use django 3&4

Signed-off-by: Frost Ming <[email protected]>

tests/test_integration.py

@@ -1,12 +1,11 @@
+import shutil
 import sys
 import textwrap
+from pathlib import Path
 
-import py
 import pytest
-from tox import __version__ as TOX_VERSION
 
-FIX_PROJECT = py.path.local(__file__).dirpath("fixture-project")
-IS_TOX_4 = TOX_VERSION[0] == "4"
+FIX_PROJECT = Path(__file__).with_name("fixture-project")
 
 
 @pytest.fixture(autouse=True)
@@ -18,25 +17,20 @@ def clean_env(monkeypatch):
 
 def setup_project(tmpdir, tox_config):
     for filename in ("demo.py", "pdm.lock", "pyproject.toml"):
-        FIX_PROJECT.join(filename).copy(tmpdir.join(filename))
+        shutil.copy(FIX_PROJECT / filename, tmpdir)
     with tmpdir.join("tox.ini").open("w", ensure=True) as f:
         f.write(tox_config)
     with tmpdir.join(".pdm.toml").open("w", ensure=True) as f:
         f.write(
             """[python]
 path = "{}"
-""".format(
-                sys.executable.replace("\\", "/")
-            )
+""".format(sys.executable.replace("\\", "/"))
         )
 
 
 def execute_config(tmpdir, config: str):
     __tracebackhide__ = True
-    if IS_TOX_4:
-        from tox.run import run as main
-    else:
-        from tox.session import main
+    from tox.run import run as main
 
     setup_project(tmpdir, textwrap.dedent(config))
 
@@ -50,10 +44,7 @@ def execute_config(tmpdir, config: str):
     if code != 0:
         pytest.fail(f"non-zero exit code: {code}")
 
-    if TOX_VERSION[0] == "4":
-        package = tmpdir.join(".tox/.pkg/dist/demo-0.1.0.tar.gz")
-    else:
-        package = tmpdir.join(".tox/dist/demo-0.1.0.tar.gz")
+    package = tmpdir.join(".tox/.pkg/dist/demo-0.1.0.tar.gz")
     assert package.exists()
 
 
@@ -62,16 +53,16 @@ def test_install_conditional_deps(tmpdir):
         tmpdir,
         """
         [tox]
-        envlist = django{2,3}
+        envlist = django{3,4}
         passenv = LD_PRELOAD
         isolated_build = True
 
         [testenv]
         groups =
             lint
         deps =
-            django2: Django~=2.0
-            django3: Django~=3.0
+            django2: Django~=3.0
+            django3: Django~=4.0
         commands =
             django-admin --version
             flake8 --version