added test_open_to_numpy_mem_leaks

tests/leaks_test.py

@@ -10,6 +10,7 @@
 import pillow_heif
 
 pytest.importorskip("pympler", reason="`pympler` not installed")
+pytest.importorskip("numpy", reason="`numpy` not installed")
 
 print(pillow_heif.libheif_info())
 
@@ -72,3 +73,23 @@ def test_open_save_leaks(ctx_in_memory):
             mem_limit = mem + 1
             continue
         assert mem <= mem_limit, f"memory usage limit exceeded after {i + 1} iterations"
+
+
+def perform_open_to_numpy(iterations, image_path):
+    import numpy as np
+
+    for _ in range(iterations):
+        heif_file = pillow_heif.open_heif(image_path)
+        _array = np.asarray(heif_file[0])  # noqa
+
+
+def test_open_to_numpy_mem_leaks():
+    mem_limit = None
+    for i in range(1000):
+        perform_open_to_numpy(1, Path("images/rgb8_512_512_1_0.heic"))
+        gc.collect()
+        mem = _get_mem_usage()
+        if i < 300:
+            mem_limit = mem + 1
+            continue
+        assert mem <= mem_limit, f"memory usage limit exceeded after {i + 1} iterations"