diff --git a/bidi-test.py b/bidi-test.py
new file mode 100755
index 0000000..4b254d2
--- /dev/null
+++ b/bidi-test.py
@@ -0,0 +1,160 @@
+#!/usr/bin/python3
+import asyncio
+import json
+import logging
+import os
+import threading
+import time
+from typing import Any
+
+import bidi
+
+
+def jsquote(js: object) -> str:
+    return json.dumps(js)
+
+JsonObject = dict[str, Any]
+
+
+# shape of our testlib.Browser, all sync
+class Browser:
+    driver: bidi.WebdriverBidi
+
+    @staticmethod
+    def asyncio_loop_thread(loop: asyncio.AbstractEventLoop) -> None:
+        asyncio.set_event_loop(loop)
+        loop.run_forever()
+
+    def __init__(self) -> None:
+        # FIXME: raise to our standard 15
+        self.timeout = 5
+        headless = not bool(os.environ.get("TEST_SHOW_BROWSER", ""))
+        browser = os.environ.get("TEST_BROWSER", "chromium")
+        if browser == "chromium":
+            self.driver = bidi.ChromiumBidi(headless=headless)
+        elif browser == "firefox":
+            self.driver = bidi.FirefoxBidi(headless=headless)
+        else:
+            raise ValueError(f"unknown browser {browser}")
+        self.loop = asyncio.new_event_loop()
+        self.bidi_thread = threading.Thread(target=self.asyncio_loop_thread, args=(self.loop,))
+        self.bidi_thread.start()
+
+        asyncio.run_coroutine_threadsafe(self.driver.start_session(), self.loop).result()
+
+    def close(self):
+        asyncio.run_coroutine_threadsafe(self.driver.close(), self.loop).result()
+        self.loop.call_soon_threadsafe(self.loop.stop)
+        self.bidi_thread.join()
+
+    def bidi(self, method, **params) -> JsonObject:
+        """Send a Webdriver BiDi command and return the JSON response"""
+
+        return asyncio.run_coroutine_threadsafe(self.driver.bidi(method, **params), self.loop).result()
+
+    def wait_js_cond(self, cond: str, error_description: str = "null") -> None:
+        for _retry in range(5):
+            try:
+                self.bidi("script.evaluate",
+                        expression=f"window.ph_wait_cond(() => {cond}, {self.timeout * 1000}, {error_description})",
+                        awaitPromise=True, target={"context": self.driver.context})
+                return
+            except bidi.WebdriverError as e:
+                # can happen when waiting across page reloads
+                if (
+                    # chromium
+                    "Execution context was destroyed" in str(e) or
+                    "Cannot find context" in str(e) or
+                    # firefox
+                    "MessageHandlerFrame' destroyed" in str(e)
+                   ):
+                    time.sleep(1)
+                else:
+                    raise
+
+    def _wait_present(self, selector: str) -> None:
+        self.wait_js_cond(f"window.ph_find({jsquote(selector)})")
+
+    def wait_visible(self, selector: str) -> None:
+        self._wait_present(selector)
+        self.wait_js_cond(f"window.ph_is_visible({jsquote(selector)})")
+
+    def open(self, href: str) -> None:
+        self.bidi("browsingContext.navigate", context=self.driver.context, url=href, wait="complete")
+
+    def focus(self, selector: str) -> None:
+        self.wait_visible(selector)
+        self.bidi("script.evaluate", expression=f"document.querySelector('{selector}').focus()",
+                  awaitPromise=False, target={"context": self.driver.context})
+
+    def input_text(self, text: str) -> None:
+        actions = []
+        for c in text:
+            actions.append({"type": "keyDown", "value": c})
+            actions.append({"type": "keyUp", "value": c})
+        self.bidi("input.performActions", context=self.driver.context, actions=[
+            {"type": "key", "id": "key-0", "actions": actions}])
+
+    def set_input_text(self, selector: str, val: str) -> None:
+        self.focus(selector)
+        self.input_text(val)
+        # TODO: wait for value
+        time.sleep(0.2)
+
+    def mouse(self, selector: str, button: int = 0, click_count: int = 1) -> None:
+        self.wait_visible(selector)
+        element = self.bidi("script.evaluate", expression=f"window.ph_find({jsquote(selector)})",
+                            awaitPromise=False, target={"context": self.driver.context})["result"]
+
+        actions = [{"type": "pointerMove", "x": 0, "y": 0, "origin": {"type": "element", "element": element}}]
+        for _ in range(click_count):
+            actions.append({"type": "pointerDown", "button": button})
+            actions.append({"type": "pointerUp", "button": button})
+
+        self.bidi("input.performActions", context=self.driver.context, actions=[
+            {
+                "id": "pointer-0",
+                "type": "pointer",
+                "parameters": {"pointerType": "mouse"},
+                "actions": actions,
+            }
+        ])
+
+    def click(self, selector: str) -> None:
+        return self.mouse(selector)
+
+    def wait_text(self, selector: str, text: str) -> None:
+        self.wait_visible(selector)
+        self.wait_js_cond(f"window.ph_text({jsquote(selector)}) == {jsquote(text)}",
+                          error_description=f"() => 'actual text: ' + window.ph_text({jsquote(selector)})")
+
+    def wait_in_text(self, selector: str, text: str) -> None:
+        self.wait_visible(selector)
+        self.wait_js_cond(f"window.ph_text({jsquote(selector)}).includes({jsquote(text)})",
+                          error_description=f"() => 'actual text: ' + window.ph_text({jsquote(selector)})")
+
+    def switch_to_frame(self, name: str | None) -> None:
+        if name is None:
+            self.switch_to_top()
+        else:
+            asyncio.run_coroutine_threadsafe(self.driver.switch_to_frame(name), self.loop).result()
+
+    def switch_to_top(self) -> None:
+        self.driver.switch_to_top()
+
+
+# sync code, like our tests
+logging.basicConfig(level=logging.DEBUG)
+b = Browser()
+try:
+    b.open("http://127.0.0.2:9091")
+
+    b.set_input_text("#login-user-input", "admin")
+    b.set_input_text("#login-password-input", "foobar")
+    b.click("#login-button")
+    b.wait_text("#super-user-indicator", "Limited access")
+
+    b.switch_to_frame("cockpit1:localhost/system")
+    b.wait_in_text(".system-configuration", "Join domain")
+finally:
+    b.close()