Add test for "replace double-underscores with space in Org TODO kwd"

Feature was added in
https://github.com/kaushalmodi/ox-hugo/commit/7691f0453b.

test/site/content-org/all-posts.org

@@ -1,5 +1,8 @@
 #+hugo_base_dir: ../
+
 #+seq_todo: TODO DRAFT DONE
+#+seq_todo: TEST__TODO | TEST__DONE
+
 #+property: header-args :eval no
 
 #+startup: indent
@@ -3780,6 +3783,16 @@ Some text.
 *** DONE Heading 2
 CLOSED: [2017-08-09 Wed 16:15]
 Some text.
+** Org TODO keywords with double-underscores       :double_underscores:space:
+:PROPERTIES:
+:EXPORT_FILE_NAME: org-todo-kwd-with-double-underscores
+:END:
+#+begin_description
+This feature that replaces double-underscores in Org TODO keywords
+with spaces was added in {{{commit(7691f0453b)}}}.
+#+end_description
+*** TEST__TODO This heading's TODO kwd should read as "TEST TODO"
+*** TEST__DONE This heading's TODO kwd should read as "TEST DONE"
 * Level Offset                                                 :level_offset:
 ** Default level offset
 :PROPERTIES:

test/site/content/posts/org-todo-kwd-with-double-underscores.md

@@ -0,0 +1,14 @@
++++
+title = "Org TODO keywords with double-underscores"
+description = """
+  This feature that replaces double-underscores in Org TODO keywords
+  with spaces was added in commit [7691f0453b](https://github.com/kaushalmodi/ox-hugo/commit/7691f0453b).
+  """
+tags = ["todo", "double-underscores", "space"]
+draft = false
++++
+
+## <span class="org-todo todo TEST__TODO">TEST TODO</span> This heading's TODO kwd should read as "TEST TODO" {#this-heading-s-todo-kwd-should-read-as-test-todo}
+
+
+## <span class="org-todo done TEST__DONE">TEST DONE</span> This heading's TODO kwd should read as "TEST DONE" {#this-heading-s-todo-kwd-should-read-as-test-done}