The best replacement for integration testing is unit testing.

The best alternatives to integration testing are rated as following:
★★★★★  unit testing
★★★★  regression testing
★★★  system testing
★★  functional testing
★★  end to end testing
★★  user acceptance testing
★★  acceptance testing
★  interface testing
★  smoke testing
★  uat
  qa testing

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Google Trends

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integration testing
unit testing
regression testing