updated apps.lyric.views for simpler login authentication and error messaging; .tests.test_views have new test method to assert either authentication condition has properly occurred

src/apps/lyric/tests/test_views.py

@@ -70,3 +70,14 @@ class LoginViewTest(TestCase):
         user = auth.get_user(self.client)
         self.assertEqual(user.is_authenticated, True)
         self.assertEqual(user.email, "discoman@example.com")
+
+    def test_shows_login_error_if_token_invalid(self):
+        response = self.client.get("/apps/lyric/login?token=invalid-token", follow=True)
+        user = auth.get_user(self.client)
+        self.assertEqual(user.is_authenticated, False)
+        message = list(response.context["messages"])[0]
+        self.assertEqual(
+            message.message,
+            "Invalid login link!—please request a new one",
+        )
+        self.assertEqual(message.tags, "error")