Fix remaining endswith → in for No-manager-selected checks in tests

Apply the same robustness fix from the backup test to upgrade, restore,
and install/remove tests: use `in` instead of `endswith` when checking
that the "No manager selected." critical message appears in stderr. At
DEBUG verbosity (or if click_extra emits logger-reset messages after
exit), additional lines can appear after the critical line and break
the endswith assertion.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: kdeldycke

tests/test_cli_install_remove.py

@@ -153,8 +153,9 @@ def test_single_manager_install_and_remove(self, invoke, manager_id, package_id)
 
             if result.exit_code == 2:
                 assert not result.stdout
-                assert result.stderr.endswith(
+                assert (
                     "\x1b[31m\x1b[1mcritical\x1b[0m: No manager selected.\n"
+                    in result.stderr
                 )
             else:
                 assert result.exit_code == 0

tests/test_cli_restore.py

@@ -92,8 +92,9 @@ def test_single_manager(self, invoke, create_config, manager_id):
 
         if result.exit_code == 2:
             assert not result.stdout
-            assert result.stderr.endswith(
+            assert (
                 "\x1b[31m\x1b[1mcritical\x1b[0m: No manager selected.\n"
+                in result.stderr
             )
         else:
             assert result.exit_code == 0

tests/test_cli_upgrade.py

@@ -87,8 +87,9 @@ def test_single_manager_dry_run_upgrade_all(self, invoke, manager_id, all_option
             assert "assume -A/--all option" in result.stderr
         if result.exit_code == 2:
             assert not result.stdout
-            assert result.stderr.endswith(
+            assert (
                 "\x1b[31m\x1b[1mcritical\x1b[0m: No manager selected.\n"
+                in result.stderr
             )
         else:
             assert result.exit_code == 0
@@ -103,8 +104,9 @@ def test_single_manager_upgrade_all(self, invoke, manager_id, all_option):
             assert "assume -A/--all option" in result.stderr
         if result.exit_code == 2:
             assert not result.stdout
-            assert result.stderr.endswith(
+            assert (
                 "\x1b[31m\x1b[1mcritical\x1b[0m: No manager selected.\n"
+                in result.stderr
             )
         else:
             # Accept exit code 1: see test_all_managers_upgrade_all.