Benchmark Test: Compare LazyLoadable vs Simple backend

test/benchmark/benchmark_lazy_loadable_test.rb

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+require 'test_helper'
+require 'benchmark'
+require 'securerandom'
+
+class BenchmarkLazyLoadableTest < I18n::TestCase
+  test "lazy load performance" do
+    benchmark(backend: I18n::Backend::LazyLoadable.new(lazy_load: true))
+  end
+
+  test "simple performance" do
+    benchmark(backend: I18n::Backend::Simple.new)
+  end
+
+  def benchmark(backend:)
+    @backend = I18n.backend = backend
+    @backend.reload!
+
+    num_files = 100
+    num_keys = 100
+
+    en_files = create_temp_translation_files(locale: "en", num_files: num_files, num_keys: num_keys)
+    fr_files = create_temp_translation_files(locale: "fr", num_files: num_files, num_keys: num_keys)
+    de_files = create_temp_translation_files(locale: "de", num_files: num_files, num_keys: num_keys)
+
+    Benchmark.bm do |x|
+      puts "\n"
+      x.report(@backend.class) do
+        I18n.with_locale(:en) { I18n.t("1.1") }
+        assert_equal num_keys * num_files, translations[:en].size
+      end
+    end
+
+    remove_tempfiles(en_files)
+    remove_tempfiles(fr_files)
+    remove_tempfiles(de_files)
+  end
+
+  def create_temp_translation_files(locale:, num_files:, num_keys:)
+    paths = []
+    num_files.times do |file_num|
+      path = File.join(Dir.tmpdir, "#{locale}_#{SecureRandom.uuid}.yml")
+      File.write(path, generate_random_file_content(locale, num_keys, file_num))
+
+      paths << path
+      I18n.load_path << path
+    end
+    paths
+  end
+
+  def generate_random_file_content(locale, num_keys, file_num)
+    content = {}
+    num_keys.times do |key_num|
+      content["#{file_num}-#{key_num}"] = SecureRandom.alphanumeric
+    end
+
+    { locale => content }.to_yaml
+  end
+
+  def remove_tempfiles(paths)
+    paths.each do |path|
+      I18n.load_path.delete(path)
+      File.delete(path) if File.exist?(path)
+    end
+  end
+end