cropping summaries

tests/test_crop_exercise_bottoms_command.py

@@ -49,6 +49,8 @@ class CropExerciseBottomsCommandTests(unittest.TestCase):
                 0,
             )
         self.assertIn("1 PDF remplacé", log.getvalue())
+        self.assertIn("1 exercice(s) rogné(s)", log.getvalue())
+        self.assertIn("Rognage moyen des exercices modifiés", log.getvalue())
         with pymupdf.open(self.large) as cropped:
             self.assertLess(cropped[0].rect.height, 250)
         self.assertEqual(self.short.read_bytes(), self.short_original)
@@ -68,6 +70,37 @@ class CropExerciseBottomsCommandTests(unittest.TestCase):
         )
         self.assertTrue((backups[0].parents[2] / "report.json").is_file())
 
+    def test_crop_statistics_average_percentages_by_exercise(self):
+        records = [
+            {
+                "file": "Copies/Copie01/Ex 1.pdf",
+                "height_lines": 10.0,
+                "bottom_removed_lines": 4.0,
+                "status": "cropped",
+            },
+            {
+                "file": "Copies/Copie01/Ex 1.pdf",
+                "height_lines": 10.0,
+                "bottom_removed_lines": 0.0,
+                "status": "skipped-short",
+            },
+            {
+                "file": "Copies/Copie01/Ex 2.pdf",
+                "height_lines": 10.0,
+                "bottom_removed_lines": 5.0,
+                "status": "cropped",
+            },
+            {
+                "file": "Copies/Copie01/Ex 3.pdf",
+                "height_lines": 10.0,
+                "bottom_removed_lines": 0.0,
+                "status": "unchanged-small-crop",
+            },
+        ]
+        count, average = crop_exercise_bottoms.crop_statistics(records)
+        self.assertEqual(count, 2)
+        self.assertAlmostEqual(average, 35.0)
+
     def test_detection_failure_does_not_publish_an_earlier_result(self):
         broken = self.answers / "Ex 3.pdf"
         broken.write_bytes(b"not a PDF")