diff --git a/atom/property.py b/atom/property.py
index 87bcbdb8..61b8c1fb 100644
--- a/atom/property.py
+++ b/atom/property.py
@@ -46,7 +46,7 @@ def __init__(self, fget=None, fset=None, fdel=None, cached=False):
         self.set_getattr_mode(gm, fget)
         if cached and fset is not None:
             raise ValueError(
-                "Cached property are read-only, but a setter was " "specified."
+                "Cached property are read-only, but a setter was specified."
             )
         self.set_setattr_mode(SetAttr.Property, fset)
         self.set_delattr_mode(DelAttr.Property, fdel)
@@ -104,7 +104,7 @@ def setter(self, func):
         """
         if self.cached:
             raise ValueError(
-                "Cached property are read-only, but a setter was " "specified."
+                "Cached property are read-only, but a setter was specified."
             )
         self.set_setattr_mode(SetAttr.Property, func)
         return func
diff --git a/tests/test_mem.py b/tests/test_mem.py
index c8895840..ab685e91 100644
--- a/tests/test_mem.py
+++ b/tests/test_mem.py
@@ -105,12 +105,12 @@ def test_mem_usage(label):
         last_info = stats.memory_info()
         # Allow slight memory decrease over time to make tests more resilient
         if first_info != last_info:
-            assert (
-                first_info.rss >= last_info.rss >= 0
-            ), "Memory leaked:\n  {}\n  {}".format(first_info, last_info)
-            assert (
-                first_info.vms >= last_info.vms >= 0
-            ), "Memory leaked:\n  {}\n  {}".format(first_info, last_info)
+            assert first_info.rss >= last_info.rss >= 0, (
+                "Memory leaked:\n  {}\n  {}".format(first_info, last_info)
+            )
+            assert first_info.vms >= last_info.vms >= 0, (
+                "Memory leaked:\n  {}\n  {}".format(first_info, last_info)
+            )
     finally:
         p.kill()
         p.join()