Fix test cases for venv clear and venv lock using venv install

Author: connesy

tests/test_venv_clear.py

@@ -8,7 +8,7 @@
 @pytest.mark.order(after="test_venv_install.py::test_venv_install")
 def test_venv_clear(tmp_path: Path, capfd: pytest.CaptureFixture[str]):
     """Checks that we can clear installed packages in an environment after installing them"""
-    run_command(commands=["venv install --skip-lock", "venv clear"], activated=True, cwd=tmp_path)
+    run_command(commands=["venv install pip --skip-lock", "venv clear"], activated=True, cwd=tmp_path)
 
     output = capfd.readouterr().out
     assert "Removing all packages" in output

tests/test_venv_lock.py

@@ -34,7 +34,7 @@ def test_venv_lock(
 
     run_command(
         commands=[
-            f"venv install {requirements_stem}.txt --skip-lock",
+            f"venv install -r {requirements_stem}.txt --skip-lock",
             f"venv lock {lock_file_arg}",
         ],
         cwd=tmp_path,