diff --git a/features/multiple-cursors-core.feature b/features/multiple-cursors-core.feature
index 7bbd007..62ebccf 100644
--- a/features/multiple-cursors-core.feature
+++ b/features/multiple-cursors-core.feature
@@ -43,6 +43,20 @@ Feature: Multiple cursors core
     And I type ")"
     Then I should see "This (text contains) the word (text twice)"
 
+  Scenario: Unknown command: yes, do for all
+    Given I have bound C-! to a new command that inserts "a"
+    And I have cursors at "text" in "This text contains the word text twice"
+    When I press "C-! y"
+    And I press "C-!"
+    Then I should see "This aatext contains the word aatext twice"
+
+  Scenario: Unknown command: no, don't do for all
+    Given I have bound C-! to another new command that inserts "a"
+    And I have cursors at "text" in "This text contains the word text twice"
+    When I press "C-! n"
+    And I press "C-!"
+    Then I should see "This aatext contains the word text twice"
+
   Scenario: Setting and popping mark
     Given I have cursors at "text" in "This text contains the word text twice"
     And I press "C-SPC"
diff --git a/features/step-definitions/multiple-cursors-steps.el b/features/step-definitions/multiple-cursors-steps.el
index 0ade5ec..e1734d7 100644
--- a/features/step-definitions/multiple-cursors-steps.el
+++ b/features/step-definitions/multiple-cursors-steps.el
@@ -52,3 +52,15 @@
        (lambda (ins)
          (lexical-let ((ins ins))
            (global-set-key (kbd "C-!") #'(lambda () (interactive) (insert ins))))))
+
+(Given "^I have bound C-! to a new command that inserts \"\\(.+\\)\"$"
+       (lambda (ins)
+         (lexical-let ((ins ins))
+           (defun mc-test-temp-command () (interactive) (insert ins))
+           (global-set-key (kbd "C-!") 'mc-test-temp-command))))
+
+(Given "^I have bound C-! to another new command that inserts \"\\(.+\\)\"$"
+       (lambda (ins)
+         (lexical-let ((ins ins))
+           (defun mc-test-temp-command-2 () (interactive) (insert ins))
+           (global-set-key (kbd "C-!") 'mc-test-temp-command-2))))