diff --git a/.coveragerc b/.coveragerc
index 7145fa38..17b1266a 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -5,8 +5,8 @@ omit =
     *import_database.py
     *mnemonic_key_create.py
     *sign_raw.py
+    *benchmark.py
     *wallet_multisig_2of3.py
-    *dashd.py
     *bitcoind.py
     *dogecoind.py
     *bcoin.py
@@ -15,9 +15,9 @@ omit =
     *cryptoid.py
     *chainso.py
     *litecoreio.py
-    *insightdash.py
     *litecoinblockexplorer.py
     *bitflyer.py
+    *blocksmurfer.py
 [report]
 exclude_lines =
     pragma: no cover
@@ -29,3 +29,4 @@ exclude_lines =
     if 0:
     if __name__ == .__main__.:
     if not PY3
+    except ImportError
diff --git a/tests/test_encoding.py b/tests/test_encoding.py
index 4b24f170..a29462a3 100644
--- a/tests/test_encoding.py
+++ b/tests/test_encoding.py
@@ -432,6 +432,15 @@ def test_encryption_aes(self):
         quote = aes_decrypt(encrypted_data, key)
         self.assertEqual(data, quote)
 
+class TestEncodingCrypto(unittest.TestCase):
+
+    def test_sha256(self):
+
+        self.assertEqual(sha256(b'a' * 1000000).hex(),
+            'cdc76e5c9914fb9281a1c7e284d73e67f1809a48a497200e046d39ccc7112cd0')
+        self.assertEqual(sha256(b'a' * 1000000, as_hex=True),
+            'cdc76e5c9914fb9281a1c7e284d73e67f1809a48a497200e046d39ccc7112cd0')
+
 
 if __name__ == '__main__':
     unittest.main()