Melhora dos tests para evitar request ao balaio

[doubles.py]
- adiciono uma classe double, pra simular que o balaio esta offline

[tests_pages.py]
- nos tests que fazem get do notice_detail, aonde é invocada a
BalaioAPI, faço um replace com o novo double:
``doubles.BalaioAPIDoubleDisabled`` para simular o balaio offline

scielomanager/articletrack/tests/doubles.py

@@ -39,3 +39,11 @@ def list_files_members_by_attempt(self, attempt_id):
     def get_xml_uri(self, attempt_id, target_name):
         tests_xmls_dirs = path.abspath(path.join(path.dirname(__file__), 'xml_tests_files'))
         return "file://%s" % path.join(tests_xmls_dirs, "valid.xml")
+
+
+class BalaioAPIDoubleDisabled(BalaioAPI):
+    def is_up(self):
+        return False
+
+    def list_files_members_by_attempt(self, attempt_id):
+        raise ValueError

scielomanager/articletrack/tests/tests_pages.py

@@ -27,7 +27,7 @@ def _makePermission(perm, model, app_label='articletrack'):
     return auth_models.Permission.objects.get(codename=perm, content_type=ct)
 
 
-class CheckinListTests(WebTest):
+class CheckinListTests(WebTest, mocker.MockerTestCase):
 
     def setUp(self):
         self.user = auth.UserF(is_active=True)
@@ -186,6 +186,12 @@ def test_status_code_notice_list(self):
         self._addWaffleFlag()
         notice = self._makeOne()
 
+        # to avoid making a request will replace it with a double
+        balaio = self.mocker.replace('articletrack.balaio.BalaioAPI')
+        balaio()
+        self.mocker.result(doubles.BalaioAPIDoubleDisabled())
+        self.mocker.replay()
+
         response = self.app.get(reverse('notice_detail',
                                         args=[notice.checkin.pk]), user=self.user)
 
@@ -203,6 +209,12 @@ def test_notice_list_with_itens(self):
         self._addWaffleFlag()
         notice = self._makeOne()
 
+        # to avoid making a request will replace it with a double
+        balaio = self.mocker.replace('articletrack.balaio.BalaioAPI')
+        balaio()
+        self.mocker.result(doubles.BalaioAPIDoubleDisabled())
+        self.mocker.replay()
+
         response = self.app.get(reverse('notice_detail',
                                         args=[notice.checkin.pk]), user=self.user)
 
@@ -212,6 +224,12 @@ def test_notice_list_must_have_link_to_checkin_list(self):
         self._addWaffleFlag()
         notice = self._makeOne()
 
+        # to avoid making a request will replace it with a double
+        balaio = self.mocker.replace('articletrack.balaio.BalaioAPI')
+        balaio()
+        self.mocker.result(doubles.BalaioAPIDoubleDisabled())
+        self.mocker.replay()
+
         response = self.app.get(reverse('notice_detail',
                                         args=[notice.checkin.pk]), user=self.user)