fix(ios): the device path clears before its runner session too

internal/driver/ioscompanion/device.go

@@ -31,17 +31,22 @@ type DeviceOptions struct {
 	BundleID string
 	// AppPath is the .app bundle installed via devicectl for clear-state.
 	AppPath string
+	// ClearState reinstalls the app while NewDevice runs, before the runner's
+	// test session exists. Clear state is a property of the driver rather than
+	// of a launch: see Launch.
+	ClearState bool
 	// Output receives the runner session log path and driver warnings.
 	Output io.Writer
 	// DoubleTapGapMilliseconds overrides the synthesized double-tap gap.
 	DoubleTapGapMilliseconds float64
 
 	// Test seams. Production leaves them nil and NewDevice wires the real
-	// build/spawn/tunnel/dial.
-	spawnRunner func(ctx context.Context, address string) (*exec.Cmd, error)
-	startTunnel func(ctx context.Context, hardwareUDID, localAddress, devicePort string) (io.Closer, error)
-	dialRunner  func(address string) (transport.Companion, error)
-	pickAddress func() (string, error)
+	// build/spawn/tunnel/dial/devicectl.
+	spawnRunner  func(ctx context.Context, address string) (*exec.Cmd, error)
+	startTunnel  func(ctx context.Context, hardwareUDID, localAddress, devicePort string) (io.Closer, error)
+	dialRunner   func(address string) (transport.Companion, error)
+	pickAddress  func() (string, error)
+	reinstallApp func(ctx context.Context) error
 }
 
 // deviceStartupTimeout bounds the runner's startup once its hosting test
@@ -61,6 +66,9 @@ func NewDevice(ctx context.Context, options DeviceOptions) (*Driver, error) {
 	if options.CoreDeviceID == "" {
 		return nil, errors.New("ios device: CoreDeviceID is required")
 	}
+	if options.ClearState && options.BundleID == "" {
+		return nil, errors.New("ios device: clear-state needs BundleID: there is nothing to uninstall without it")
+	}
 	output := options.Output
 	if output == nil {
 		output = io.Discard
@@ -75,6 +83,7 @@ func NewDevice(ctx context.Context, options DeviceOptions) (*Driver, error) {
 		coreDeviceID:             options.CoreDeviceID,
 		bundleID:                 options.BundleID,
 		appPath:                  options.AppPath,
+		clearStateAtStartup:      options.ClearState,
 		output:                   output,
 		doubleTapGapMilliseconds: gap,
 		deviceMode:               true,
@@ -103,7 +112,10 @@ func NewDevice(ctx context.Context, options DeviceOptions) (*Driver, error) {
 	// Device seams: clear-state reinstalls via devicectl; the container reset and
 	// paste grant are simulator-only and become no-ops. The runner types
 	// natively, so no paste prompt is ever hit.
-	d.reinstallApp = d.devicectlReinstall
+	d.reinstallApp = options.reinstallApp
+	if d.reinstallApp == nil {
+		d.reinstallApp = d.devicectlReinstall
+	}
 	d.resetContainer = d.deviceResetContainerUnsupported
 	d.grantPaste = func(context.Context) error { return nil }
 	d.restart = d.respawnDevice
@@ -116,6 +128,13 @@ func NewDevice(ctx context.Context, options DeviceOptions) (*Driver, error) {
 	}
 	d.deviceLock = lock
 
+	if options.ClearState {
+		if err := d.clearAppState(ctx); err != nil {
+			d.Close()
+			return nil, err
+		}
+	}
+
 	if err := d.bringUpDevice(ctx); err != nil {
 		d.Close()
 		return nil, err

internal/driver/ioscompanion/device_test.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"net"
 	"os/exec"
+	"slices"
 	"testing"
 
 	"github.com/priyanshujain/sanderling/internal/driver/ioscompanion/transport"
@@ -152,6 +153,35 @@ func TestDeviceEraseAndPressKeyRouteThroughEditor(t *testing.T) {
 	}
 }
 
+func TestNewDeviceReinstallsOnceBeforeTheRunnerSession(t *testing.T) {
+	address := startLoopbackListener(t)
+	probe := &clearStateProbe{}
+	options := testDeviceOptions(address, newDeviceCompanion())
+	options.HardwareUDID = "00008140-CLEAR"
+	options.AppPath = "/tmp/Sample.app"
+	options.ClearState = true
+	options.reinstallApp = func(context.Context) error { probe.record("reinstall"); return nil }
+	spawn := options.spawnRunner
+	options.spawnRunner = func(ctx context.Context, runnerAddress string) (*exec.Cmd, error) {
+		probe.record("runner session")
+		return spawn(ctx, runnerAddress)
+	}
+
+	d, err := NewDevice(context.Background(), options)
+	if err != nil {
+		t.Fatalf("NewDevice: %v", err)
+	}
+	defer d.Close()
+	if err := d.Launch(context.Background(), "", true, nil); err != nil {
+		t.Fatalf("Launch: %v", err)
+	}
+
+	want := []string{"reinstall", "runner session"}
+	if got := probe.recorded(); !slices.Equal(got, want) {
+		t.Fatalf("calls = %v, want %v: devicectl must reinstall once, before the runner's test session attaches", got, want)
+	}
+}
+
 func TestDeviceClearStateWithoutAppPathWarnsOnce(t *testing.T) {
 	output := &bytes.Buffer{}
 	d := &Driver{output: output, deviceMode: true}