new_contents: #!/usr/bin/env python3
  # -*- coding: UTF-8 -*-
  
  import pytest  # type: ignore
  
  from sensibility.language import Language
  from sensibility.language.javascript import javascript
  from sensibility.token_utils import Position
  
  from location_factory import LocationFactory
  
  test_file = r"""#!/usr/bin/env node
  /*!
   * This is an example file.
   */
  
  import {ಠ_ಠ} from "-_-";
  
  /* TODO: crazy ES2017 features. */
  """
  
  def test_sanity_check() -> None:
      assert isinstance(javascript, Language)
  
  
  def test_tokenize() -> None:
      tokens = javascript.tokenize(test_file)
      # TODO: more robust tests for this.
      assert len(tokens) == 7
  
  
  def test_summarize() -> None:
      with pytest.raises(SyntaxError):
          javascript.summarize('import #')
  
      summary = javascript.summarize(test_file)
      assert summary.sloc == 1
      assert summary.n_tokens == 7
  
  
  def test_pipeline() -> None:
      loc = LocationFactory(Position(line=6, column=0))
      result = list(javascript.pipeline.execute_with_locations(test_file))
      assert result[:4] == [
          (loc.across(len("import")),         'IMPORT'),
          (loc.space().across(1),             '{'),
          (loc.space().across(len("ಠ_ಠ")),    'IDENTIFIER'),
          (loc.space().across(1),             '}'),
      ]
      # TODO: Test more locations?
  
subject: Create tests for JavaScript parser.