Add test for early fail of 'venv install'

Author: connesy

tests/test_venv_install.py

@@ -1,4 +1,5 @@
 import re
+import subprocess
 from itertools import chain
 from pathlib import Path
 
@@ -22,6 +23,12 @@ def _check_package_was_installed(requirement: str, installed_line: str) -> None:
     assert package_name in installed_line, f"Package {package_name} was not installed succesfully"
 
 
+def test_venv_install_not_activated(tmp_path: Path, monkeypatch: pytest.MonkeyPatch):
+    with pytest.raises(subprocess.CalledProcessError), monkeypatch.context() as m:
+        m.delenv("VIRTUAL_ENV", raising=False)
+        run_command(["venv install"], cwd=tmp_path, activated=False)
+
+
 @pytest.mark.order(after="test_venv_activate.py::test_venv_activate")
 @parametrize_with_cases(argnames=["files", "requirements_base"], cases=CasesVenvInstallRequirementstxt)
 @pytest.mark.parametrize("use_file_name", [True, False])