diff --git a/swh/indexer/tests/test_language.py b/swh/indexer/tests/test_language.py
--- a/swh/indexer/tests/test_language.py
+++ b/swh/indexer/tests/test_language.py
@@ -19,7 +19,6 @@
     """
     def prepare(self):
         self.config = {
-            'destination_task': None,
             'tools':  {
                 'name': 'pygments',
                 'version': '2.0.1+dfsg-1.1+deb8u1',
@@ -33,7 +32,6 @@
         self.idx_storage = BasicMockIndexerStorage()
         self.log = logging.getLogger('swh.indexer')
         self.objstorage = MockObjStorage()
-        self.destination_task = None
         self.tool_config = self.config['tools']['configuration']
         self.max_content_size = self.tool_config['max_content_size']
         self.tools = self.register_tools(self.config['tools'])
diff --git a/swh/indexer/tests/test_metadata.py b/swh/indexer/tests/test_metadata.py
--- a/swh/indexer/tests/test_metadata.py
+++ b/swh/indexer/tests/test_metadata.py
@@ -23,7 +23,6 @@
         self.idx_storage = MockIndexerStorage()
         self.log = logging.getLogger('swh.indexer')
         self.objstorage = MockObjStorage()
-        self.destination_task = None
         self.tools = self.register_tools(self.config['tools'])
         self.tool = self.tools[0]
         self.results = []
@@ -57,7 +56,6 @@
         self.idx_storage = MockIndexerStorage()
         self.log = logging.getLogger('swh.indexer')
         self.objstorage = MockObjStorage()
-        self.destination_task = None
         self.tools = self.register_tools(self.config['tools'])
         self.tool = self.tools[0]
         self.results = []
@@ -339,7 +337,7 @@
             "contIntegration": "https://travis-ci.org/codemeta/codemeta",
             "developmentStatus": "active",
             "downloadUrl": "https://github.com/codemeta/codemeta/archive/2.0.zip",
-            "funder": { 
+            "funder": {
                 "@id": "https://doi.org/10.13039/100000001",
                 "@type": "Organization",
                 "name": "National Science Foundation"
diff --git a/swh/indexer/tests/test_origin_metadata.py b/swh/indexer/tests/test_origin_metadata.py
--- a/swh/indexer/tests/test_origin_metadata.py
+++ b/swh/indexer/tests/test_origin_metadata.py
@@ -36,7 +36,6 @@
         self.idx_storage = MockIndexerStorage()
         self.log = logging.getLogger('swh.indexer')
         self.objstorage = MockObjStorage()
-        self.destination_task = None
         self.tools = self.register_tools(self.config['tools'])
         self.tool = self.tools[0]
         self.results = []