diff --git a/test/test_feature_extractors.py b/test/test_feature_extractors.py
index ab34005..f8de329 100644
--- a/test/test_feature_extractors.py
+++ b/test/test_feature_extractors.py
@@ -10,6 +10,7 @@ import pytest
 import pipeline.feature_extractors as extractors
 
 from pipeline.utils import Source, SourceMedia # technically makes this an integration test, but...
+from test.mocks import MockFeature, MockInterval
 
 class TestSource():
     """Provide utils.Source for testing"""
@@ -265,6 +266,21 @@ class TestLoudAudioFeatureExtractor(unittest.TestCase):
             for feature in test_extractor.features:
                 self.assertGreaterEqual(feature.interval.duration, min_duration)
 
+        # test trim_overlap
+        with self.subTest("trim_overlap"):
+            test_extractor = extractors.LoudAudioFeatureExtractor(input_files=video_source,
+                                                                  min_duration=0,
+                                                                  num_features=10)
+
+            feature1 = MockFeature(interval=MockInterval(start=25, end=75))
+            # mock feature1's interval .overlaps() method to always return True
+            feature1.interval.overlaps = lambda x: True
+            feature2 = MockFeature(interval=MockInterval(start=50, end=100)) # overlap
+            feature2.interval.overlaps = lambda x: True
+            features = [feature1, feature2]
+            keep_features = test_extractor._keep_num(features,num=5, trim_overlap=True)
+            self.assertEqual(len(keep_features), 1)
+
     # TODO: add sample video with loud audio to test _loudnessdetect()
 
 class TestVideoActivityFeatureExtractor(unittest.TestCase):