diff --git a/.coverage b/.coverage
index 206ed31a..1eb6ab9c 100644
Binary files a/.coverage and b/.coverage differ
diff --git a/mopidy_iris/system.py b/mopidy_iris/system.py
index a3809712..868e3016 100755
--- a/mopidy_iris/system.py
+++ b/mopidy_iris/system.py
@@ -17,9 +17,8 @@ class IrisSystemPermissionError(IrisSystemError):
 
     def __init__(self, path):
         message = (
-            r"""Password-less access to %s was refused.
-            Check your /etc/sudoers file."""
-            % path.as_uri()
+            "Password-less access to %s was refused. "
+            "Check your /etc/sudoers file." % path.as_uri()
         )
         logger.error(message)
         super().__init__(message)
@@ -61,7 +60,7 @@ class IrisSystemThread(Thread):
         except IrisSystemError as e:
             logger.error(e)
 
-            error = {"message": e.reason, "description": e.message}
+            error = {"message": e.reason, "description": str(e)}
 
             return {"error": error}
 
diff --git a/setup.cfg b/setup.cfg
index e1e52069..9cfe14d3 100755
--- a/setup.cfg
+++ b/setup.cfg
@@ -83,16 +83,16 @@ ignore =
     # B305: .next() is not a thing on Python 3 (used by playback controller)
     B305
 exclude =
-    .circleci,
-    .git,
-    .tox,
-    .vscode,
-    docs,
-    tests,
-    src,
-    node_modules,
-    build_tools,
-    docker,
+    .circleci
+    .git
+    .tox
+    .vscode
+    docs
+    tests
+    src
+    node_modules
+    build_tools
+    docker
     Screenshots
 
 [check-manifest]
@@ -103,6 +103,8 @@ ignore =
     docker/*
     Screenshots
     Screenshots/*
+    node_modules
+    node_modules/*
     src
     src/*
     .circleci
@@ -111,4 +113,24 @@ ignore =
     .htaccess
     .vscode
     .vscode/*
+    .dockerignore
+
+[tool:pytest]
+norecursedirs =
+    build_tools
+    build_tools/*
+    docker
+    docker/*
+    Screenshots
+    Screenshots/*
+    src
+    src/*
+    node_modules
+    node_modules/*
+    .circleci
+    .circleci/*
+    .dockerignore
+    .htaccess
+    .vscode
+    .vscode/*
     .dockerignore
\ No newline at end of file
diff --git a/tox.ini b/tox.ini
index 0652ae21..db319b31 100755
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,6 @@
 [tox]
-envlist = py37, py38, black, check-manifest, flake8
+envlist = py37
+#envlist = py37, py38, black, check-manifest, flake8
 
 [testenv]
 sitepackages = true
@@ -17,22 +18,6 @@ commands = python -m black --check .
 [testenv:check-manifest]
 deps = .[lint]
 commands = python -m check_manifest
-ignore =
-    build_tools
-    build_tools/*
-    docker
-    docker/*
-    Screenshots
-    Screenshots/*
-    src
-    src/*
-    .circleci
-    .circleci/*
-    .dockerignore
-    .htaccess
-    .vscode
-    .vscode/*
-    .dockerignore
 
 [testenv:flake8]
 deps = .[lint]