fastlane_parallel_tests_run.rb

  private_lane :perform_tests_run do |options|
    devices = options[:devices] || ['iPhone 13 (15.2)', 'iPhone 8 (12.4)']
    scan(
      scheme: options[:scheme],
      devices: devices,
      ensure_devices_found: true,
      reset_simulator: true,
      fail_build: !is_ci, # do not fail the lane since we want test results to be published
       # disable scan output since we need to generate a JUnit report with trainer
       # scan supports only xcpretty (doesn't work correctly with parallel test runs) and xcbeautfiy (doesn't generate neither JUnit nor HTML reports) 
      output_types: ''
    )
    xcresult_path = Actions.lane_context[SharedValues::SCAN_GENERATED_XCRESULT_PATH]

    # Produce JUnit test report
    trainer(
      path: xcresult_path,
      output_directory: './fastlane/test_output',
      extension: '.junit',
      fail_build: !is_ci # do not fail on CI, azure will report fail after publishing the test results
    )
  end