Close GitLab issue #302 'New Document' button available to users who do not have permission.

Thanks to kg @kgraves.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/sources/tests/test_links.py

@@ -0,0 +1,31 @@
+from __future__ import unicode_literals
+
+from django.contrib.contenttypes.models import ContentType
+from django.urls import reverse
+
+from acls.models import AccessControlList
+from documents.tests import GenericDocumentViewTestCase
+from documents.permissions import permission_document_create
+
+from ..links import link_document_create_multiple
+
+
+class SourcesLinksTestCase(GenericDocumentViewTestCase):
+    def setUp(self):
+        super(SourcesLinksTestCase, self).setUp()
+        self.login_user()
+
+    def _get_document_create_link(self):
+        self.add_test_view(test_object=self.document)
+        context = self.get_test_view()
+        context['user'] = self.user
+        return link_document_create_multiple.resolve(context=context)
+
+    def test_document_create_link_no_access(self):
+        resolved_link = self._get_document_create_link()
+        self.assertEqual(resolved_link, None)
+
+    def test_document_create_link_with_access(self):
+        self.grant_access(permission=permission_document_create, obj=self.document_type)
+        resolved_link = self._get_document_create_link()
+        self.assertNotEqual(resolved_link, None)