remove redundant assertion from test code

As we use the equivalent pytest-based assertion, the old assertion is redundant

benchexec/test_core_assignment_new.py

@@ -54,7 +54,6 @@ def class_decorator(c) -> callable:
         for number_cores, number_threads in core_and_thread_tupels:
 
             def decorator_test_invalid(self):
-                self.assertInvalid(number_cores, number_threads)
                 with pytest.raises(SystemExit):
                     get_cpu_distribution(
                         number_cores,
@@ -95,16 +94,6 @@ def assertValid(self, coreLimit, num_of_threads, expectedResult=None):
                 f"Incorrect result for {coreLimit} cores and {num_of_threads} threads.",
             )
 
-    def assertInvalid(self, coreLimit, num_of_threads):
-        self.assertRaises(
-            SystemExit,
-            get_cpu_distribution,
-            coreLimit,
-            num_of_threads,
-            self.use_hyperthreading,
-            *self.machine(),
-        )
-
     machine_definition = None
 
     def test_assert_refactor_translation_identical(self):