bip-138 add test vectors for sorting and deduplication

bip-0138/test_vectors/derivation_path.json

@@ -59,6 +59,16 @@
     "paths": ["m/0", "m/1"],
     "expected": "0201000000000100000001"
   },
+  {
+    "description": "Unsorted paths are sorted when encoded",
+    "paths": ["m/84'/0'/0'/2'", "m/0/1'/2/3'"],
+    "expected": "0204000000008000000100000002800000030480000054800000008000000080000002"
+  },
+  {
+    "description": "Duplicate paths are deduplicated",
+    "paths": ["m/1", "m/0", "m/1"],
+    "expected": "0201000000000100000001"
+  },
   {
     "description": "BIP-44 account 0: m/44'/0'/0'",
     "paths": ["m/44'/0'/0'"],