Add another test to plugin-list.feature.

Signed-off-by: Saul Baizman <[email protected]>

Author: baizmandesign

features/plugin-list.feature

@@ -53,4 +53,12 @@ Feature: List WordPress plugins
     When I run `wp plugin list --fields=name,status,update --force-check`
     Then STDOUT should be a table containing rows:
       | name         | status   | update |
-      | hello-dolly  | inactive | none   |
+      | hello-dolly  | inactive | none   |
+
+    When I try `wp plugin list --skip-update-check --force-check`
+    Then STDERR should contain:
+      """
+      Error: plugin updates cannot be both force-checked and skipped. Choose one.
+      """
+    And STDOUT should be empty
+    And the return code should be 1