diff --git a/Makefile b/Makefile
index 514978035d9856f53f6cf695d5dc4534a9008054..267bef13a1731b10d03b1baf2710f31c32e1ea8d 100644
--- a/Makefile
+++ b/Makefile
@@ -53,8 +53,15 @@ clean-test: ## remove test and coverage artifacts
 lint: ## check style with flake8
 	flake8 flatland tests
 
+test:	export DISPLAY = :0
 test: ## run tests quickly with the default Python
-	export DISPLAY=:0.0
+	echo "$$DISPLAY"
+	py.test
+
+
+jw: 	export DISPLAY = :0.0
+jw:
+	echo "$$DISPLAY"
 	py.test
 
 test-all: ## run tests on every Python version with tox
diff --git a/flatland/utils/graphics_pil.py b/flatland/utils/graphics_pil.py
index ceda3fd9f4c7d16b8a516dca8af43ea3122d51c7..b66c8dc55f38c321d038306f933de66493a6e6b3 100644
--- a/flatland/utils/graphics_pil.py
+++ b/flatland/utils/graphics_pil.py
@@ -86,7 +86,7 @@ class PILGL(GraphicsLayer):
     def create_layer(self, iLayer=0):
         if len(self.layers) <= iLayer:
             for i in range(len(self.layers), iLayer+1):
-                if i==0:
+                if i == 0:
                     opacity = 255  # "bottom" layer is opaque (for rails)
                 else:
                     opacity = 0   # subsequent layers are transparent
diff --git a/tox.ini b/tox.ini
index 5a97b7e1c5b2f09db2cca8da5e1cf9db002f26f1..7b8636e68123bf70238a2e8c706aab05036d85d2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -28,6 +28,7 @@ commands = make coverage
 [testenv]
 setenv =
     PYTHONPATH = {toxinidir}
+    DISPLAY = :0
 deps =
     -r{toxinidir}/requirements_dev.txt
 ; If you want to make tox run the tests with the same versions, create a