The best replacement for unit testing is integration testing.

The best alternatives to unit testing are rated as following:
★★★★★  integration testing
★★★★★  system testing
★★★  acceptance testing
★★★  functional testing
★★★  component testing
★★  tdd
★★  qa testing
★★  automated testing
★★  end to end testing
★  ui testing
★  uat
★  regression testing
★  bdd
★  smoke testing
  module testing
  integration
  user acceptance testing
  testing
  nunit
  whitebox testing
  assembly testing
  function testing

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Google Trends

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unit testing
integration testing
system testing