fix: support uv 0.10.0 (#1055)

* fix: support uv 0.10.0

Signed-off-by: Henry Schreiner <henryfs@princeton.edu>

* tests: test for --clear

Signed-off-by: Henry Schreiner <henryfs@princeton.edu>

---------

Signed-off-by: Henry Schreiner <henryfs@princeton.edu>

Author: henryiii

nox/virtualenv.py

@@ -802,6 +802,8 @@ def create(self) -> bool:
                 self._resolved_interpreter if self.interpreter else sys.executable,
                 self.location,
             ]
+            if version.Version("0.8") <= UV_VERSION:
+                cmd += ["--clear"]
         else:
             cmd = [self._resolved_interpreter, "-m", "venv", self.location]
         cmd.extend(self.venv_params)

tests/test_virtualenv.py

@@ -283,6 +283,36 @@ def test_condaenv_detection(make_conda: Callable[..., tuple[CondaEnv, Path]]) ->
     assert dir_.samefile(output_match.group("env_dir"))
 
 
+def test_create_args_new_uv(
+    make_one: Callable[..., tuple[VirtualEnv, Path]],
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    run_mock = mock.Mock()
+    monkeypatch.setattr(nox.command, "run", run_mock)
+    monkeypatch.setattr(nox.virtualenv, "UV", "uv")
+    monkeypatch.setattr(nox.virtualenv, "HAS_UV", True)
+    monkeypatch.setattr(nox.virtualenv, "UV_VERSION", version.Version("0.10.0"))
+    venv, _ = make_one(venv_backend="uv")
+    venv.create()
+    run_mock.assert_called_once()
+    assert run_mock.call_args.args[0][-1] == "--clear"
+
+
+def test_create_args_old_uv(
+    make_one: Callable[..., tuple[VirtualEnv, Path]],
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    run_mock = mock.Mock()
+    monkeypatch.setattr(nox.virtualenv, "UV", "uv")
+    monkeypatch.setattr(nox.virtualenv, "HAS_UV", True)
+    monkeypatch.setattr(nox.virtualenv, "UV_VERSION", version.Version("0.7.0"))
+    monkeypatch.setattr(nox.command, "run", run_mock)
+    venv, _ = make_one(venv_backend="uv")
+    venv.create()
+    run_mock.assert_called_once()
+    assert run_mock.call_args.args[0][-1] != "--clear"
+
+
 @has_uv
 def test_uv_creation(
     make_one: Callable[..., tuple[VirtualEnv, Path]],