add spec

spec/i18n_spec.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require "i18n/tasks"
+
+describe "I18n sanity" do
+  let(:locales) do
+    ENV["ENFORCED_LOCALES"].presence || "en"
+  end
+
+  let(:i18n) { I18n::Tasks::BaseTask.new({ locales: locales.split(",") }) }
+  let(:missing_keys) { i18n.missing_keys }
+  let(:unused_keys) { i18n.unused_keys }
+  let(:non_normalized_paths) { i18n.non_normalized_paths }
+
+  it "does not have missing keys" do
+    expect(missing_keys).to be_empty, "#{missing_keys.inspect} are missing"
+  end
+
+  # it "does not have unused keys" do
+  #   expect(unused_keys).to be_empty, "#{unused_keys.inspect} are unused"
+  # end
+
+  unless ENV["SKIP_NORMALIZATION"]
+    it "is normalized" do
+      error_message = "The following files need to be normalized:\n" \
+        "#{non_normalized_paths.map { |path| "  #{path}" }.join("\n")}\n" \
+        "Please run `bundle exec i18n-tasks normalize --locales #{locales}` to fix them"
+
+      expect(non_normalized_paths).to be_empty, error_message
+    end
+  end
+end