fix: Added test coverage to admin preview view

CHANGELOG.rst

@@ -4,7 +4,7 @@ Changelog
 
 Unreleased
 ==========
-
+* fix: Added test coverage to admin preview view
 
 4.0.0.dev4 (2022-02-03)
 =======================

tests/test_views.py

@@ -0,0 +1,40 @@
+from cms.test_utils.testcases import CMSTestCase
+from cms.utils.urlutils import admin_reverse
+
+from .utils.factories import SnippetWithVersionFactory
+
+
+class PreviewViewTestCase(CMSTestCase):
+    def setUp(self):
+        self.snippet = SnippetWithVersionFactory(html="<h1>Test Title</h1><br><p>Test paragraph</p>")
+        self.user = self.get_superuser()
+
+    def test_preview_renders_html(self):
+        """
+        Check that our snippet HTML is rendered, unescaped, on the page
+        """
+        preview_url = admin_reverse(
+            "djangocms_snippet_snippet_preview",
+            kwargs={"snippet_id": self.snippet.id},
+        )
+        with self.login_user_context(self.user):
+            response = self.client.get(preview_url)
+
+        self.assertEqual(self.snippet.html, "<h1>Test Title</h1><br><p>Test paragraph</p>")
+        self.assertEqual(response.status_code, 200)
+        # Removing html escaping, means the content  is rendered including the tags on the page, but also means that
+        # the response will contain character entity references.
+        self.assertContains(response, "&lt;h1&gt;Test Title&lt;/h1&gt;&lt;br&gt;&lt;p&gt;Test paragraph&lt;/p&gt;")
+
+    def test_preview_raises_302_no_snippet(self):
+        """
+        With no Snippet to preview, a 302 will be raised and the user will be redirected to the admin
+        """
+        preview_url = admin_reverse(
+            "djangocms_snippet_snippet_preview",
+            kwargs={"snippet_id": 999},  # Non existent PK!
+        )
+        with self.login_user_context(self.user):
+            response = self.client.get(preview_url)
+
+        self.assertEqual(response.status_code, 302)