add test

Author: Tom McCormick

tests/io/test_pyarrow.py

@@ -2638,3 +2638,39 @@ def test_retry_strategy_not_found() -> None:
     io = PyArrowFileIO(properties={S3_RETRY_STRATEGY_IMPL: "pyiceberg.DoesNotExist"})
     with pytest.warns(UserWarning, match="Could not initialize S3 retry strategy: pyiceberg.DoesNotExist"):
         io.new_input("s3://bucket/path/to/file")
+
+def test_parse_location_environment_defaults():
+    """Test that parse_location uses environment variables for defaults."""
+    from pyiceberg.io.pyarrow import PyArrowFileIO
+    import os
+    
+    # Test with default environment (no env vars set)
+    scheme, netloc, path = PyArrowFileIO.parse_location("/foo/bar")
+    assert scheme == "file"
+    assert netloc == ""
+    assert path == "/foo/bar"
+    
+    try:
+        # Test with environment variables set
+        os.environ["DEFAULT_SCHEME"] = "scheme"
+        os.environ["DEFAULT_NETLOC"] = "netloc:8000"
+        
+        scheme, netloc, path = PyArrowFileIO.parse_location("/foo/bar")
+        assert scheme == "scheme"
+        assert netloc == "netloc:8000"
+        assert path == "netloc:8000/foo/bar"
+
+        # Set environment variables
+        os.environ["DEFAULT_SCHEME"] = "hdfs"
+        os.environ["DEFAULT_NETLOC"] = "netloc:8000"
+
+        scheme, netloc, path = PyArrowFileIO.parse_location("/foo/bar")
+        assert scheme == "hdfs"
+        assert netloc == "netloc:8000"
+        assert path == "/foo/bar"
+    finally:
+        # Clean up environment variables
+        if "DEFAULT_SCHEME" in os.environ:
+            del os.environ["DEFAULT_SCHEME"]
+        if "DEFAULT_NETLOC" in os.environ:
+            del os.environ["DEFAULT_NETLOC"]