add test file for reading sav file handle

Author: slobodan-ilic

tests/test_file_handle.py

@@ -0,0 +1,54 @@
+"""
+Test file handle support
+
+Tests reading statistical data files from file-like objects (e.g., zip archives)
+without extracting them to disk.
+"""
+
+import os
+import zipfile
+import tempfile
+import pyreadstat
+
+
+script_folder = os.path.dirname(os.path.realpath(__file__))
+parent_folder = os.path.split(script_folder)[0]
+data_folder = os.path.join(parent_folder, "test_data", "multiple_response")
+
+
+def test_read_sav_from_zip_file_handle():
+    """
+    Test reading SAV file directly from zip archive without extraction.
+
+    This tests the main use case: reading large files from zip archives
+    without needing to extract them to temporary disk storage.
+    """
+    test_file = os.path.join(data_folder, "simple_alltypes.sav")
+
+    with tempfile.NamedTemporaryFile(suffix=".zip") as tmp:
+        # Create zip archive with test file
+        with zipfile.ZipFile(tmp.name, "w", zipfile.ZIP_DEFLATED) as zf:
+            zf.write(test_file, "simple_alltypes.sav")
+
+        # Read from zip without extraction
+        with zipfile.ZipFile(tmp.name, "r") as zf:
+            with zf.open("simple_alltypes.sav", "r") as file_handle:
+                df, meta = pyreadstat.read_sav(file_handle)
+
+                expected_columns = [
+                    "x",
+                    "y",
+                    "z",
+                    "str",
+                    "bool1",
+                    "bool2",
+                    "bool3",
+                    "ca_subvar_1",
+                    "ca_subvar_2",
+                    "ca_subvar_3",
+                    "date",
+                    "quarter",
+                ]
+
+                assert len(df) == 6
+                assert list(df.columns) == expected_columns