Add test to demonstrate local schema validation

Author: medley56

space_packet_parser/xtce/validation.py

@@ -170,7 +170,7 @@ def _is_http_url(s):
     # Fix and parse the schema content
     try:
         try:
-            schema_root_element = ElementTree.XML(schema_content, parser)
+            schema_root_element = ElementTree.XML(schema_content.encode("utf-8"), parser)
             return ElementTree.XMLSchema(schema_root_element), schema_root_element.get("version", "unknown")
         except ElementTree.XMLSchemaError as e:
             # Try to fix known issues

tests/unit/test_xtce/test_validation.py

@@ -348,3 +348,22 @@ def test_validate_xtce_all_mode(test_data_dir):
     # Should have schema information
     assert result.schema_location is not None
     assert result.schema_version is not None
+
+
+def test_schema_validation_with_local_xsd(test_data_dir):
+    """Test schema validation using a local XSD file instead of downloading from URL"""
+    # Use an existing test XTCE document
+    xtce_path = test_data_dir / "test_xtce.xml"
+    local_xsd_path = test_data_dir / "SpaceSystem.xsd"
+
+    # Validate using the local XSD
+    result = validate_xtce(xtce_path, level="schema", local_xsd=local_xsd_path)
+
+    # Verify validation was performed
+    assert result.validation_level.value == "schema"
+    assert result.schema_location == str(local_xsd_path)
+    assert result.schema_version is not None
+
+    # The document should be valid against the schema
+    assert result.valid
+    assert len(result.errors) == 0