diff --git a/tools/testing/tests/solo.py b/tools/testing/tests/solo.py
index 4ad0b3f..0f3fbca 100644
--- a/tools/testing/tests/solo.py
+++ b/tools/testing/tests/solo.py
@@ -48,13 +48,11 @@ class SoloTests(Tester):
         sc.exchange = sc.exchange_fido2
 
         req = SoloClient.format_request(SoloExtension.version, 0, b"A" * 16)
-        assertions, client_data = sc.client.get_assertion(
-            sc.host, "B" * 32, [{"id": req, "type": "public-key"}]
+        a = sc.ctap2.get_assertion(
+            sc.host, b"B" * 32, [{"id": req, "type": "public-key"}]
         )
 
         with Test("Test custom command returned valid assertion"):
-            assert len(assertions) == 1
-            a = assertions[0]
             assert a.auth_data.rp_id_hash == sha256(sc.host.encode("utf8"))
             assert a.credential["id"] == req
             assert (a.auth_data.flags & 0x5) == 0x5