Add spec (test case) for locale files consistency

spec/locales_spec.cr

@@ -0,0 +1,31 @@
+require "spec"
+require "json"
+require "../src/invidious/helpers/i18n.cr"
+
+describe "Locales" do
+
+  describe "#consistency" do
+    locales_list = LOCALES.keys.select! { |key| key != "en-US" }
+
+    locales_list.each do |locale|
+      puts "\nChecking locale #{locale}"
+      failed = false
+
+      # Use "en-US" as the reference
+      LOCALES["en-US"].each_key do |ref_key|
+        # Catch exception in order to give a hint on what caused
+        # the failure, and test one locale completely before failing
+        begin
+          LOCALES[locale].has_key?(ref_key).should be_true
+        rescue
+          failed = true
+          puts "  Missing key in locale #{locale}: '#{ref_key}'"
+        end
+      end
+
+      # Throw failed assertion exception in here
+      failed.should be_false
+    end
+  end
+
+end