feat(pytest-plugin): dep extra to track minimum pytest version

craft_cli/pytest_plugin.py

@@ -25,7 +25,12 @@
 from typing import TYPE_CHECKING, Any, Literal
 from unittest.mock import call
 
-import pytest
+try:
+    import pytest
+except ImportError as err:
+    raise ImportError(
+        "craft-cli's pytest plugin requires pytest; install it with 'craft-cli[pytest]'"
+    ) from err
 from typing_extensions import Self
 
 from craft_cli import messages, printer

docs/changelog.rst

@@ -11,10 +11,17 @@ included in each version.
 3.4.2 (unreleased)
 ------------------
 
+New features:
+
+- Add an optional ``pytest`` dependency group (``craft-cli[pytest]``) to track
+  the minimum pytest version required by the ``emitter`` test plugin.
+
 Bug fixes:
 
 - The ``emitter`` test fixture now rejects a negative ``advance`` amount,
   matching the behavior of the real progress bar.
+- The ``emitter`` test plugin now reports a clear, actionable error message
+  when pytest is not installed, instead of a bare ``ModuleNotFoundError``.
 
 .. _release-3.4.1:
 

pyproject.toml

@@ -33,6 +33,9 @@ Issues = "https://github.com/canonical/craft-cli/issues"
 [project.entry-points.pytest11]
 emitter = "craft_cli.pytest_plugin"
 
+[project.optional-dependencies]
+pytest = ["pytest>=8.4"]
+
 [dependency-groups]
 dev = [
     "coverage[toml]==7.16.2",