code: def test_context_at_start():
      terms = frozenset(["alfa"])
      sa = analysis.StandardAnalyzer()
      cf = highlight.ContextFragmenter(surround=15)
      uc = highlight.UppercaseFormatter()
      htext = highlight.highlight(_doc, terms, sa, cf, uc)
      assert htext == "ALFA bravo charlie delta echo foxtrot"
  
imports: from __future__ import with_statement
  import pytest
  from whoosh import analysis, highlight, fields, qparser, query
  from whoosh.compat import u
  from whoosh.filedb.filestore import RamStorage
  from whoosh.util.testing import TempIndex
label_desc: Use image node_id 5 for calling a global function with example usage: test_context_at_start() without return types