Shows one way to fail a build in fastlane when code coverage does not meet a minimum threshold.

Fastfile

#
# Shows one way to fail a build in fastlane when code 
# coverage does not meet a minimum threshold.  
#
# there are other ways to check the coverage of the commit, 
# but I couldn't find an existing tool that makes this easier 
# that will run on bitrise.  I would have normally used diff-cover 
# to do this because you can compare branches and only check the diffs.  
# Unfortunately that means you have to find a way to install it on bitrise
# at the time of writing and that can be tricky.  
#
# Still, this is a pretty good approach for most cases.  
#

# somewhere towards the top
require 'open3'

#
# where app constants live
# minimum coverage % for the project as a whole
#
coverage_limit = 80 

# wherever you want, below that require
desc "Runs the CI job"
  lane :ci do
    cocoapods # will run a pod install automatically
    unit # assumes you have a lane called unit that runs unit tests for you.  I used fastlane's scan tool to do this.

    stdout, stderr, status = Open3.capture3('slather coverage --ignore="Pods/*" --ignore="../*" --workspace ../MyWorkspace.xcworkspace --scheme MyScheme ../MyProject.xcodeproj')
    matches = /Test Coverage: (\d+(\.\d+)?)/.match(stdout)
    full_coverage = (matches && matches.captures.length > 0) ? matches.captures[0] : nil

    if full_coverage != nil && full_coverage.length > 0 && full_coverage.to_i < coverage_limit
      puts stderr
      puts red("ERROR: You are under the code coverage limit (is: #{full_coverage}%, should be at least: #{coverage_limit}%). Please raise code coverage and try again.")
      abort()
    end
  end
  

Thanks a lot!!!