diff --git a/tests/test_FullChain.py b/tests/test_FullChain.py
index 794451c3..bbf100aa 100644
--- a/tests/test_FullChain.py
+++ b/tests/test_FullChain.py
@@ -17,6 +17,8 @@ def setUpClass(cls):
         downloader = straxen.MongoDownloader(store_files_at=(cls.temp_dir.name,))
         downloader.download_single(test_root_file_name, human_readable_file_name=True)
 
+        assert os.path.exists(os.path.join(cls.temp_dir.name, test_root_file_name))
+
         cls.test_context = fuse.context.full_chain_context(output_folder = cls.temp_dir.name)
         
         cls.test_context.set_config({"path": cls.temp_dir.name,
diff --git a/tests/test_MicroPhysics.py b/tests/test_MicroPhysics.py
index a40853b8..22fa1d58 100644
--- a/tests/test_MicroPhysics.py
+++ b/tests/test_MicroPhysics.py
@@ -17,6 +17,8 @@ def setUpClass(cls):
         downloader = straxen.MongoDownloader(store_files_at=(cls.temp_dir.name,))
         downloader.download_single(test_root_file_name, human_readable_file_name=True)
 
+        assert os.path.exists(os.path.join(cls.temp_dir.name, test_root_file_name))
+
         cls.test_context = fuse.context.microphysics_context(cls.temp_dir.name)
 
         cls.test_context.set_config({"path": cls.temp_dir.name,
diff --git a/tests/test_deterministic_seed.py b/tests/test_deterministic_seed.py
index e7dbde3d..6b9a1777 100644
--- a/tests/test_deterministic_seed.py
+++ b/tests/test_deterministic_seed.py
@@ -1,6 +1,6 @@
+import os
 import unittest
 import tempfile
-import numpy as np
 import fuse
 import straxen
 from numpy.testing import assert_array_equal, assert_raises
@@ -14,8 +14,10 @@ def setUp(self):
         self.temp_dir_0 = tempfile.TemporaryDirectory()
         self.temp_dir_1 = tempfile.TemporaryDirectory()
 
-        downloader = straxen.MongoDownloader(store_files_at=(self.temp_dir_0.name,))
-        downloader.download_single(test_root_file_name, human_readable_file_name=True)
+        for temp_dir in [self.temp_dir_0, self.temp_dir_1]:
+            downloader = straxen.MongoDownloader(store_files_at=(temp_dir.name,))
+            downloader.download_single(test_root_file_name, human_readable_file_name=True)
+            assert os.path.exists(os.path.join(temp_dir.name, test_root_file_name))
 
         self.test_context_0 = fuse.context.full_chain_context(output_folder = self.temp_dir_0.name)