remove pep8 validation errors

test/test_cache.py

@@ -1,5 +1,7 @@
 # coding: utf-8
-import autopath
+from autopath import do_autopath
+do_autopath()
+
 from tiramisu import setting
 setting.expires_time = 1
 from tiramisu.option import IntOption, OptionDescription
@@ -20,9 +22,10 @@ def make_description():
 
 def test_cache_config():
     od1 = make_description()
-    assert od1.impl_already_build_caches() == False
+    assert od1.impl_already_build_caches() is False
     c = Config(od1)
-    assert od1.impl_already_build_caches() == True
+    assert od1.impl_already_build_caches() is True
+    c
 
 
 def test_cache():