move code generation tests to utils' tests

tests/unit/utils/test_code_generation.py

@@ -1,5 +1,4 @@
-import os
-
+from pathlib import Path
 from solc_select import solc_select
 
 from slither import Slither
@@ -7,17 +6,16 @@ from slither.utils.code_generation import (
     generate_interface,
 )
 
-SLITHER_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-CODE_TEST_ROOT = os.path.join(SLITHER_ROOT, "tests", "code_generation")
+TEST_DATA_DIR = Path(__file__).resolve().parent / "test_data" / "code_generation"
 
 
 def test_interface_generation() -> None:
     solc_select.switch_global_version("0.8.4", always_install=True)
 
-    sl = Slither(os.path.join(CODE_TEST_ROOT, "CodeGeneration.sol"))
+    sl = Slither(Path(TEST_DATA_DIR, "CodeGeneration.sol").as_posix())
 
     actual = generate_interface(sl.get_contract_from_name("TestContract")[0])
-    expected_path = os.path.join(CODE_TEST_ROOT, "TEST_generated_code.sol")
+    expected_path = Path(TEST_DATA_DIR, "TEST_generated_code.sol").as_posix()
 
     with open(expected_path, "r", encoding="utf-8") as file:
         expected = file.read()