Added test for not a checkbox, should fail

Author: harshad1

spec/checkboxes_spec.rb

@@ -35,6 +35,7 @@
       - [.] fourth bullet
       - [o] fifth bullet
       - [O] sixth bullet
+      - not a checkbox
     TEXT
 
     vim.edit filename
@@ -50,6 +51,8 @@
     vim.command 'ToggleCheckbox'
     vim.normal 'j'
     vim.command 'ToggleCheckbox'
+    vim.normal 'j'
+    vim.command 'ToggleCheckbox'
     vim.write
 
     file_contents = IO.read(filename)
@@ -62,6 +65,7 @@
       - [X] fourth bullet
       - [X] fifth bullet
       - [X] sixth bullet
+      - not a checkbox
 
     TEXT
   end