diff --git a/deltachat-rpc-client/tests/test_cross_core.py b/deltachat-rpc-client/tests/test_cross_core.py
new file mode 100644
index 000000000..9f77ae844
--- /dev/null
+++ b/deltachat-rpc-client/tests/test_cross_core.py
@@ -0,0 +1,83 @@
+import os
+import subprocess
+import sys
+
+import execnet
+
+
+def get_cross_v220(tmp_path, alice):
+    venv = tmp_path.joinpath("venv1")
+    python = sys.executable
+    subprocess.check_call([python, "-m", "venv", venv])
+    v = "2.20.0"
+    pip = venv.joinpath("bin", "pip")
+    subprocess.check_call([pip, "install", "pytest", f"deltachat-rpc-server=={v}", f"deltachat-rpc-client=={v}"])
+
+    python = venv.joinpath("bin", "python")
+    gw = execnet.makegateway(f"popen//python={python}")
+
+    accounts_dir = str(tmp_path.joinpath("account1_venv1"))
+    channel = gw.remote_exec(v220_loop)
+    channel.send((accounts_dir, str(venv.joinpath("bin", "deltachat-rpc-server")), os.environ.get("CHATMAIL_DOMAIN")))
+    sysinfo = channel.receive()
+    assert sysinfo == "v2.20.0"
+    channel.send(alice.self_contact.make_vcard())
+
+    def eval(eval_str):
+        channel.send(eval_str)
+        return channel.receive()
+
+    return eval
+
+
+def v220_loop(channel):
+    import os
+    import pathlib
+
+    from deltachat_rpc_client import DeltaChat, Rpc
+    from deltachat_rpc_client.pytestplugin import ACFactory
+
+    accounts_dir, rpc_server_path, chatmail_domain = channel.receive()
+    os.environ["CHATMAIL_DOMAIN"] = chatmail_domain
+    bin_path = str(pathlib.Path(rpc_server_path).parent)
+    os.environ["PATH"] = bin_path + ":" + os.environ["PATH"]
+
+    rpc = Rpc(accounts_dir=accounts_dir)
+    with rpc:
+        dc = DeltaChat(rpc)
+        channel.send(dc.rpc.get_system_info()["deltachat_core_version"])
+        acfactory = ACFactory(dc)
+        bob = acfactory.get_online_account()
+        alice_vcard = channel.receive()
+        [alice_contact] = bob.import_vcard(alice_vcard)
+        ns = {"bob": bob, "alice_contact": alice_contact}
+
+        while 1:
+            eval_str = channel.receive()
+            res = eval(eval_str, ns)
+            try:
+                channel.send(res)
+            except Exception:
+                # some unserializable result
+                channel.send(None)
+
+
+def test_qr_setup_contact(acfactory, tmp_path) -> None:
+    (alice,) = acfactory.get_online_accounts(1)
+
+    remote_eval = get_cross_v220(tmp_path, alice)
+
+    qr_code = alice.get_qr_code()
+    remote_eval(f"bob.secure_join({qr_code!r})")
+    alice.wait_for_securejoin_inviter_success()
+
+    # Test that Alice verified Bob's profile.
+    vcard = remote_eval("bob.self_contact.make_vcard()")
+    [alice_contact_bob] = alice.import_vcard(vcard)
+    alice_contact_bob_snapshot = alice_contact_bob.get_snapshot()
+    assert alice_contact_bob_snapshot.is_verified
+
+    remote_eval("bob.wait_for_securejoin_joiner_success()")
+
+    # Test that Bob verified Alice's profile.
+    assert remote_eval("alice_contact.get_snapshot().is_verified")