Add test cases for condensed form of hashlib usage

Ref: https://docs.python.org/3.6/library/hashlib.html#hash-algorithms

Author: Kroisse

tests/snippets/stdlib_hashlib.py

@@ -4,26 +4,32 @@
 # print(hashlib.md5)
 h = hashlib.md5()
 h.update(b'a')
-assert h.name == 'md5'
+g = hashlib.md5(b'a')
+assert h.name == g.name == 'md5'
 print(h.hexdigest())
+print(g.hexdigest())
 
-assert h.hexdigest() == '0cc175b9c0f1b6a831c399e269772661'
-assert h.digest_size == 16
+assert h.hexdigest() == g.hexdigest() == '0cc175b9c0f1b6a831c399e269772661'
+assert h.digest_size == g.digest_size == 16
 
 h = hashlib.sha256()
 h.update(b'a')
-assert h.name == 'sha256'
-assert h.digest_size == 32
+g = hashlib.sha256(b'a')
+assert h.name == g.name == 'sha256'
+assert h.digest_size == g.digest_size == 32
 print(h.hexdigest())
+print(g.hexdigest())
 
-assert h.hexdigest() == 'ca978112ca1bbdcafac231b39a23dc4da786eff8147c4e72b9807785afee48bb'
+assert h.hexdigest() == g.hexdigest() == 'ca978112ca1bbdcafac231b39a23dc4da786eff8147c4e72b9807785afee48bb'
 
 h = hashlib.sha512()
-assert h.name == 'sha512'
+g = hashlib.sha512(b'a')
+assert h.name == g.name == 'sha512'
 h.update(b'a')
 print(h.hexdigest())
+print(g.hexdigest())
 
-assert h.hexdigest() == '1f40fc92da241694750979ee6cf582f2d5d7d28e18335de05abc54d0560e0f5302860c652bf08d560252aa5e74210546f369fbbbce8c12cfc7957b2652fe9a75'
+assert h.hexdigest() == g.hexdigest() == '1f40fc92da241694750979ee6cf582f2d5d7d28e18335de05abc54d0560e0f5302860c652bf08d560252aa5e74210546f369fbbbce8c12cfc7957b2652fe9a75'
 
 h = hashlib.new("blake2s", b"fubar")
 print(h.hexdigest())