diff --git a/tests/mocks.py b/tests/mocks.py
index bfd699d7a..7a312350f 100644
--- a/tests/mocks.py
+++ b/tests/mocks.py
@@ -495,6 +495,7 @@ create_stream_sd_file = {
 
 
 def mock_conf_settings(obj, settings={}):
+    conf.settings = None
     settings.setdefault('download_mirrors', [])
     conf.initialize_settings(False)
     original_settings = conf.settings
diff --git a/tests/unit/core/test_BlobManager.py b/tests/unit/core/test_BlobManager.py
index 327fd7f42..f39edaadb 100644
--- a/tests/unit/core/test_BlobManager.py
+++ b/tests/unit/core/test_BlobManager.py
@@ -106,7 +106,11 @@ class BlobManagerTest(unittest.TestCase):
 
         # open the last blob
         blob = yield self.bm.get_blob(blob_hashes[-1])
-        yield blob.open_for_writing(self.peer)
+        w, finished_d = yield blob.open_for_writing(self.peer)
+
+        # schedule a close, just to leave the reactor clean
+        finished_d.addBoth(lambda x:None)
+        self.addCleanup(w.close)
 
         # delete the last blob and check if it still exists
         yield self.bm.delete_blobs([blob_hash])
diff --git a/tests/unit/core/test_HashBlob.py b/tests/unit/core/test_HashBlob.py
index c8b595a80..157be38a2 100644
--- a/tests/unit/core/test_HashBlob.py
+++ b/tests/unit/core/test_HashBlob.py
@@ -154,3 +154,8 @@ class BlobFileTest(unittest.TestCase):
         # second write should fail to save
         yield self.assertFailure(blob_file.save_verified_blob(writer_2), DownloadCanceledError)
 
+        # schedule a close, just to leave the reactor clean
+        finished_d_1.addBoth(lambda x:None)
+        finished_d_2.addBoth(lambda x:None)
+        self.addCleanup(writer_1.close)
+        self.addCleanup(writer_2.close)
diff --git a/tests/unit/dht/test_hash_announcer.py b/tests/unit/dht/test_hash_announcer.py
index 78ddc7eb5..5b6d954a0 100644
--- a/tests/unit/dht/test_hash_announcer.py
+++ b/tests/unit/dht/test_hash_announcer.py
@@ -4,6 +4,7 @@ from lbrynet import conf
 from lbrynet.core import utils
 from lbrynet.dht.hashannouncer import DHTHashAnnouncer
 from tests.util import random_lbry_hash
+from tests.mocks import mock_conf_settings
 
 
 class MocDHTNode(object):
@@ -38,7 +39,7 @@ class MocStorage(object):
 class DHTHashAnnouncerTest(unittest.TestCase):
 
     def setUp(self):
-        conf.initialize_settings(False)
+        mock_conf_settings(self)
         self.num_blobs = 10
         self.blobs_to_announce = []
         for i in range(0, self.num_blobs):