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Module: SimpleCov::Combine::LinesCombiner

Relationships & Source Files
Defined in: lib/simplecov/combine/lines_combiner.rb

Overview

::SimpleCov::Combine two different lines coverage results on same file

Should be called through SimpleCov.combine.

Class Method Summary

Class Method Details

.combine(coverage_a, coverage_b) (mod_func)

Build a fresh array sized to the longer input. The previous implementation mutated whichever input was longer in place, which could surprise callers holding a reference to that array (e.g. the parsed coverage key of a resultset hash being passed into a second merge).

[ GitHub ] 

  


# File 'lib/simplecov/combine/lines_combiner.rb', line 17



def combine(coverage_a, coverage_b)
  size = [coverage_a.size, coverage_b.size].max
  Array.new(size) { |i| merge_line_coverage(coverage_a[i], coverage_b[i]) }
end


  








  

    .merge_line_coverage(first_val, second_val)  ⇒ Integer || nil  (mod_func)
  



  

    
Two runs of the same source file should agree on which lines
are coverage-relevant (nil for comments / whitespace, 0+
for executable). When they don't, treat "relevant on either
side" as relevant rather than masking a real 0 as nil,
which would silently drop an uncovered line from the
denominator and inflate the percentage.


Logic:


=> nil + nil = nil
=> nil + int = int (preserves a relevant-but-uncovered 0)
=> int + int = int (sum)

  





  
Parameters:


    
  
  • 
    first_val
    (Integer || nil)
  
    • 
  
  • 
    second_val
    (Integer || nil)
  
    • 





  [ GitHub ]


  

  


# File 'lib/simplecov/combine/lines_combiner.rb', line 38



def merge_line_coverage(first_val, second_val)
  return nil if first_val.nil? && second_val.nil?

  first_val.to_i + second_val.to_i
end