diff --git a/platform_plugin_aspects/signals.py b/platform_plugin_aspects/signals.py
index 182358b..26bad3f 100644
--- a/platform_plugin_aspects/signals.py
+++ b/platform_plugin_aspects/signals.py
@@ -39,7 +39,7 @@ def receive_course_enrollment_changed(  # pylint: disable=unused-argument  # pra
     sender, **kwargs
 ):
     """
-    Receives ENROLL_STATUS_CHANGE
+    Receives ENROLL_STATUS_CHANGE signal and queues the dump job.
     """
     from platform_plugin_aspects.tasks import (  # pylint: disable=import-outside-toplevel
         dump_data_to_clickhouse,
diff --git a/platform_plugin_aspects/sinks/base_sink.py b/platform_plugin_aspects/sinks/base_sink.py
index 38008f0..7e80ea2 100644
--- a/platform_plugin_aspects/sinks/base_sink.py
+++ b/platform_plugin_aspects/sinks/base_sink.py
@@ -271,7 +271,7 @@ def send_item(self, serialized_item, many=False):
                 writer.writerow(node.values())
         else:
             writer.writerow(serialized_item.values())
-        print("ClickHouse CSV output", output.getvalue().encode("utf-8"))
+
         request = requests.Request(
             "POST",
             self.ch_url,
diff --git a/platform_plugin_aspects/sinks/tests/test_course_enrollment_sink.py b/platform_plugin_aspects/sinks/tests/test_course_enrollment_sink.py
new file mode 100644
index 0000000..513186f
--- /dev/null
+++ b/platform_plugin_aspects/sinks/tests/test_course_enrollment_sink.py
@@ -0,0 +1,20 @@
+"""
+Test the course enrollment sink module.
+"""
+
+from unittest.mock import patch
+
+from platform_plugin_aspects.sinks import CourseEnrollmentSink
+
+
+@patch("platform_plugin_aspects.sinks.ModelBaseSink.get_queryset")
+def test_get_queryset(mock_get_queryset):
+    """
+    Test the get_queryset method.
+    """
+    sink = CourseEnrollmentSink(None, None)
+
+    sink.get_queryset()
+
+    mock_get_queryset.assert_called_once_with(None)
+    mock_get_queryset.return_value.select_related.assert_called_once_with("user")
diff --git a/platform_plugin_aspects/sinks/tests/test_external_id_sink.py b/platform_plugin_aspects/sinks/tests/test_external_id_sink.py
index 6ee1b83..4a516a9 100644
--- a/platform_plugin_aspects/sinks/tests/test_external_id_sink.py
+++ b/platform_plugin_aspects/sinks/tests/test_external_id_sink.py
@@ -17,6 +17,4 @@ def test_get_queryset(mock_get_queryset):
     sink.get_queryset()
 
     mock_get_queryset.assert_called_once_with(None)
-    mock_get_queryset.return_value.select_related.assert_called_once_with(
-        "user", "external_id_type"
-    )
+    mock_get_queryset.return_value.select_related.assert_called_once_with("user")