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require 'test_helper'
class I18nBackendPluralizationFallbackTest < I18n::TestCase
class Backend < I18n::Backend::Simple
include I18n::Backend::Pluralization
include I18n::Backend::Fallbacks
end
def setup
super
I18n.default_locale = :'en'
I18n.backend = Backend.new
store_translations('en', cat: { zero: 'cat', one: 'cat', other: 'cats' })
store_translations('en-US', cat: { zero: 'no cat', one: nil, other: 'lots of cats' })
store_translations('ru', cat: { one: 'кот', few: 'кошек', many: 'кошка', other: 'кошек' })
# probably not a real locale but just to demonstrate
store_translations('ru-US', cat: { one: nil, few: nil, many: nil, other: nil })
store_translations('ru', i18n: { plural: { rule: russian_rule }})
end
test "fallbacks: nils are ignored and fallback is applied" do
assert_equal "no cat", I18n.t("cat", count: 0, locale: "en-US")
assert_equal "cat", I18n.t("cat", count: 0, locale: "en")
assert_equal "cat", I18n.t("cat", count: 1, locale: "en-US")
assert_equal "cat", I18n.t("cat", count: 1, locale: "en")
assert_equal "lots of cats", I18n.t("cat", count: 2, locale: "en-US")
assert_equal "cats", I18n.t("cat", count: 2, locale: "en")
end
test "fallbacks: nils are ignored and fallback is applied, with custom rule" do
# more specs: https://github.com/svenfuchs/rails-i18n/blob/master/spec/unit/pluralization/east_slavic.rb
assert_equal "кошка", I18n.t("cat", count: 0, locale: "ru")
assert_equal "кошка", I18n.t("cat", count: 0, locale: "ru-US")
assert_equal "кот", I18n.t("cat", count: 1, locale: "ru")
assert_equal "кот", I18n.t("cat", count: 1, locale: "ru-US")
assert_equal "кошек", I18n.t("cat", count: 2, locale: "ru")
assert_equal "кошек", I18n.t("cat", count: 2, locale: "ru-US")
assert_equal "кошек", I18n.t("cat", count: 1.5, locale: "ru")
assert_equal "кошек", I18n.t("cat", count: 1.5, locale: "ru-US")
end
private
# copied from https://github.com/svenfuchs/rails-i18n/blob/master/lib/rails_i18n/common_pluralizations/east_slavic.rb
def russian_rule
lambda do |n|
n ||= 0
mod10 = n % 10
mod100 = n % 100
if mod10 == 1 && mod100 != 11
:one
elsif (2..4).include?(mod10) && !(12..14).include?(mod100)
:few
elsif mod10 == 0 || (5..9).include?(mod10) || (11..14).include?(mod100)
:many
else
:other
end
end
end
end
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