[Question] How can I merge two lcov files into one?

[zoras]

No description provided.

[saimageshvar]

any updates on this?

[ghost]

@zoras @saimageshvar
Looks like there is no direct ability to merge lcov files, but you can merge all simplecov resultset.*.json files into one and then generate lcov file from it:

# frozen_string_literal: true

require "simplecov"
require "simplecov-lcov"

class SimpleCovLcovGenerator
  def self.call(base_dir: "./coverage_results")
    new(base_dir: base_dir).generate
  end

  def initialize(base_dir:)
    @base_dir = base_dir
  end

  def generate
    configure_lcov_formatter
    configure_simple_cov
    collate_results
  end

  private

  attr_reader :base_dir

  def coverage_results
    Dir["#{base_dir}/.resultset.*.json"]
  end

  def collate_results
    SimpleCov.collate(coverage_results, "rails")
  end

  def configure_lcov_formatter
    SimpleCov::Formatter::LcovFormatter.config do |c|
      c.report_with_single_file = true
    end
  end

  def configure_simple_cov
    SimpleCov.configure do
      formatter SimpleCov::Formatter::LcovFormatter
    end
  end
end

SimpleCovLcovGenerator.call

[thorstenspringhart]

I use the npm package lcov-result-merger to merge two lcov files: https://github.com/mweibel/lcov-result-merger
With this i am able to merge my rails code coverage and the javascript coverage into one file