diff --git a/hydrachain/tests/test_serpent_contract.py b/hydrachain/tests/test_serpent_contract.py
new file mode 100644
index 0000000..16c1e2f
--- /dev/null
+++ b/hydrachain/tests/test_serpent_contract.py
@@ -0,0 +1,25 @@
+from ethereum import tester
+import serpent
+import logging
+logging.NOTSET = logging.INFO
+tester.disable_logging()
+
+
+def test_send_contract():
+    serpent_code = '''
+def main(a,b):
+    return(a ^ b)
+'''
+    s = tester.state()
+    assert len(s.blocks) == 1
+    head = s.blocks[0]
+    evm_code = serpent.compile(serpent_code)
+    s._send(tester.k0, b'', 0, evmdata=evm_code)
+    creates = head.get_transaction(0).creates
+    s.mine()
+
+    assert len(s.blocks) == 2
+    head = s.blocks[-1]
+    code = head.account_to_dict(creates)['code']
+    assert len(code) > 2
+    assert code != '0x'
diff --git a/requirements.txt b/requirements.txt
index a35b3db..aa98473 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,4 +4,4 @@ c_secp256k1==0.0.8
 bitcoin
 simpy
 pytest==2.8.2
-serpent
+pipdeptree
diff --git a/tox.ini b/tox.ini
index 4702c3d..d8e2f3c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,6 +11,7 @@ deps =
 passenv = DOCKER_HOST DOCKER_TLS_VERIFY DOCKER_CERT_PATH
 
 commands =
+    pipdeptree
     coverage run --source hydrachain --branch -m py.test {posargs}