tests: use new trezorlib locking/sessioning API where appropriate

tests/device_tests/test_msg_changepin.py

@@ -27,7 +27,7 @@ pytestmark = pytest.mark.skip_t2
 
 
 def _check_pin(client, pin):
-    client.clear_session()
+    client.lock()
     with client:
         client.use_pin_sequence([pin])
         client.set_expected_responses([messages.PinMatrixRequest(), messages.Address()])
@@ -35,7 +35,7 @@ def _check_pin(client, pin):
 
 
 def _check_no_pin(client):
-    client.clear_session()
+    client.lock()
     with client:
         client.set_expected_responses([messages.Address()])
         client.call(messages.GetAddress())

tests/device_tests/test_msg_changepin_t2.py

@@ -27,7 +27,7 @@ pytestmark = pytest.mark.skip_t1
 
 
 def _check_pin(client, pin):
-    client.clear_session()
+    client.lock()
     assert client.features.pin_protection is True
     assert client.features.unlocked is False
 
@@ -38,7 +38,7 @@ def _check_pin(client, pin):
 
 
 def _check_no_pin(client):
-    client.clear_session()
+    client.lock()
     assert client.features.pin_protection is False
 
     with client:

tests/device_tests/test_passphrase_slip39_advanced.py

@@ -35,7 +35,7 @@ def test_128bit_passphrase(client):
     client.use_passphrase("TREZOR")
     address = get_test_address(client)
     assert address == "mkKDUMRR1CcK8eLAzCZAjKnNbCquPoWPxN"
-    client.state = None
+
     client.clear_session()
     client.use_passphrase("ROZERT")
     address_compare = get_test_address(client)
@@ -54,7 +54,7 @@ def test_256bit_passphrase(client):
     client.use_passphrase("TREZOR")
     address = get_test_address(client)
     assert address == "mxVtGxUJ898WLzPMmy6PT1FDHD1GUCWGm7"
-    client.state = None
+
     client.clear_session()
     client.use_passphrase("ROZERT")
     address_compare = get_test_address(client)