diff --git a/spec/i18next_plurals_spec.cr b/spec/i18next_plurals_spec.cr
new file mode 100644
index 00000000..ec14f418
--- /dev/null
+++ b/spec/i18next_plurals_spec.cr
@@ -0,0 +1,208 @@
+require "spec"
+require "../src/invidious/helpers/i18next.cr"
+
+resolver = I18next::Plurals::RESOLVER
+
+FORM_TESTS = {
+  "ach"   => I18next::Plurals::PluralForms::Single_gt_one,
+  "ar"    => I18next::Plurals::PluralForms::Special_Arabic,
+  "be"    => I18next::Plurals::PluralForms::Dual_Slavic,
+  "cy"    => I18next::Plurals::PluralForms::Special_Welsh,
+  "en"    => I18next::Plurals::PluralForms::Single_not_one,
+  "fr"    => I18next::Plurals::PluralForms::Single_gt_one,
+  "ga"    => I18next::Plurals::PluralForms::Special_Irish,
+  "gd"    => I18next::Plurals::PluralForms::Special_Scottish_Gaelic,
+  "he"    => I18next::Plurals::PluralForms::Special_Hebrew,
+  "is"    => I18next::Plurals::PluralForms::Special_Icelandic,
+  "jv"    => I18next::Plurals::PluralForms::Special_Javanese,
+  "kw"    => I18next::Plurals::PluralForms::Special_Cornish,
+  "lt"    => I18next::Plurals::PluralForms::Special_Lithuanian,
+  "lv"    => I18next::Plurals::PluralForms::Special_Latvian,
+  "mk"    => I18next::Plurals::PluralForms::Special_Macedonian,
+  "mnk"   => I18next::Plurals::PluralForms::Special_Mandinka,
+  "mt"    => I18next::Plurals::PluralForms::Special_Maltese,
+  "or"    => I18next::Plurals::PluralForms::Special_Odia,
+  "pl"    => I18next::Plurals::PluralForms::Special_Polish_Kashubian,
+  "pt"    => I18next::Plurals::PluralForms::Single_gt_one,
+  "pt-PT" => I18next::Plurals::PluralForms::Single_not_one,
+  "pt-BR" => I18next::Plurals::PluralForms::Single_gt_one,
+  "ro"    => I18next::Plurals::PluralForms::Special_Romanian,
+  "su"    => I18next::Plurals::PluralForms::None,
+  "sk"    => I18next::Plurals::PluralForms::Special_Czech_Slovak,
+  "sl"    => I18next::Plurals::PluralForms::Special_Slovenian,
+
+}
+
+SUFFIX_TESTS = {
+  "ach" => [
+    {num: 0, suffix: ""},
+    {num: 1, suffix: ""},
+    {num: 10, suffix: "_plural"},
+  ],
+  "ar" => [
+    {num: 0, suffix: "_0"},
+    {num: 1, suffix: "_1"},
+    {num: 2, suffix: "_2"},
+    {num: 3, suffix: "_3"},
+    {num: 4, suffix: "_3"},
+    {num: 104, suffix: "_3"},
+    {num: 11, suffix: "_4"},
+    {num: 99, suffix: "_4"},
+    {num: 199, suffix: "_4"},
+    {num: 100, suffix: "_5"},
+  ],
+  "be" => [
+    {num: 0, suffix: "_2"},
+    {num: 1, suffix: "_0"},
+    {num: 5, suffix: "_2"},
+  ],
+  "cy" => [
+    {num: 0, suffix: "_2"},
+    {num: 1, suffix: "_0"},
+    {num: 3, suffix: "_2"},
+    {num: 8, suffix: "_3"},
+  ],
+  "en" => [
+    {num: 0, suffix: "_plural"},
+    {num: 1, suffix: ""},
+    {num: 10, suffix: "_plural"},
+  ],
+  "fr" => [
+    {num: 0, suffix: ""},
+    {num: 1, suffix: ""},
+    {num: 10, suffix: "_plural"},
+  ],
+  "ga" => [
+    {num: 1, suffix: "_0"},
+    {num: 2, suffix: "_1"},
+    {num: 3, suffix: "_2"},
+    {num: 7, suffix: "_3"},
+    {num: 11, suffix: "_4"},
+  ],
+  "gd" => [
+    {num: 1, suffix: "_0"},
+    {num: 2, suffix: "_1"},
+    {num: 3, suffix: "_2"},
+    {num: 20, suffix: "_3"},
+  ],
+  "he" => [
+    {num: 0, suffix: "_3"},
+    {num: 1, suffix: "_0"},
+    {num: 2, suffix: "_1"},
+    {num: 3, suffix: "_3"},
+    {num: 20, suffix: "_2"},
+    {num: 21, suffix: "_3"},
+    {num: 30, suffix: "_2"},
+    {num: 100, suffix: "_2"},
+    {num: 101, suffix: "_3"},
+  ],
+  "is" => [
+    {num: 1, suffix: ""},
+    {num: 2, suffix: "_plural"},
+  ],
+  "jv" => [
+    {num: 0, suffix: "_0"},
+    {num: 1, suffix: "_1"},
+  ],
+  "kw" => [
+    {num: 1, suffix: "_0"},
+    {num: 2, suffix: "_1"},
+    {num: 3, suffix: "_2"},
+    {num: 4, suffix: "_3"},
+  ],
+  "lt" => [
+    {num: 1, suffix: "_0"},
+    {num: 2, suffix: "_1"},
+    {num: 10, suffix: "_2"},
+  ],
+  "lv" => [
+    {num: 1, suffix: "_0"},
+    {num: 2, suffix: "_1"},
+    {num: 0, suffix: "_2"},
+  ],
+  "mk" => [
+    {num: 1, suffix: ""},
+    {num: 2, suffix: "_plural"},
+    {num: 0, suffix: "_plural"},
+    {num: 11, suffix: "_plural"},
+    {num: 21, suffix: ""},
+    {num: 31, suffix: ""},
+    {num: 311, suffix: "_plural"},
+  ],
+  "mnk" => [
+    {num: 0, suffix: "_0"},
+    {num: 1, suffix: "_1"},
+    {num: 2, suffix: "_2"},
+  ],
+  "mt" => [
+    {num: 1, suffix: "_0"},
+    {num: 2, suffix: "_1"},
+    {num: 11, suffix: "_2"},
+    {num: 20, suffix: "_3"},
+  ],
+  "or" => [
+    {num: 2, suffix: "_1"},
+    {num: 1, suffix: "_0"},
+  ],
+  "pl" => [
+    {num: 0, suffix: "_2"},
+    {num: 1, suffix: "_0"},
+    {num: 5, suffix: "_2"},
+  ],
+  "pt" => [
+    {num: 0, suffix: ""},
+    {num: 1, suffix: ""},
+    {num: 10, suffix: "_plural"},
+  ],
+  "pt-PT" => [
+    {num: 0, suffix: "_plural"},
+    {num: 1, suffix: ""},
+    {num: 10, suffix: "_plural"},
+  ],
+  "pt-BR" => [
+    {num: 0, suffix: ""},
+    {num: 1, suffix: ""},
+    {num: 10, suffix: "_plural"},
+  ],
+  "ro" => [
+    {num: 0, suffix: "_1"},
+    {num: 1, suffix: "_0"},
+    {num: 20, suffix: "_2"},
+  ],
+  "su" => [
+    {num: 0, suffix: "_0"},
+    {num: 1, suffix: "_0"},
+    {num: 10, suffix: "_0"},
+  ],
+  "sk" => [
+    {num: 0, suffix: "_2"},
+    {num: 1, suffix: "_0"},
+    {num: 5, suffix: "_2"},
+  ],
+  "sl" => [
+    {num: 5, suffix: "_0"},
+    {num: 1, suffix: "_1"},
+    {num: 2, suffix: "_2"},
+    {num: 3, suffix: "_3"},
+  ],
+}
+
+describe "i18next_Plural_Resolver" do
+  describe "get_plural_form" do
+    FORM_TESTS.each do |locale, form|
+      it "returns the right plural form for locale '#{locale}'" do
+        resolver.get_plural_form(locale).should eq(form)
+      end
+    end
+  end
+
+  describe "get_suffix" do
+    SUFFIX_TESTS.each do |locale, data|
+      it "returns the right suffix for locale '#{locale}'" do
+        data.each do |d|
+          resolver.get_suffix(locale, d[:num]).should eq(d[:suffix])
+        end
+      end
+    end
+  end
+end