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diff --git a/packages/meshbay-hub/tests/test_spa_ordering.py b/packages/meshbay-hub/tests/test_spa_ordering.py
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+"""
+Ordering guards for the SPA's connect() flow.
+
+These are source-level checks, which is not how one would normally test
+behaviour. They exist because a specific class of bug shipped to a live browser
+twice and no other test could see it: `connect()` is a long sequence in which
+later steps read values earlier steps set, and the Python end-to-end client in
+QE/deploy/ cannot catch a mistake there — it is a different implementation,
+written in the right order by construction, so it passes while the browser fails.
+
+Concretely: join_request signs a transcript over the node key and the node nonce,
+and runs *before* the GEK proof, because a first-time member has no GEK to prove.
+Both values were being read further down, next to the proof that also uses them,
+so every invited member hit "Handshake incomplete — reconnect and retry".
+
+If you restructure connect(), these will fail. Check the invariant still holds —
+that nothing reads a value assigned later — and then move the markers.
+"""
+
+from pathlib import Path
+
+import pytest
+
+STATIC = (Path(__file__).resolve().parents[1]
+          / "src" / "meshbay_hub" / "static")
+TRANSPORT = STATIC / "transport.js"
+
+pytestmark = pytest.mark.skipif(
+    not TRANSPORT.exists(), reason="SPA sources not present")
+
+
+def _positions(*needles: str) -> list[int]:
+    source = TRANSPORT.read_text()
+    out = []
+    for needle in needles:
+        idx = source.find(needle)
+        assert idx != -1, f"{needle!r} is gone from transport.js — update this test"
+        out.append(idx)
+    return out
+
+
+def test_challenge_values_are_captured_before_joining():
+    """
+    joinGroup() signs over node_pk and nonce_node, so both must be recorded when
+    the challenge arrives — not later, beside the proof.
+    """
+    # Deliberately loose markers: what matters is where the assignment happens,
+    # not how it is spelled, so a reordering fails on the ordering assertion
+    # below rather than on a missing string.
+    node_pk, nonce_node, join_call = _positions(
+        "this.nodePk = reply.node_pk",
+        "this._nonceNode = ",
+        "await this.joinGroup(",
+    )
+    assert node_pk < join_call, (
+        "node_pk is read from the challenge after joinGroup() runs — the join "
+        "would sign a transcript naming nothing")
+    assert nonce_node < join_call, (
+        "nonce_node is captured after joinGroup() runs — the join would not be "
+        "bound to this connection")
+
+
+def test_join_happens_before_the_gek_proof():
+    """
+    The whole point of joining in the pre-proof window: someone who has never
+    held the group key cannot produce a proof, so the key has to arrive first.
+    """
+    join_call, proof = _positions(
+        "await this.joinGroup(",
+        "await C.handshakeProof(",
+    )
+    assert join_call < proof, (
+        "the join must happen before the GEK proof — a first-time member has no "
+        "key to prove with")
+
+
+def test_the_ack_still_verifies_the_announced_node_key():
+    """
+    Taking node_pk from the challenge is only safe because the ack proves it and
+    the client compares the two. Losing that check would leave the announcement
+    trusted on its own.
+    """
+    source = TRANSPORT.read_text()
+    assert "Node identity changed during the handshake" in source, (
+        "the challenge's node_pk must be checked against the ack's")
+    assert "verifyNodeSignature" in source, (
+        "the ack's signature over the handshake transcript must still be verified")