Add ecukes integration test for completing overrides

features/complete-overrides.feature

@@ -0,0 +1,28 @@
+Feature: Complete overrides
+
+  Background:
+    Given I open temp file "some-file.cs"
+    Given The buffer is empty
+
+  Scenario: Complete overrides in the current buffer with ido
+    When My buffer contents are, and my point is at $:
+      """
+      namespace Test {
+          public class Awesome {
+              $
+          }
+      }
+      """
+    Given I start an action chain
+    And I press "M-x"
+    And I type "omnisharp-auto-complete-overrides"
+    # Finish M-x
+    And I press "RET"
+    # Select the first proposed override
+    And I press "RET"
+    And I execute the action chain
+
+    Then I should see, ignoring line endings:
+      """
+      public override bool Equals(object obj)
+      """

omnisharp.el

@@ -981,8 +981,8 @@ omnisharp--last-buffer-specific-auto-complete-result."
 
 (defun omnisharp-auto-complete-overrides ()
   (interactive)
-  (let ((params (omnisharp--get-common-params)))
-    (omnisharp-auto-complete-overrides-worker params)))
+  (omnisharp-auto-complete-overrides-worker
+   (omnisharp--get-common-params)))
 
 (defun omnisharp-auto-complete-overrides-worker (params)
   (let* ((json-result