Module: Testprune::Baseline

Defined in:
lib/testprune/baseline.rb

Overview

Identifies “ambient” coverage units — ones executed by so many tests that they carry no signal about what a given test is for. In real suites these come from shared ‘setup`/fixture code (e.g. creating a User fires the same callbacks in hundreds of tests). Left in, they make unrelated tests look identical and produce false “redundant” clusters, so the detector subtracts them first.

Class Method Summary collapse

Class Method Details

.ambient_units(footprints, fraction) ⇒ Object

A unit is ambient if it appears in >= fraction of all tests. fraction nil, <= 0, or >= 1.0 disables subtraction entirely.



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# File 'lib/testprune/baseline.rb', line 14

def self.ambient_units(footprints, fraction)
  return Set.new if fraction.nil? || fraction <= 0.0 || fraction >= 1.0 || footprints.empty?

  threshold = (footprints.size * fraction).ceil
  counts = Hash.new(0)
  footprints.each { |fp| fp.units.each { |unit| counts[unit] += 1 } }
  counts.select { |_unit, count| count >= threshold }.keys.to_set
end