test(ios): add unit tests for pickSimulator and iOS flag parsing

Tests for all pickSimulator branches (by name, by UDID, unknown, empty
list, iPhone preference, fallback to first). Also tests BootedUDID on a
canceled context and verifies --platform ios and --ios-device flags are
accepted by parseTestArgs.

cmd/sanderling/main_test.go

@@ -146,6 +146,35 @@ func TestRun_Doctor(t *testing.T) {
 	}
 }
 
+func TestParseTestArgs_AcceptsIosPlatform(t *testing.T) {
+	options, err := parseTestArgs([]string{
+		"--spec", "s.ts",
+		"--bundle-id", "com.example.app",
+		"--platform", "ios",
+	}, io.Discard)
+	if err != nil {
+		t.Fatalf("unexpected error for ios platform: %v", err)
+	}
+	if options.platform != "ios" {
+		t.Errorf("expected platform=ios, got %q", options.platform)
+	}
+}
+
+func TestParseTestArgs_IosDeviceFlag(t *testing.T) {
+	options, err := parseTestArgs([]string{
+		"--spec", "s.ts",
+		"--bundle-id", "com.example.app",
+		"--platform", "ios",
+		"--ios-device", "iPhone 15 Pro",
+	}, io.Discard)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if options.iosDevice != "iPhone 15 Pro" {
+		t.Errorf("expected iosDevice=iPhone 15 Pro, got %q", options.iosDevice)
+	}
+}
+
 func TestRun_TestSubcommand_PipelineErrors(t *testing.T) {
 	// Without a real spec, a real device, or a bootable AVD the pipeline
 	// must surface a specific error rather than panicking — proves the flag

internal/ios/ios_test.go

@@ -0,0 +1,89 @@
+package ios
+
+import (
+	"context"
+	"testing"
+)
+
+func TestPickSimulator_ByName(t *testing.T) {
+	available := []simDevice{
+		{UDID: "aaa", Name: "iPad Pro", IsAvailable: true},
+		{UDID: "bbb", Name: "iPhone 15", IsAvailable: true},
+	}
+	got, err := pickSimulator("iPhone 15", available)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got.UDID != "bbb" {
+		t.Errorf("got %q, want bbb", got.UDID)
+	}
+}
+
+func TestPickSimulator_ByUDID(t *testing.T) {
+	available := []simDevice{
+		{UDID: "aaa", Name: "iPad Pro", IsAvailable: true},
+		{UDID: "bbb", Name: "iPhone 14", IsAvailable: true},
+	}
+	got, err := pickSimulator("aaa", available)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got.Name != "iPad Pro" {
+		t.Errorf("got %q, want iPad Pro", got.Name)
+	}
+}
+
+func TestPickSimulator_UnknownName(t *testing.T) {
+	available := []simDevice{
+		{UDID: "aaa", Name: "iPad Pro", IsAvailable: true},
+	}
+	_, err := pickSimulator("Pixel 7", available)
+	if err == nil {
+		t.Fatal("expected error for unknown simulator name")
+	}
+}
+
+func TestPickSimulator_EmptyName_PrefersIPhone(t *testing.T) {
+	available := []simDevice{
+		{UDID: "aaa", Name: "iPad mini", IsAvailable: true},
+		{UDID: "bbb", Name: "iPhone 16", IsAvailable: true},
+		{UDID: "ccc", Name: "Apple Watch", IsAvailable: true},
+	}
+	got, err := pickSimulator("", available)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got.UDID != "bbb" {
+		t.Errorf("got %q, want bbb (iPhone)", got.UDID)
+	}
+}
+
+func TestPickSimulator_EmptyName_FallsBackToFirst(t *testing.T) {
+	available := []simDevice{
+		{UDID: "aaa", Name: "iPad Air", IsAvailable: true},
+		{UDID: "bbb", Name: "Apple TV", IsAvailable: true},
+	}
+	got, err := pickSimulator("", available)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got.UDID != "aaa" {
+		t.Errorf("got %q, want aaa (first available)", got.UDID)
+	}
+}
+
+func TestPickSimulator_EmptyList(t *testing.T) {
+	_, err := pickSimulator("", nil)
+	if err == nil {
+		t.Fatal("expected error for empty simulator list")
+	}
+}
+
+func TestBootedUDID_CanceledContext(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+	udid := BootedUDID(ctx)
+	if udid != "" {
+		t.Errorf("expected empty UDID on canceled context, got %q", udid)
+	}
+}