After reapplying chunking sz3 works properly again. Adding some tests.

tests/test_sz3.py

+from utils import wrapper, TestClass
+import pytest
+folders = None
+import hdf5plugin
+hdf5plugin.register(force=True)
+
+
+class TestSZ3(TestClass):
+    def test_compress_sz3_abs(self):
+        compression = "lossy,sz3,abs,0.01"
+        wrapper(self, compression=compression)
+
+    def test_compress_sz3_rel(self):
+        compression = "lossy,sz3,rel,0.001"
+        wrapper(self, compression=compression)
+
+    def test_sz3_analyzer(self):
+        from enstools.compression.api import analyze_files
+        # Check that the compression without specifying compression parameters works
+        datasets = ["dataset_%iD.nc" % dimension for dimension in range(1, 4)]
+        for ds in datasets:
+            input_path = self.input_directory_path / ds
+            analyze_files(file_paths=input_path, compressor="sz3")
+