Module: WhatToRun

Extended by:
WhatToRun
Included in:
WhatToRun
Defined in:
lib/what_to_run.rb

Instance Method Summary collapse

Instance Method Details

#cov_map ⇒ Object 



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# File 'lib/what_to_run.rb', line 63

def cov_map
  cov_map = Hash.new { |h, file| h[file] = Hash.new { |i, line| i[line] = [] } }

  File.open('run_log.json') do |f|
    # Read in the coverage info
    JSON.parse(f.read).each do |args|
      if args.length == 4 # for Minitest
        desc = args.first(2).join('#')
      else                # for RSpec
        desc = args.first
      end

      before, after = args.last(2)

      # calculate the per test coverage
      delta = diff before, after

      delta.each_pair do |file, lines|
        file_map = cov_map[file]

        lines.each_with_index do |val, i|
          # skip lines that weren't executed
          next unless val && val > 0

          # add the test name to the map. Multiple tests can execute the same
          # line, so we need to use an array.
          file_map[i + 1] << desc
        end
      end
    end
  end

  cov_map
end

#diff(before, after) ⇒ Object 



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# File 'lib/what_to_run.rb', line 42

def diff before, after
  after.each_with_object({}) do |(file_name,line_cov), res|
    before_line_cov = before[file_name]

    # skip arrays that are exactly the same
    next if before_line_cov == line_cov

    # subtract the old coverage from the new coverage
    cov = line_cov.zip(before_line_cov).map do |line_after, line_before|
      if line_after
        line_after - line_before
      else
        line_after
      end
    end

    # add the "diffed" coverage to the hash
    res[file_name] = cov
  end
end

#lines_to_run ⇒ Object 



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# File 'lib/what_to_run.rb', line 18

def lines_to_run
  repo = Rugged::Repository.new '.'
  lines_to_run = Set.new

  repo.index.diff.each_patch { |patch|
    file = patch.delta.old_file[:path]

    patch.each_hunk { |hunk|
      hunk.each_line { |line|
        case line.line_origin
        when :addition
          lines_to_run << [file, line.new_lineno]
        when :deletion
          lines_to_run << [file, line.old_lineno]
        when :context
          # do nothing
        end
      }
    }
  }

  lines_to_run
end

#predict ⇒ Object 



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# File 'lib/what_to_run.rb', line 9

def predict
  lines_to_run.inject([]) do |tests, (file, line)|
    cov_map[File.expand_path(file)][line].each do |desc|
      tests += Array(desc)
    end
    tests
  end
end