class_docstr: Test TOC Extension. 
class_docstr_tok: ["Test","TOC","Extension","."]
docstr: Test 'unique' function. 
docstr_tok: ["Test","'unique","'","function","."]
code: def testUniqueFunc(self):
      """Test 'unique' function."""
      from markdown.extensions.toc import unique
  
      ids = {"foo"}
      self.assertEqual(unique("foo", ids), "foo_1")
      self.assertEqual(ids, {"foo", "foo_1"})
  
imports: import unittest
  import markdown
label_desc: Use image node_id 15 for calling the TestTOC obj's underlying member method code with example usage: obj.testUniqueFunc() without return types