Fix python 2 tests

pygal/test/test_config.py

@@ -211,12 +211,12 @@ def test_logarithmic_big_scale():
 
 
 def test_value_formatter():
-    line = Line(value_formatter=lambda x: str(x) + '‰')
+    line = Line(value_formatter=lambda x: str(x) + u('‰'))
     line.add('_', [10 ** 4, 10 ** 5, 23 * 10 ** 4])
     q = line.render_pyquery()
     assert len(q(".y.axis .guides")) == 11
     assert q(".axis.y text").map(texts) == list(map(
-        lambda x: str(x) + '‰', map(float, range(20000, 240000, 20000))))
+        lambda x: str(x) + u('‰'), map(float, range(20000, 240000, 20000))))
 
 
 def test_logarithmic_small_scale():