Let's see how the graph changes if we only cover nkms.

.coveragerc

@@ -0,0 +1,2 @@
+[run]
+source=nkms

.gitignore

@@ -8,3 +8,4 @@ __pycache__
 /MANIFEST
 /.tox
 /.idea
+.coverage

.travis.yml

@@ -7,7 +7,7 @@ install:
 - pip install pipenv --upgrade
 - pipenv install --dev --three
 script:
-- pipenv run "pytest --cov=./ -v tests"
+- pipenv run "pytest --cov=./nkms/* -v tests"
 - codecov
 notifications:
   slack:

nkms/crypto/powers.py

@@ -69,8 +69,8 @@ class CryptoPower(object):
         """
         try:
             sig_keypair = self._power_ups[SigningPower]
-        except KeyError:
-            raise NoSigningPower
+        except KeyError as e:
+            raise NoSigningPower(e)
         msg_digest = b"".join(API.keccak_digest(m) for m in messages)
 
         return sig_keypair.sign(msg_digest)