code: def test_matcher_match_start(matcher):
      doc = Doc(matcher.vocab, words=["JavaScript", "is", "good"])
      assert matcher(doc) == [(matcher.vocab.strings["JS"], 0, 1)]
  
imports: import pytest
  from mock import Mock
  from spacy.matcher import Matcher
  from spacy.tokens import Doc, Span, Token
  from ..doc.test_underscore import clean_underscore
label_desc: Use image node_id 8 for calling a global function with example usage: test_matcher_match_start(matcher) without return types