Use switch statements instead of if/else chains.

app/assets/javascripts/merge_request_widget.js.coffee

@@ -55,9 +55,10 @@ class @MergeRequestWidget
       $('.mr-state-widget').replaceWith(data)
 
   ciLabelForStatus: (status) ->
-    if status is 'success'
+    switch status
+      when 'success'
         'passed'
-    else if status is 'success_with_warnings'
+      when 'success_with_warnings'
         'passed with warnings'
       else
         status

app/helpers/ci_status_helper.rb

@@ -15,9 +15,10 @@ module CiStatusHelper
   end
 
   def ci_label_for_status(status)
-    if status == 'success'
+    case status
+    when 'success'
       'passed'
-    elsif status == 'success_with_warnings'
+    when 'success_with_warnings'
       'passed with warnings'
     else
       status