style: fix linting issues in test files

Apply automatic formatting fixes:
- Remove whitespace from blank lines in test_converter.py
- Fix quote consistency and formatting in test files
- Ensure all files pass ruff and mypy checks

All linting checks now pass:
✅ ruff check
✅ ruff format --check
✅ mypy

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: laughingman7743

tests/pyathena/sqlalchemy/test_base.py

@@ -277,6 +277,7 @@ def test_reflect_select(self, engine):
         assert isinstance(one_row_complex.c.col_map.type, types.String)
         # With struct support, col_struct should now be recognized as AthenaStruct
         from pyathena.sqlalchemy.types import AthenaStruct
+
         assert isinstance(one_row_complex.c.col_struct.type, AthenaStruct)
         assert isinstance(
             one_row_complex.c.col_decimal.type,
@@ -325,6 +326,7 @@ def test_get_column_type(self, engine):
         assert isinstance(dialect._get_column_type("map<int, int>"), types.String)
         # With struct support, struct types should be recognized as AthenaStruct
         from pyathena.sqlalchemy.types import AthenaStruct
+
         assert isinstance(dialect._get_column_type("struct<a: int, b: int>"), AthenaStruct)
         assert isinstance(dialect._get_column_type("row<name: string, age: int>"), AthenaStruct)
         decimal_with_args = dialect._get_column_type("decimal(10,1)")

tests/pyathena/sqlalchemy/test_compiler.py

@@ -35,7 +35,7 @@ def test_visit_struct_uppercase(self):
     def test_visit_struct_no_fields_attribute(self):
         # Test struct type without fields attribute
         compiler = AthenaTypeCompiler()
-        struct_type = type('MockStruct', (), {})()
+        struct_type = type("MockStruct", (), {})()
         result = compiler.visit_struct(struct_type)
         assert result == "ROW()"
 

tests/pyathena/test_converter.py

@@ -35,15 +35,15 @@ def test_to_struct_empty_string():
 
 def test_to_struct_non_dict_json():
     # Arrays and other non-dict JSON should return None
-    array_json = '[1, 2, 3]'
+    array_json = "[1, 2, 3]"
     result = _to_struct(array_json)
     assert result is None
-    
+
     string_json = '"just a string"'
     result = _to_struct(string_json)
     assert result is None
-    
-    number_json = '42'
+
+    number_json = "42"
     result = _to_struct(number_json)
     assert result is None