diff --git a/test/test_adjusters.py b/test/test_adjusters.py
index 1e2220f..e718137 100644
--- a/test/test_adjusters.py
+++ b/test/test_adjusters.py
@@ -3,6 +3,8 @@ import unittest
 import unittest.mock as mock
 import pipeline.adjusters as adjusters
 
+from test.mocks import MockFeature, MockInterval
+
 class TestAdjuster(unittest.TestCase):
     """Test the generic Adjuster class"""
 
@@ -36,7 +38,7 @@ class TestTargetTimeAdjuster(unittest.TestCase):
         tta = adjusters.TargetTimeAdjuster()
         features = []
         for i in range(1, 5):
-            features.append(mock.Mock(duration=i*1.0))
+            features.append(make_feature(duration=i*1.0))
 
         self.assertEqual(tta._features_total_time(features), 10.0)
         self.assertEqual(tta._features_total_time([]), 0.0)
@@ -175,3 +177,106 @@ class TestTargetTimeAdjuster(unittest.TestCase):
                 make_feature(duration=1.0, score=1.0)
             ]
             self.assertEqual(tta._sort_by_score_time(features), [features[2], features[3], features[0], features[1]])
+
+
+    def test_adjust_changes(self):
+        """Test adjusting of list of Features using TTA -- changes to list of Features
+
+        All cases have total time > target time.
+
+        In the cases, specification is Feature(duration, score)
+        Cases:
+         - target = 30.0, margin = 0.0
+           + [(15.0, 1.0), (10.0, 1.0), (12.0, 1.0)] --> [(15.0, 1.0), (12.0, 1.0)] # scores equal, drop smallest
+           + [(15.0, 2.0), (10.0, 2.0), (12.0, 1.0)] --> [(15.0, 1.0), (10.0, 1.0)] # drop lowest scoring (1)
+           + [(15.0, 1.0), (10.0, 1.0), (12.0, 2.0)] --> [(15.0, 1.0), (12.0, 2.0)] # drop lowest scoring (2)
+
+        - target = 30.0, margin = 4.0
+           + [(15.0, 1.0), (10.0, 2.0), (12.0, 1.0)] --> [(15.0, 1.0), (12.0, 1.0)] # not lowest scoring, but within margin
+           + [(16.0, 1.0), (16.0, 1.0), (1.0, 1.0), (1.0, 1.0)] --> [(16.0, 1.0), (16.0, 1.0)] # drop multiple lowest scoring, shortest duration
+
+        """
+        # target 30.0, margin 0.0 cases
+        target, margin = 30.0, 0.0
+
+        with self.subTest(f"target {target} margin {margin}"):
+            with self.subTest("scores equal"):
+                features = [
+                    make_feature(duration=15.0, score=1.0),
+                    make_feature(duration=10.0, score=1.0),
+                    make_feature(duration=12.0, score=1.0)
+                ]
+                tta = adjusters.TargetTimeAdjuster(features=features, target_time=target, margin=margin)
+                expected = [features[0], features[2]]
+                output = tta.adjust()
+                self.assertEqual(len(output), 2)
+                self.assertEqual(output, expected)
+                self.assertEqual(tta.features, expected)
+
+            with self.subTest("drop lowest scoring (1)"):
+                features = [
+                    make_feature(duration=15.0, score=2.0),
+                    make_feature(duration=10.0, score=2.0),
+                    make_feature(duration=12.0, score=1.0)
+                ]
+                tta = adjusters.TargetTimeAdjuster(features=features, target_time=target, margin=margin)
+                expected = [features[0], features[1]]
+                output = tta.adjust()
+                self.assertEqual(len(output), 2)
+                self.assertEqual(output, expected)
+                self.assertEqual(tta.features, expected)
+
+            with self.subTest("drop lowest scoring (2)"):
+                features = [
+                    make_feature(duration=15.0, score=1.0),
+                    make_feature(duration=10.0, score=1.0),
+                    make_feature(duration=12.0, score=2.0)
+                ]
+                tta = adjusters.TargetTimeAdjuster(features=features, target_time=target, margin=margin)
+                expected = [features[0], features[2]]
+                output = tta.adjust()
+                self.assertEqual(len(output), 2)
+                self.assertEqual(output, expected)
+                self.assertEqual(tta.features, expected)
+
+        # target 30.0, margin 4.0 cases
+        target, margin, strategy = 30.0, 4.0, adjusters.TargetTimeAdjuster._STRATEGY.ABSOLUTE
+
+        with self.subTest(f"target {target} margin {margin}"):
+            with self.subTest("not lowest scoring, but within margin"):
+                # explanation: dropping the 10.0 feature would put us at 27.0, which is within the margin (26.0, 34.0)
+                features = [
+                    make_feature(duration=15.0, score=1.0),
+                    make_feature(duration=10.0, score=2.0),
+                    make_feature(duration=12.0, score=1.0)
+                ]
+                tta = adjusters.TargetTimeAdjuster(features=features, target_time=target,
+                                                   margin=margin, strategy=strategy)
+                expected = [features[0], features[2]]
+                output = tta.adjust()
+                self.assertEqual(len(output), 2)
+                self.assertEqual(output, expected)
+                self.assertEqual(tta.features, expected)
+
+            with self.subTest("drop multiple lowest scoring, shortest duration"):
+                # explanation: dropping the 1.0 features would put us at 32.0, which is within the margin (26.0, 34.0)
+                features = [
+                    make_feature(duration=16.0, score=1.0),
+                    make_feature(duration=16.0, score=1.0),
+                    make_feature(duration=1.0, score=1.0),
+                    make_feature(duration=1.0, score=1.0),
+                    make_feature(duration=1.0, score=1.0),
+                    make_feature(duration=1.0, score=1.0)
+                ]
+                tta = adjusters.TargetTimeAdjuster(features=features, target_time=target,
+                                                   margin=margin, strategy=strategy)
+                expected = [features[0], features[1], features[2], features[3]]
+                output = tta.adjust()
+                self.assertEqual(len(output), 4)
+                self.assertEqual(output, expected)
+                self.assertEqual(tta.features, expected)
+
+
+def make_feature(duration, score=1.0):
+    """Helper function to create a MockFeature from duration and score"""
+    return MockFeature(interval=MockInterval.from_duration(duration), score=score)