Skip locale test if locales are not built, build locales in CI tests

.github/workflows/run-tests.yml

@@ -26,6 +26,17 @@ jobs:
         python -m pip install --upgrade pip
         pip install --upgrade setuptools
         pip install -r requirements.txt
+    - name: Install gettext (Linux)
+      if: runner.os == 'Linux'
+      run: |
+        sudo apt-get update
+        sudo apt-get install gettext
+    - name: Install gettext (macOS)
+      if: runner.os == 'macOS'
+      run: |
+        brew install gettext
+        brew link gettext --force
+        echo "/usr/local/opt/gettext/bin" >> $GITHUB_PATH
     - name: Check coding style
       run: |
         pip install flake8 "isort>=5"
@@ -35,6 +46,7 @@ jobs:
       if: always()
       timeout-minutes: 30
       run: |
+        python setup.py build_locales -i
         pip install pytest pytest-randomly pytest-cov
         pytest --verbose --cov=picard --cov-report xml:coverage.xml test
     - name: Test python-libdiscid (Linux)

test/test_i18n.py

@@ -22,12 +22,16 @@
 import os
 import shutil
 import tempfile
+import unittest
 
 from test.picardtestcase import PicardTestCase
 
 from picard import i18n
 
 
+localedir = os.path.join(os.path.dirname(__file__), '..', 'locale')
+
+
 class TestI18n(PicardTestCase):
 
     def test_missing_locales(self):
@@ -48,8 +52,9 @@ class TestI18n(PicardTestCase):
         self.assertEqual('France', gettext_countries('France'))
         self.assertEqual('Cassette', pgettext_attributes('medium_format', 'Cassette'))
 
+    @unittest.skipUnless(os.path.exists(os.path.join(localedir, 'de')),
+        'Test requires locales to be built with "python setup.py build_locales -i"')
     def test_existing_locales(self):
-        localedir = os.path.join(os.path.dirname(__file__), '..', 'locale')
         locale_de = os.path.join(localedir, 'de', 'LC_MESSAGES', 'picard.mo')
         self.assertTrue(os.path.exists(locale_de), 'expected file %s' % locale_de)
         i18n.setup_gettext(localedir, 'de')