feat(core/tests): add smoke test for libtropic

[no changelog]

core/tests/test_trezor.crypto.tropic.py

@@ -0,0 +1,31 @@
+# flake8: noqa: F403,F405
+from common import *  # isort:skip
+
+if utils.USE_TROPIC:
+    from trezor.crypto import tropic
+
+
+@unittest.skipUnless(utils.USE_TROPIC, "tropic")
+class TestCryptoTropic(unittest.TestCase):
+    def test_ping(self):
+        self.assertEqual(tropic.ping(""), "")
+        self.assertEqual(tropic.ping("HeLlO!"), "HeLlO!")
+
+    def test_get_certificate(self):
+        self.assertEqual(len(tropic.get_certificate()), 512)
+
+    def test_sign(self):
+        try:
+            tropic.sign(0, "ASD")
+            assert False
+        except ValueError as e:
+            self.assertIn("invalid length", str(e).lower())
+
+        tropic.key_generate(0)
+
+        # signing should work now that we have a key
+        self.assertEqual(len(tropic.sign(0, "a" * 32)), 64)
+
+
+if __name__ == "__main__":
+    unittest.main()