Add spec for languages without plurals

lib/gitlab/po_linter.rb

@@ -66,7 +66,11 @@ module Gitlab
     def validate_variables(errors, entry)
       if entry[:msgid_plural].present?
         validate_variables_in_message(errors, entry[:msgid], entry['msgstr[0]'])
-        validate_variables_in_message(errors, entry[:msgid_plural], entry['msgstr[1]'])
+
+        # Validate all plurals
+        entry.keys.select { |key_name| key_name =~ /msgstr\[[1-9]\]/ }.each do |plural_key|
+          validate_variables_in_message(errors, entry[:msgid_plural], entry[plural_key])
+        end
       else
         validate_variables_in_message(errors, entry[:msgid], entry[:msgstr])
       end
@@ -80,6 +84,10 @@ module Gitlab
       validate_translation(errors, message_id, required_variables)
 
       message_translation = join_message(message_translation)
+
+      # We don't need to validate when the message is empty.
+      # Translations could fallback to the default, or we could be validating a
+      # language that does not have plurals.
       unless message_translation.empty?
         validate_variable_usage(errors, message_translation, required_variables)
       end

spec/fixtures/multiple_plurals.po

+# Arthur Charron <arthur.charron@hotmail.fr>, 2017. #zanata
+# Huang Tao <htve@outlook.com>, 2017. #zanata
+# Kohei Ota <inductor@kela.jp>, 2017. #zanata
+# Taisuke Inoue <taisuke.inoue.jp@gmail.com>, 2017. #zanata
+# Takuya Noguchi <takninnovationresearch@gmail.com>, 2017. #zanata
+# YANO  Tethurou <tetuyano+zana@gmail.com>, 2017. #zanata
+msgid ""
+msgstr ""
+"Project-Id-Version: gitlab 1.0.0\n"
+"Report-Msgid-Bugs-To: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"PO-Revision-Date: 2017-08-06 11:23-0400\n"
+"Last-Translator: Taisuke Inoue <taisuke.inoue.jp@gmail.com>\n"
+"Language-Team: Japanese \"Language-Team: Russian (https://translate.zanata.org/"
+"project/view/GitLab)\n"
+"Language: ja\n"
+"X-Generator: Zanata 3.9.6\n"
+"Plural-Forms: nplurals=3; plural=n\n"
+
+msgid "%d commit"
+msgid_plural "%d commits"
+msgstr[0] "%d個のコミット"
+msgstr[1] "%d個のコミット"
+msgstr[2] "missing a variable"

spec/fixtures/no_plurals.po

+# Arthur Charron <arthur.charron@hotmail.fr>, 2017. #zanata
+# Huang Tao <htve@outlook.com>, 2017. #zanata
+# Kohei Ota <inductor@kela.jp>, 2017. #zanata
+# Taisuke Inoue <taisuke.inoue.jp@gmail.com>, 2017. #zanata
+# Takuya Noguchi <takninnovationresearch@gmail.com>, 2017. #zanata
+# YANO  Tethurou <tetuyano+zana@gmail.com>, 2017. #zanata
+msgid ""
+msgstr ""
+"Project-Id-Version: gitlab 1.0.0\n"
+"Report-Msgid-Bugs-To: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"PO-Revision-Date: 2017-08-06 11:23-0400\n"
+"Last-Translator: Taisuke Inoue <taisuke.inoue.jp@gmail.com>\n"
+"Language-Team: Japanese \"Language-Team: Russian (https://translate.zanata.org/"
+"project/view/GitLab)\n"
+"Language: ja\n"
+"X-Generator: Zanata 3.9.6\n"
+"Plural-Forms: nplurals=1; plural=0\n"
+
+msgid "%d commit"
+msgid_plural "%d commits"
+msgstr[0] "%d個のコミット"

spec/lib/gitlab/po_linter_spec.rb

@@ -65,6 +65,22 @@ describe Gitlab::PoLinter do
         is_expected.to be_empty
       end
     end
+
+    context 'with missing plurals' do
+      let(:po_path) { 'spec/fixtures/no_plurals.po' }
+
+      it 'has no errors' do
+        is_expected.to be_empty
+      end
+    end
+
+    context 'with multiple plurals' do
+      let(:po_path) { 'spec/fixtures/multiple_plurals.po' }
+
+      it 'has no errors' do
+        is_expected.not_to be_empty
+      end
+    end
   end
 
   describe '#parse_po' do