feat: Add g:doge_comment_jump_wrap backwards jumping tests

test/options/doge_comment_jump_wrap.vader

@@ -4,7 +4,7 @@
 Given php (PHP function without parameters where g:doge_comment_jump_wrap = 1):
   function myFunction() {}
 
-Do (trigger doge):
+Do (trigger doge and jump forward):
   :let g:doge_comment_jump_wrap = 0\<CR>
   :let g:doge_comment_interactive = 1\<CR>
   \<C-d>
@@ -28,9 +28,31 @@ Expect php (generated comment with a description and @return tag):
    */
   function myFunction() {}
 
+# Jump backwards
+Do (trigger doge and jump backwards):
+  :let g:doge_comment_jump_wrap = 0\<CR>
+  :let g:doge_comment_interactive = 1\<CR>
+  \<C-d>
+# Trigger 2 <S-Tab> characters.
+# The cursor should stay on the first TODO item.
+  \<S-Tab>
+  \<S-Tab>
+
+Then (the first TODO item should be selected):
+  AssertEqual 2, line('.')
+  AssertEqual 4, col('.')
+
+Expect php (generated comment with a description and @return tag):
+  /**
+   * [TODO:description]
+   *
+   * @return [TODO:type] [TODO:description]
+   */
+  function myFunction() {}
+
 # ------------------------------------------------------------------------------
 
-Do (trigger doge):
+Do (trigger doge and jump forward):
   :let g:doge_comment_jump_wrap = 1\<CR>
   :let g:doge_comment_interactive = 1\<CR>
   \<C-d>
@@ -50,6 +72,27 @@ Expect php (generated comment with @param and @return tags):
    */
   function myFunction() {}
 
+# Jump backwards
+Do (trigger doge and jump backwards):
+  :let g:doge_comment_jump_wrap = 1\<CR>
+  :let g:doge_comment_interactive = 1\<CR>
+  \<C-d>
+  \<S-Tab>
+  \<S-Tab>
+  \<S-Tab>
+
+Then (the first TODO item should be selected):
+  AssertEqual 2, line('.')
+  AssertEqual 4, col('.')
+
+Expect php (generated comment with @param and @return tags):
+  /**
+   * [TODO:description]
+   *
+   * @return [TODO:type] [TODO:description]
+   */
+  function myFunction() {}
+
 Do (let g:doge_comment_interactive = 0):
 # Disable the option again so that upcoming tests will not fail.
   :let g:doge_comment_interactive = 0\<CR>