
SanderlingVersion: "0.0.1",
}
if err := traceWriter.WriteMeta(meta); err != nil {
return fmt.Errorf("trace meta: %w", err)
}
defer func() {
endedAt := time.Now().UTC()
meta.EndedAt = &endedAt
_ = traceWriter.WriteMeta(meta)
}()
fmt.Fprintf(stdout, "trace dir: %s\n", runDirectory)
fmt.Fprintf(stdout, "running for %s (seed=%d)\n", options.duration, seed)
summary, err := runner.Run(ctx, runner.Options{
Duration: options.duration,
SnapshotTimeout: 5 * time.Second,
IdleTimeout: 1 * time.Second,
BundleID: options.bundleID,
Connection: connection,
Driver: activeDriver,
Verifier: verifierInstance,
TraceWriter: traceWriter,
Logger: newProgressLogger(stdout),
})
terminateCtx, terminateCancel := context.WithTimeout(context.Background(), 5*time.Second)
_ = activeDriver.Terminate(terminateCtx)
terminateCancel()
if err != nil {
return fmt.Errorf("runner: %w", err)
}
fmt.Fprintf(stdout, "\nrun complete: %d steps in %s\n", summary.Steps, summary.EndTime.Sub(summary.StartTime).Round(time.Millisecond))
if len(summary.Violations) == 0 {
fmt.Fprintln(stdout, "no violations.")
} else {
fmt.Fprintf(stdout, "%d violation record(s):\n", len(summary.Violations))
for _, violation := range summary.Violations {
fmt.Fprintf(stdout, " step %d: %v\n", violation.StepIndex, violation.Properties)
}
}
return nil
}
// buildDriver creates the appropriate DeviceDriver for the platform and returns
// a cleanup function. For web, ChromeDriver is used directly; for android/ios
// the JVM sidecar is extracted, spawned, and dialed.
func buildDriver(ctx context.Context, options testOptions, stdout io.Writer) (driver.DeviceDriver, func(), error) {
if options.platform == "web" {
d := chrome.New()
return d, func() { _ = d.Terminate(context.Background()) }, nil
}
sidecarDirectory := filepath.Join(os.TempDir(), "sanderling-sidecar")
jarPath, err := sidecar.Extract(sidecarDirectory)
if err != nil {
return nil, nil, fmt.Errorf("extract sidecar: %w", err)
}
fmt.Fprintf(stdout, "sidecar JAR: %s (size=%d)\n", jarPath, sidecar.EmbeddedSize())
sidecarPort, err := pickFreePort()
if err != nil {
return nil, nil, err
}
sidecarCommand := exec.CommandContext(ctx, "java", "-jar", jarPath,
"--port", strconv.Itoa(sidecarPort),
"--platform", options.platform,
)
sidecarCommand.Stdout = stdout
sidecarCommand.Stderr = stdout
sidecarCommand.Env = envWithAndroidPlatformTools(os.Environ())
if err := sidecarCommand.Start(); err != nil {
return nil, nil, fmt.Errorf("spawn sidecar: %w", err)
}
fmt.Fprintf(stdout, "sidecar pid=%d listening on 127.0.0.1:%d\n", sidecarCommand.Process.Pid, sidecarPort)
driverClient, err := driverSidecar.Dial(fmt.Sprintf("127.0.0.1:%d", sidecarPort))
if err != nil {
_ = sidecarCommand.Process.Kill()
return nil, nil, fmt.Errorf("dial sidecar: %w", err)
}
healthCtx, healthCancel := context.WithTimeout(ctx, sidecarStartupTimeout)
if err := driverClient.WaitForHealth(healthCtx, 250*time.Millisecond); err != nil {
healthCancel()
_ = sidecarCommand.Process.Kill()
_ = driverClient.Close()
return nil, nil, fmt.Errorf("sidecar health check: %w", err)
}
healthCancel()
fmt.Fprintln(stdout, "sidecar is healthy")
cleanup := func() {
_ = driverClient.Close()
if sidecarCommand.Process != nil {
_ = sidecarCommand.Process.Kill()
}
}
return driverClient, cleanup, nil
}
// resolveSpecAPIPath returns the path to pkg/spec-api/src/index.ts inside
// a sanderling source checkout, searched upward from the spec file and the cwd.
// Returns "" when not found, in which case esbuild resolves @sanderling/spec via
// node_modules the way a downstream user's project would.
func resolveSpecAPIPath(specPath string) string {
candidates := []string{}
if absoluteSpec, err := filepath.Abs(specPath); err == nil {
directory := filepath.Dir(absoluteSpec)
for {
candidates = append(candidates, filepath.Join(directory, "pkg/spec-api/src/index.ts"))
parent := filepath.Dir(directory)
if parent == directory {
break
}
directory = parent
}
}
if cwd, err := os.Getwd(); err == nil {
candidates = append(candidates, filepath.Join(cwd, "pkg/spec-api/src/index.ts"))
}
for _, candidate := range candidates {
if _, err := os.Stat(candidate); err == nil {
return candidate
}
}
return ""
}
func pickFreePort() (int, error) {
listener, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
return 0, err
}
defer listener.Close()
return listener.Addr().(*net.TCPAddr).Port, nil
}
func adbReverse(socket string, port int) error {
adb, err := adbBinary()
if err != nil {
return err
}
command := exec.Command(adb, "reverse", "localabstract:"+socket, fmt.Sprintf("tcp:%d", port))
return command.Run()
}
func adbReverseRemove(socket string) error {
adb, err := adbBinary()
if err != nil {
return err
}
return exec.Command(adb, "reverse", "--remove", "localabstract:"+socket).Run()
return testrun.Execute(ctx, testrun.Options{
Spec: options.spec,
BundleID: options.bundleID,
Platform: options.platform,
AVD: options.avd,
Duration: options.duration,
Seed: options.seed,
Output: options.output,
}, stdout)
}
-52
View File
@@ -1,52 +0,0 @@
package main
import (
"os"
"path/filepath"
"testing"
)
func TestResolveSpecAPIPath_FindsUpwardSibling(t *testing.T) {
root := t.TempDir()
apiPath := filepath.Join(root, "pkg", "spec-api", "src", "index.ts")
if err := os.MkdirAll(filepath.Dir(apiPath), 0o755); err != nil {
t.Fatal(err)
}
if err := os.WriteFile(apiPath, []byte("export {}"), 0o644); err != nil {
t.Fatal(err)
}
specPath := filepath.Join(root, "examples", "app", "spec.ts")
if err := os.MkdirAll(filepath.Dir(specPath), 0o755); err != nil {
t.Fatal(err)
}
if err := os.WriteFile(specPath, []byte(""), 0o644); err != nil {
t.Fatal(err)
}
got := resolveSpecAPIPath(specPath)
if got != apiPath {
t.Fatalf("got %q, want %q", got, apiPath)
}
}
func TestResolveSpecAPIPath_ReturnsEmptyWhenMissing(t *testing.T) {
root := t.TempDir()
specPath := filepath.Join(root, "spec.ts")
if err := os.WriteFile(specPath, []byte(""), 0o644); err != nil {
t.Fatal(err)
}
cwd, err := os.Getwd()
if err != nil {
t.Fatal(err)
}
t.Cleanup(func() { _ = os.Chdir(cwd) })
if err := os.Chdir(root); err != nil {
t.Fatal(err)
}
got := resolveSpecAPIPath(specPath)
if got != "" {
t.Fatalf("got %q, want empty (no sanderling source tree reachable)", got)
}
}