Rearranged some i18n tests

Compilation/extraction tests are now properly skipped when gettext
commands are unavailable.

tests/i18n/test_compilation.py

@@ -1,15 +1,19 @@
 import os
+import unittest
 
 from django.core.management import call_command, CommandError
+from django.core.management.utils import find_command
 from django.test import SimpleTestCase
 from django.test.utils import override_settings
 from django.utils import translation
 from django.utils._os import upath
 from django.utils.six import StringIO
 
-test_dir = os.path.abspath(os.path.dirname(upath(__file__)))
+test_dir = os.path.abspath(os.path.join(os.path.dirname(upath(__file__)), 'commands'))
+has_msgfmt = find_command('msgfmt')
 
 
+@unittest.skipUnless(has_msgfmt, 'msgfmt is mandatory for compilation tests')
 class MessageCompilationTests(SimpleTestCase):
 
     def setUp(self):

tests/i18n/test_extraction.py

@@ -5,10 +5,11 @@ import io
 import os
 import re
 import shutil
-from unittest import SkipTest
+from unittest import SkipTest, skipUnless
 import warnings
 
 from django.core import management
+from django.core.management.utils import find_command
 from django.test import SimpleTestCase
 from django.utils.encoding import force_text
 from django.utils._os import upath
@@ -18,14 +19,17 @@ from django.utils.translation import TranslatorCommentWarning
 
 
 LOCALE = 'de'
+has_xgettext = find_command('xgettext')
 
+@skipUnless(has_xgettext, 'xgettext is mandatory for extraction tests')
 class ExtractorTests(SimpleTestCase):
 
     PO_FILE = 'locale/%s/LC_MESSAGES/django.po' % LOCALE
 
     def setUp(self):
         self._cwd = os.getcwd()
-        self.test_dir = os.path.abspath(os.path.dirname(upath(__file__)))
+        self.test_dir = os.path.abspath(
+            os.path.join(os.path.dirname(upath(__file__)), 'commands'))
 
     def _rmrf(self, dname):
         if os.path.commonprefix([self.test_dir, os.path.abspath(dname)]) != self.test_dir:
@@ -302,8 +306,7 @@ class IgnoredExtractorTests(ExtractorTests):
 class SymlinkExtractorTests(ExtractorTests):
 
     def setUp(self):
-        self._cwd = os.getcwd()
+        super(SymlinkExtractorTests, self).setUp()
-        self.test_dir = os.path.abspath(os.path.dirname(upath(__file__)))
         self.symlinked_dir = os.path.join(self.test_dir, 'templates_symlinked')
 
     def tearDown(self):

tests/i18n/tests.py

@@ -9,7 +9,6 @@ import pickle
 from threading import local
 
 from django.conf import settings
-from django.core.management.utils import find_command
 from django.template import Template, Context
 from django.template.base import TemplateSyntaxError
 from django.test import TestCase, RequestFactory
@@ -34,16 +33,6 @@ from django.utils.translation import (activate, deactivate,
     npgettext, npgettext_lazy,
     check_for_language)
 
-if find_command('xgettext'):
-    from .commands.extraction import (ExtractorTests, BasicExtractorTests,
-        JavascriptExtractorTests, IgnoredExtractorTests, SymlinkExtractorTests,
-        CopyPluralFormsExtractorTests, NoWrapExtractorTests,
-        LocationCommentsTests, KeepPotFileExtractorTests,
-        MultipleLocaleExtractionTests)
-if find_command('msgfmt'):
-    from .commands.compilation import (PoFileTests, PoFileContentsTests,
-        PercentRenderingTests, MultipleLocaleCompilationTests,
-        CompilationErrorHandling)
 from .forms import I18nForm, SelectDateForm, SelectDateWidget, CompanyForm
 from .models import Company, TestModel