diff --git a/tests/test_imports.py b/tests/test_imports.py
new file mode 100644
index 0000000..cd2db09
--- /dev/null
+++ b/tests/test_imports.py
@@ -0,0 +1,56 @@
+"""Public API surface — what users actually import."""
+import importlib
+
+import pytest
+
+
+def test_top_level_import():
+    import invisible_playwright as ip
+    assert hasattr(ip, "InvisiblePlaywright")
+    assert hasattr(ip, "BINARY_VERSION")
+    assert hasattr(ip, "FIREFOX_UPSTREAM_VERSION")
+    assert hasattr(ip, "__version__")
+
+
+def test_version_string():
+    from invisible_playwright import __version__
+    parts = __version__.split(".")
+    assert len(parts) >= 2
+    assert all(p.isdigit() or p.replace("-", "").replace("rc", "").isdigit()
+               or any(c.isdigit() for c in p) for p in parts)
+
+
+def test_sync_api_module():
+    from invisible_playwright.sync_api import InvisiblePlaywright as SyncCls
+    from invisible_playwright import InvisiblePlaywright as TopCls
+    assert SyncCls is TopCls
+
+
+def test_async_api_module_importable():
+    mod = importlib.import_module("invisible_playwright.async_api")
+    assert hasattr(mod, "InvisiblePlaywright")
+
+
+def test_async_class_is_distinct_from_sync():
+    from invisible_playwright import InvisiblePlaywright as Sync
+    from invisible_playwright.async_api import InvisiblePlaywright as Async
+    assert Sync is not Async
+
+
+@pytest.mark.parametrize("name", [
+    "constants",
+    "download",
+    "prefs",
+    "launcher",
+    "cli",
+    "_proxy",
+    "_fpforge",
+])
+def test_submodule_importable(name):
+    importlib.import_module(f"invisible_playwright.{name}")
+
+
+def test_dunder_all_is_complete():
+    import invisible_playwright as ip
+    for name in ip.__all__:
+        assert hasattr(ip, name), f"{name} declared in __all__ but missing"