diff --git a/internal/testrun/driver_test.go b/internal/testrun/driver_test.go
new file mode 100644
index 0000000..658a18a
--- /dev/null
+++ b/internal/testrun/driver_test.go
@@ -0,0 +1,28 @@
+package testrun
+
+import (
+	"context"
+	"io"
+	"os/exec"
+	"strings"
+	"testing"
+)
+
+func TestBuildDriverRejectsPhysicalIOS(t *testing.T) {
+	if _, err := exec.LookPath("xcrun"); err != nil {
+		t.Skip("xcrun not on PATH; physical-iOS rejection is reached only after preflight")
+	}
+	options := Options{Platform: "ios"}
+	options.iosIsSimulator = false
+
+	_, cleanup, err := buildDriver(context.Background(), options, io.Discard)
+	if cleanup != nil {
+		cleanup()
+	}
+	if err == nil {
+		t.Fatal("expected physical-device iOS to be rejected")
+	}
+	if !strings.Contains(err.Error(), "not yet supported") {
+		t.Fatalf("expected an unsupported-physical-iOS error, got %v", err)
+	}
+}