Patch codecov for fully_bayesian_multitask (pytorch#2295)

Summary:
Pull Request resolved: pytorch#2295

--

Reviewed By: Balandat

Differential Revision: D56050007

fbshipit-source-id: 8e6e8cf222faf6f336cac4e6c377221b510d061c

test/models/test_fully_bayesian_multitask.py

@@ -166,6 +166,15 @@ def test_raises(self):
                 task_feature=4,
             )
         train_X, train_Y, train_Yvar, model = self._get_data_and_model(**tkwargs)
+        with self.assertRaisesRegex(
+            NotImplementedError, "`all_tasks` argument is not supported"
+        ):
+            SaasFullyBayesianMultiTaskGP(
+                train_X=train_X,
+                train_Y=train_Y,
+                task_feature=-1,
+                all_tasks=[0, 1, 2, 3],
+            )
         sampler = IIDNormalSampler(sample_shape=torch.Size([2]))
         with self.assertRaisesRegex(
             NotImplementedError, "Fantasize is not implemented!"