tester.ex

defmodule Tester do
  def start_run do
    Agent.start(fn -> [total: 0, passed: 0, failed: 0] end, name: :test_stats)
  end

  def record_pass do
    Agent.update(:test_stats, fn [total: t, passed: p, failed: f] ->
      [total: t + 1, passed: p + 1, failed: f]
    end)
  end

  def record_fail do
    Agent.update(:test_stats, fn [total: t, passed: p, failed: f] ->
      [total: t + 1, passed: p, failed: f + 1]
    end)
  end

  def report_results do
    stats = Agent.get(:test_stats, &(&1))
    IO.inspect stats
    Agent.stop(:test_stats)
  end
end