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# frozen_string_literal: true
module SimpleCov
module ExitCodes
class MaximumCoverageDropCheck
def initialize(result, maximum_coverage_drop)
@result = result
@maximum_coverage_drop = maximum_coverage_drop
end
def failing?
return false unless maximum_coverage_drop && last_run
coverage_drop_violations.any?
end
def report
coverage_drop_violations.each do |violation|
$stderr.printf(
"%<criterion>s coverage has dropped by %<drop_percent>.2f%% since the last time (maximum allowed: %<max_drop>.2f%%).\n",
criterion: violation[:criterion].capitalize,
drop_percent: SimpleCov.round_coverage(violation[:drop_percent]),
max_drop: violation[:max_drop]
)
end
end
def exit_code
SimpleCov::ExitCodes::MAXIMUM_COVERAGE_DROP
end
private
attr_reader :result, :maximum_coverage_drop
def last_run
return @last_run if defined?(@last_run)
@last_run = SimpleCov::LastRun.read
end
def coverage_drop_violations
@coverage_drop_violations ||=
compute_coverage_drop_data.select do |achieved|
achieved.fetch(:max_drop) < achieved.fetch(:drop_percent)
end
end
def compute_coverage_drop_data
maximum_coverage_drop.map do |criterion, percent|
{
criterion: criterion,
max_drop: percent,
drop_percent: drop_percent(criterion)
}
end
end
# if anyone says "max_coverage_drop 0.000000000000000001" I appologize. Please don't.
MAX_DROP_ACCURACY = 10
def drop_percent(criterion)
drop = last_coverage(criterion) -
SimpleCov.round_coverage(
result.coverage_statistics.fetch(criterion).percent
)
# floats, I tell ya.
# irb(main):001:0* 80.01 - 80.0
# => 0.010000000000005116
drop.floor(MAX_DROP_ACCURACY)
end
def last_coverage(criterion)
last_coverage_percent = last_run[:result][criterion]
# fallback for old file format
last_coverage_percent = last_run[:result][:covered_percent] if !last_coverage_percent && criterion == :line
last_coverage_percent || 0
end
end
end
end
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