Add minimal test for minPinLength extension.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

tests/pico-fido/test_minpinlength.py

@@ -0,0 +1,34 @@
+import pytest
+from fido2.ctap2.extensions import CredProtectExtension
+from fido2.webauthn import UserVerificationRequirement
+from fido2.ctap import CtapError
+from fido2.ctap2.pin import PinProtocolV2, ClientPin
+from fido2.ctap2 import Config
+
+PIN='12345678'
+MINPINLENGTH=6
+
+@pytest.fixture(scope="function")
+def MCMinPin(device):
+    res = device.doMC(rk=True, extensions={'minPinLength': True})['res'].attestation_object
+    return res
+
+@pytest.fixture(scope="function")
+def SetMinPin(device):
+    device.reset()
+    ClientPin(device.client()._backend.ctap2).set_pin(PIN)
+    cfg = FidoConfig(device)
+    cfg.set_min_pin_length(MINPINLENGTH,rp_ids=['example.com'])
+
+def PinToken(device):
+    return ClientPin(device.client()._backend.ctap2).get_pin_token(PIN, permissions=ClientPin.PERMISSION.MAKE_CREDENTIAL | ClientPin.PERMISSION.AUTHENTICATOR_CFG)
+
+def FidoConfig(device):
+    pt = PinToken(device)
+    pin_protocol = PinProtocolV2()
+    return Config(device.client()._backend.ctap2, pin_protocol, pt)
+
+def test_minpin(MCMinPin, SetMinPin):
+    assert MCMinPin.auth_data.extensions
+    assert "minPinLength" in MCMinPin.auth_data.extensions
+    assert MCMinPin.auth_data.extensions['minPinLength'] == MINPINLENGTH