diff --git a/trolldb/tests/conftest.py b/trolldb/tests/conftest.py
index edb8ee7..ffb7312 100644
--- a/trolldb/tests/conftest.py
+++ b/trolldb/tests/conftest.py
@@ -3,7 +3,6 @@
 This module provides fixtures for running a Mongo DB instance in test mode and filling the database with test data.
 """
 
-
 import pytest
 import pytest_asyncio
 
@@ -16,32 +15,22 @@
 
 @pytest.fixture(scope="session")
 def _run_mongodb_server_instance():
-    """Documentation to be added!"""
+    """Encloses all tests (session scope) in a context manager of a running MongoDB instance (in a separate process)."""
     with mongodb_instance_server_process_context():
         yield
 
 
 @pytest.fixture(scope="session")
 def _test_server_fixture(_run_mongodb_server_instance):
-    """Documentation to be added!"""
+    """Encloses all tests (session scope) in a context manager of a running API server (in a separate process)."""
     TestDatabase.prepare()
     with server_process_context(test_app_config, startup_time=2000):
         yield
 
 
-@pytest.fixture(scope="session")
-def _run_mongodb_server_instance():
-    """Runs the MongoDB instance in test mode using a context manager.
-
-    It is run once for all tests in this test suite.
-    """
-    with mongodb_instance_server_process_context():
-        yield
-
-
 @pytest_asyncio.fixture()
 async def mongodb_fixture(_run_mongodb_server_instance):
-    """Fills the database with test data and then runs the mongodb client using a context manager."""
+    """Fills the database with test data and then enclose each test in a mongodb context manager."""
     TestDatabase.prepare()
     async with mongodb_context(test_app_config.database):
         yield