diff --git a/tests/conftest.py b/tests/conftest.py
index 34d2a04..8457976 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,3 +1,6 @@
+import shutil
+from pathlib import Path
+
 import pytest
 
 from pyencrypt.encrypt import encrypt_file, encrypt_key, generate_so_file
@@ -19,21 +22,59 @@ def pytest_configure(config):
     )
 
 
-@pytest.fixture(scope="function")
-def file_and_loader(request, tmp_path_factory):
-    tmp_path = tmp_path_factory.mktemp("file")
+def _common_loader(path, license=False):
+    open("tmp", "a+").write(f"common:path: {path}" + "\n")
+
+    key = generate_aes_key()
+    cipher_key, d, n = encrypt_key(key)
+    loader_path = generate_so_file(cipher_key, d, n, path, license=license)
+
+    work_dir = loader_path.parent
+    work_dir.joinpath("loader.py").unlink()
+    work_dir.joinpath("loader.c").unlink()
+    work_dir.joinpath("loader_origin.py").unlink()
+    return key, loader_path.absolute()
 
-    file_marker = request.node.get_closest_marker("file")
-    file_name = file_marker.kwargs.get("name")
-    function_name = file_marker.kwargs.get("function")
-    code = file_marker.kwargs.get("code")
 
+@pytest.fixture(scope="session")
+def common_loader(tmp_path_factory):
+    open("tmp", "a+").write("make loader" + "\n")
+    tmp_path = tmp_path_factory.mktemp("loader")
+    return _common_loader(tmp_path, False)
+
+
+@pytest.fixture(scope="session")
+def common_loader_with_license(tmp_path_factory):
+    tmp_path = tmp_path_factory.mktemp("loader_with_license")
+    return _common_loader(tmp_path, True)
+
+
+@pytest.fixture(scope="function")
+def file_and_loader(request, common_loader, common_loader_with_license, tmp_path):
     license_marker = request.node.get_closest_marker("license")
     license, kwargs = False, {}
     if license_marker is not None:
         kwargs = license_marker.kwargs
         license = kwargs.pop("enable", True)
 
+    if license:
+        key, loader_path = common_loader_with_license
+    else:
+        key, loader_path = common_loader
+
+    # copy loader -> tmp_path
+    loader_path = (
+        Path(shutil.copytree(loader_path.parent, tmp_path / "encrypted"))
+        / loader_path.name
+    )
+    if license:
+        generate_license_file(key.decode(), loader_path.parent, **kwargs)
+
+    file_marker = request.node.get_closest_marker("file")
+    file_name = file_marker.kwargs.get("name")
+    function_name = file_marker.kwargs.get("function")
+    code = file_marker.kwargs.get("code")
+
     file_path = tmp_path / f"{file_name}.py"
     file_path.touch()
     file_path.write_text(
@@ -45,31 +86,17 @@ def {function_name}():
         ),
         encoding="utf-8",
     )
-    # generate loader.so
-    key = generate_aes_key()
+
     new_path = file_path.with_suffix(".pye")
     encrypt_file(file_path, key.decode(), new_path=new_path)
     file_path.unlink()
-    cipher_key, d, n = encrypt_key(key)
-    loader_path = generate_so_file(cipher_key, d, n, file_path.parent, license=license)
-    work_dir = loader_path.parent
-    work_dir.joinpath("loader.py").unlink()
-    work_dir.joinpath("loader.c").unlink()
-    work_dir.joinpath("loader_origin.py").unlink()
 
-    # License
-    license and generate_license_file(key.decode(), work_dir, **kwargs)
     return (new_path, loader_path)
 
 
 @pytest.fixture(scope="function")
-def package_and_loader(request, tmp_path_factory):
-    pkg_path = tmp_path_factory.mktemp("package")
-
-    file_marker = request.node.get_closest_marker("package")
-    package_name = file_marker.kwargs.get("name")
-    function_name = file_marker.kwargs.get("function")
-    code = file_marker.kwargs.get("code")
+def package_and_loader(request, common_loader, common_loader_with_license, tmp_path):
+    pkg_path = tmp_path
 
     license_marker = request.node.get_closest_marker("license")
     license, kwargs = False, {}
@@ -77,6 +104,25 @@ def package_and_loader(request, tmp_path_factory):
         kwargs = license_marker.kwargs
         license = kwargs.pop("enable", True)
 
+    if license:
+        key, loader_path = common_loader_with_license
+    else:
+        key, loader_path = common_loader
+
+    # copy loader -> tmp_path
+    loader_path = (
+        Path(shutil.copytree(loader_path.parent, tmp_path / "encrypted"))
+        / loader_path.name
+    )
+
+    if license:
+        generate_license_file(key.decode(), loader_path.parent, **kwargs)
+
+    file_marker = request.node.get_closest_marker("package")
+    package_name = file_marker.kwargs.get("name")
+    function_name = file_marker.kwargs.get("function")
+    code = file_marker.kwargs.get("code")
+
     current = pkg_path
     for dir_name in package_name.split(".")[:-1]:
         current = current.joinpath(dir_name)
@@ -95,16 +141,7 @@ def {function_name}():
     )
 
     new_path = file_path.with_suffix(".pye")
-    key = generate_aes_key()
-    encrypt_file(file_path, key, new_path=new_path)
+    encrypt_file(file_path, key.decode(), new_path=new_path)
     file_path.unlink()
 
-    cipher_key, d, n = encrypt_key(key)
-    loader_path = generate_so_file(cipher_key, d, n, pkg_path, license)
-    work_dir = loader_path.parent
-    work_dir.joinpath("loader.py").unlink()
-    work_dir.joinpath("loader.c").unlink()
-    work_dir.joinpath("loader_origin.py").unlink()
-    # License
-    license and generate_license_file(key.decode(), work_dir, **kwargs)
     return pkg_path, loader_path
diff --git a/tests/test_encrypt.py b/tests/test_encrypt.py
index f2dd9ed..6aef4c0 100644
--- a/tests/test_encrypt.py
+++ b/tests/test_encrypt.py
@@ -37,7 +37,7 @@ def test_can_encrypt(path, expected):
     assert can_encrypt(path) == expected
 
 
-class TestGenarateSoFile:
+class TestGenerateSoFile:
     def setup_method(self, method):
         if method.__name__ == "test_generate_so_file_default_path":
             shutil.rmtree(
@@ -53,7 +53,7 @@ def setup_method(self, method):
     )
     def test_generate_so_file(self, key, tmp_path):
         cipher_key, d, n = encrypt_key(key)
-        assert generate_so_file(cipher_key, d, n, tmp_path)
+        assert generate_so_file(cipher_key, d, n, tmp_path).exists()
         assert (tmp_path / "encrypted" / "loader.py").exists() is True
         assert (tmp_path / "encrypted" / "loader_origin.py").exists() is True
         if sys.platform.startswith("win"):
@@ -76,7 +76,7 @@ def test_generate_so_file(self, key, tmp_path):
     )
     def test_generate_so_file_default_path(self, key):
         cipher_key, d, n = encrypt_key(key)
-        assert generate_so_file(cipher_key, d, n)
+        assert generate_so_file(cipher_key, d, n).exists()
         assert (Path(os.getcwd()) / "encrypted" / "loader.py").exists() is True
         assert (Path(os.getcwd()) / "encrypted" / "loader_origin.py").exists() is True
         if sys.platform.startswith("win"):