fix: add type annotations and apply formatting to version tests

Author: NITHIVARSHA T P

tests/test_version.py

@@ -1,26 +1,25 @@
 """Tests for zarr._version module"""
-import pytest
-import importlib
-import sys
 
 
-def test_version_is_available():
+def test_version_is_available() -> None:
     """Test that __version__ is available and is a string."""
     from zarr import __version__
+
     assert __version__ is not None
     assert isinstance(__version__, str)
     assert len(__version__) > 0
 
 
-def test_version_format():
+def test_version_format() -> None:
     """Test that version follows basic format."""
     from zarr import __version__
+
     assert isinstance(__version__, str)
     # Basic check: should contain a dot or dash
-    assert '.' in __version__ or '-' in __version__
+    assert "." in __version__ or "-" in __version__
 
 
-def test_version_is_not_unknown_in_normal_case():
+def test_version_is_not_unknown_in_normal_case() -> None:
     from zarr import __version__
-    assert __version__ != "unknown"
 
+    assert __version__ != "unknown"