test: add test cases for compress function in utils

Author: titusz

tests/test_utils.py

@@ -1,3 +1,4 @@
+import numpy as np
 import pytest
 import iscc_sci.utils
 
@@ -16,3 +17,11 @@ def test_check_integrity_failure(img_path):
     with pytest.raises(RuntimeError) as exc_info:
         iscc_sci.utils.check_integrity(img_path, wrong_checksum)
     assert "Failed integrity check" in str(exc_info.value)
+
+
+def test_compress():
+    arr1 = np.array([3.0, 15294.7789, 32977.7])
+    arr2 = np.array([3.0, 15294.7789, 32977.7], dtype=np.float32)
+    expected = [3.0, 15294.8, 32977.7]
+    assert iscc_sci.compress(arr1, 1) == expected
+    assert iscc_sci.compress(arr2, 1) == expected