Test some run failure cases

tests/custom_test_set.py

@@ -24,3 +24,4 @@ def sparse_only(self) -> bool:
 
     def __iter__(self):
         yield custom_problem(name="custom")
+        yield custom_problem(name="custom_again")  # test only_problem

tests/test_run.py

@@ -13,6 +13,7 @@
 
 import qpbenchmark
 from qpbenchmark import Results
+from qpsolvers import SolverNotFound
 
 from .custom_test_set import CustomTestSet
 
@@ -47,3 +48,23 @@ def test_only_solver(self):
             include_timeouts=False,
         )
         self.assertEqual(len(self.results.df), 1)
+
+    def test_settings_not_found(self):
+        with self.assertRaises(ValueError):
+            qpbenchmark.run(
+                self.test_set,
+                self.results,
+                only_settings="unknown",
+                rerun=False,
+                include_timeouts=False,
+            )
+
+    def test_solver_not_found(self):
+        with self.assertRaises(SolverNotFound):
+            qpbenchmark.run(
+                self.test_set,
+                self.results,
+                only_solver="unknown",
+                rerun=False,
+                include_timeouts=False,
+            )