The test for double SHA512

src/tests/samples.py

@@ -2,6 +2,12 @@
 
 from binascii import unhexlify
 
+# hello, page 1 of the Specification
+sample_hash_data = b'hello'
+sample_double_sha512 = unhexlify(
+    '0592a10584ffabf96539f3d780d776828c67da1ab5b169e9e8aed838aaecc9ed36d49ff14'
+    '23c55f019e050c66c6324f53588be88894fef4dcffdb74b98e2b200')
+
 
 # 500 identical peers:
 # 1626611891, 1, 1, 127.0.0.1, 8444

src/tests/test_crypto.py

@@ -17,6 +17,7 @@ except ImportError:
     RIPEMD160 = None
 
 from .samples import (
+    sample_double_sha512, sample_hash_data,
     sample_msg, sample_pubsigningkey, sample_pubencryptionkey,
     sample_privsigningkey, sample_privencryptionkey, sample_ripe,
     sample_sig, sample_sig_sha1
@@ -66,6 +67,12 @@ class TestCrypto(RIPEMD160TestCase, unittest.TestCase):
 class TestHighlevelcrypto(unittest.TestCase):
     """Test highlevelcrypto public functions"""
 
+    def test_double_sha512(self):
+        """Reproduce the example on page 1 of the Specification"""
+        self.assertEqual(
+            highlevelcrypto.double_sha512(sample_hash_data),
+            sample_double_sha512)
+
     def test_randomBytes(self):
         """Dummy checks for random bytes"""
         for n in (8, 32, 64):