1-tree.txt

$ tree test
test
├── coordinator_test.exs
├── data
│   ├── post_items.json
│   ├── postitems.1.json
│   ├── postitems.json
│   ├── test_cases
│   │   ├── big
│   │   │   ├── ferrari.done.json
│   │   │   ├── floridawild.done.json
│   │   │   └── postgres.done.json
│   │   ├── one_post_deletion.json
│   │   ├── one_post_one_topic.json
│   │   ├── one_post_redundant_deletion.json
│   │   ├── one_post_two_topics.json
│   │   ├── two_post_deletion.json
│   │   ├── two_post_one_profile_one_topic.json
│   │   ├── two_post_redundant_deletion.json
│   │   ├── two_post_redundant_sentiment_change.json
│   │   ├── two_post_sentiment_change.json
│   │   └── two_profile_three_post_one_topic.json
│   ├── topic_influence.1.json
│   └── topic_influence.json
├── gretel_test.exs
├── helpers
│   ├── dict_pipeline_test.exs
│   └── epoch_test.exs
├── test_helper.exs
├── test_helpers
│   └── topic_worker_test_case_loader.ex
└── topic_worker_test.exs

5 directories, 25 files

2-topic_worker_test_case_loader.exs

# located in test/test_helpers/topic_worker_test_case_loader.exs
defmodule TestHelpers.TopicWorkerTestCaseLoader do
  @test_case_directory "./test/data/test_cases"

  if System.get_env("TEST_LARGE_FILES") == nil do
    @wildcard_path "#{@test_case_directory}/*.json"
  else
    @wildcard_path "#{@test_case_directory}/**/*.json"
  end

  def run_test_cases(define_test_case) do
    Path.wildcard(@wildcard_path)
    |> Enum.each fn (file) ->
      file
      |> read_file
      |> decode_json
      |> load_test_case
      |> define_test_case.()
    end
  end

  def decode_json({ { :ok, file_content }, filename }) do
    { :ok_json, filename, Poison.decode!(file_content) }
  end

  def decode_json({ { :error, error }, filename }) do
    { :error, filename, "Can't load file #{filename}: #{error}" }
  end

  def load_test_case({ :ok_json, filename, %{ "input" => post_items, "output" => expected_stats }}) do
    { :ok, filename, post_items, expected_stats }
  end

  def load_test_case({ :error, _, _ } = error) do
    error
  end

  def read_file(filename) do
    { File.read(filename), filename }
  end
end

3-topic_worker_test.exs

# located in test/topic_worker_test.exs
defmodule TopicWorkerTest do
  use ExUnit.Case
  doctest TopicWorker

  ## THIS IS NOT WORKING
  import TestHelpers.TopicWorkerTestCaseLoader
  ## THIS IS NOT WORKING

  @doc """
    Dynamically define a test for every JSON file in the test_case_directory.
  """
  run_test_cases fn (test_case) ->
    case test_case do
      { :ok, filename, post_items, expected_stats } ->
        @filename filename
        @post_items post_items
        @expected_stats expected_stats

        test "TopicWorker test case: #{@filename}" do
          assert(@expected_stats == TopicWorker.process_events(@post_items))
        end

      { :error, filename, error } ->
        @filename filename
        @error error
        test "TopicWorker test case: #{@filename}" do
          flunk(@error)
        end
    end
  end

end