outputs 'env activate' verbose message on stderr (#10353)

Co-authored-by: Randy Döring <[email protected]>

Author: deronnax

src/poetry/console/application.py

@@ -581,7 +581,7 @@ def configure_env(self, event: Event, event_name: str, _: EventDispatcher) -> No
         env = env_manager.create_venv()
 
         if env.is_venv() and io.is_verbose():
-            io.write_line(f"Using virtualenv: <comment>{env.path}</>")
+            io.write_error_line(f"Using virtualenv: <comment>{env.path}</>")
 
         command.set_env(env)
 

tests/console/commands/env/test_activate.py

@@ -5,9 +5,11 @@
 import pytest
 
 from poetry.utils._compat import WINDOWS
+from poetry.utils.env import MockEnv
 
 
 if TYPE_CHECKING:
+    from cleo.testers.application_tester import ApplicationTester
     from cleo.testers.command_tester import CommandTester
     from pytest_mock import MockerFixture
 
@@ -45,9 +47,8 @@ def test_env_activate_prints_correct_script(
 
     tester.execute()
 
-    line = tester.io.fetch_output().split("\n")[0]
-    assert line.startswith(command)
-    assert line.endswith(f"activate{ext}")
+    line = tester.io.fetch_output().rstrip("\n")
+    assert line == f"{command} {tmp_venv.bin_dir}/activate{ext}"
 
 
 @pytest.mark.parametrize(
@@ -73,5 +74,22 @@ def test_env_activate_prints_correct_script_on_windows(
 
     tester.execute()
 
-    line = tester.io.fetch_output().split("\n")[0]
+    line = tester.io.fetch_output().rstrip("\n")
     assert line == f'{prefix}"{tmp_venv.bin_dir / ext!s}"'
+
+
+@pytest.mark.parametrize("verbosity", ["", "-v", "-vv", "-vvv"])
+def test_no_additional_output_in_verbose_mode(
+    tmp_venv: VirtualEnv,
+    mocker: MockerFixture,
+    app_tester: ApplicationTester,
+    verbosity: str,
+) -> None:
+    mocker.patch("shellingham.detect_shell", return_value=("pwsh", None))
+    mocker.patch("poetry.utils.env.EnvManager.get", return_value=MockEnv(is_venv=True))
+
+    # use an AppTester instead of a CommandTester to catch additional output
+    app_tester.execute(f"env activate {verbosity}")
+
+    lines = app_tester.io.fetch_output().splitlines()
+    assert len(lines) == 1

tests/console/commands/test_run.py

@@ -91,7 +91,10 @@ def test_run_passes_args_after_run_before_command_name_conflict(
     path.rename(path.parent / "run")
 
     app_tester.execute(f"{args} python -V", decorated=True)
-    assert app_tester.io.fetch_error() == ""
+    assert (
+        app_tester.io.remove_format(app_tester.io.fetch_error())
+        == f"Using virtualenv: {env.path}\n"
+    )
     assert env.executed == [["python", "-V"]]