test: GetAddress returns BIP-86 taproot addresses

Drives the emulator through the full GetAddress path for SPENDTAPROOT --
fsm_msgGetAddress, path_mismatched's m/86' branch, compute_address, the
BIP-86 tweak and bech32m encoding -- none of which the firmware's C unit
tests reach.

Expected values are the three official BIP-86 vectors.  BIP-86 publishes
them against the "abandon abandon ... about" mnemonic, which is exactly
what setup_mnemonic_abandon loads, so these are the spec's constants and
not values our implementation produced.

Verified against a locally built emulator: 1 passed.  Also mutation
checked -- flipping one character of the first expected address makes it
fail, so the assertions are not vacuous.

NOTE: gated at 7.16.0 via TAPROOT_FIRMWARE_VERSION.  develop is currently
7.15.0, so this SKIPS until the project version bumps.  A gate that is
never reached is a test that is silently green forever -- keep the
constant in step with CMakeLists.txt.

Author: BitHighlander

tests/test_msg_getaddress_taproot.py

@@ -0,0 +1,68 @@
+# This file is part of the KeepKey project.
+#
+# This library is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License version 3
+# as published by the Free Software Foundation.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the License along with this library.
+# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
+
+import common
+import unittest
+
+from keepkeylib import types_pb2 as proto
+from keepkeylib.tools import parse_path
+
+
+# Version in which SPENDTAPROOT support lands.  Keep this in step with
+# CMakeLists.txt: if the firmware version is below it these tests SKIP, so a
+# value that is never reached makes them silently green forever.
+TAPROOT_FIRMWARE_VERSION = "7.16.0"
+
+
+class TestMsgGetaddressTaproot(common.KeepKeyTest):
+
+    def test_taproot_bip86_vectors(self):
+        """Official BIP-86 test vectors.
+
+        https://github.com/bitcoin/bips/blob/master/bip-0086.mediawiki
+
+        BIP-86 publishes these against the "abandon abandon ... about"
+        mnemonic, which is exactly what setup_mnemonic_abandon loads.  The
+        expected addresses are therefore the spec's own constants, not values
+        this implementation produced -- the comparison is against independent
+        ground truth.
+        """
+        self.requires_firmware(TAPROOT_FIRMWARE_VERSION)
+        self.setup_mnemonic_abandon()
+        self.client.clear_session()
+
+        # Account 0, first receiving address
+        self.assertEqual(
+            self.client.get_address(
+                "Bitcoin", parse_path("86'/0'/0'/0/0"), False, None,
+                script_type=proto.SPENDTAPROOT),
+            'bc1p5cyxnuxmeuwuvkwfem96lqzszd02n6xdcjrs20cac6yqjjwudpxqkedrcr')
+
+        # Account 0, second receiving address
+        self.assertEqual(
+            self.client.get_address(
+                "Bitcoin", parse_path("86'/0'/0'/0/1"), False, None,
+                script_type=proto.SPENDTAPROOT),
+            'bc1p4qhjn9zdvkux4e44uhx8tc55attvtyu358kutcqkudyccelu0was9fqzwh')
+
+        # Account 0, first change address
+        self.assertEqual(
+            self.client.get_address(
+                "Bitcoin", parse_path("86'/0'/0'/1/0"), False, None,
+                script_type=proto.SPENDTAPROOT),
+            'bc1p3qkhfews2uk44qtvauqyr2ttdsw7svhkl9nkm9s9c3x4ax5h60wqwruhk7')
+
+
+if __name__ == '__main__':
+    unittest.main()