test full path for stylesheets

I'm going to be screwing around with this code in some future commits so
it's better to be explicit

tests/functional_tests.py

@@ -190,15 +190,15 @@ def test_setting_selected_style_includes_cookie(client):
     response = client.get('/?style=light')
     style_cookie = next((cookie for cookie in client.cookie_jar if cookie.name == 'user-style'), None)
     assert response.status_code == 200
-    assert b'light.css' in response.data
-    assert b'dark.css' not in response.data
+    assert b'/static/css/light.css' in response.data
+    assert b'/static/css/dark.css' not in response.data
     assert style_cookie.value == 'light'
 
     response = client.get('/?style=dark')
     style_cookie = next((cookie for cookie in client.cookie_jar if cookie.name == 'user-style'), None)
     assert response.status_code == 200
-    assert b'dark.css' in response.data
-    assert b'light.css' not in response.data
+    assert b'/static/css/dark.css' in response.data
+    assert b'/static/css/light.css' not in response.data
     assert style_cookie.value == 'dark'
 
 

tests/test_pages.py

@@ -49,22 +49,22 @@ def test_render_with_user_dark_theme(app):
     """Test that a request with the dark theme selected renders the dark theme."""
     cookie = dump_cookie("user-style", 'dark')
     with app.test_request_context(headers={'COOKIE': cookie}):
-        assert b'dark.css' in render('base.html').data
-        assert b'light.css' not in render('base.html').data
+        assert b'/static/css/dark.css' in render('base.html').data
+        assert b'/static/css/light.css' not in render('base.html').data
 
 
 def test_render_with_user_light_theme(app):
     """Test that a request with the light theme selected renders the light theme."""
     with app.test_request_context():
-        assert b'light.css' in render('base.html').data
-        assert b'dark.css' not in render('base.html').data
+        assert b'/static/css/light.css' in render('base.html').data
+        assert b'/static/css/dark.css' not in render('base.html').data
 
 
 def test_render_with_no_user_theme(app):
     """Test that a request with no theme set renders the light theme."""
     with app.test_request_context():
-        assert b'light.css' in render('base.html').data
-        assert b'dark.css' not in render('base.html').data
+        assert b'/static/css/light.css' in render('base.html').data
+        assert b'/static/css/dark.css' not in render('base.html').data
 
 
 def test_request_path_to_instance_resource_path(app):