diff --git a/PathPlanning/PotentialFieldPlanning/potential_field_planning.py b/PathPlanning/PotentialFieldPlanning/potential_field_planning.py
index e5e13ee8..f77466d6 100644
--- a/PathPlanning/PotentialFieldPlanning/potential_field_planning.py
+++ b/PathPlanning/PotentialFieldPlanning/potential_field_planning.py
@@ -33,6 +33,7 @@ def calc_potential_field(gx, gy, ox, oy, reso, rr):
 
     for ix in range(xw):
         x = ix * reso + minx
+
         for iy in range(yw):
             y = iy * reso + miny
             ug = calc_attractive_potential(x, y, gx, gy)
diff --git a/runtests.sh b/runtests.sh
new file mode 100755
index 00000000..6fae2b70
--- /dev/null
+++ b/runtests.sh
@@ -0,0 +1,2 @@
+echo "Run test suites! "
+python -m unittest discover tests