Remove flaky tests (#342)

* remove flaky timing-based test

* skip multiobjective NSGA2 tests

* skip only the n_obj=2 test

tests/test_nsga2_multi_objective.py

@@ -45,6 +45,8 @@ def setup_optProb(self, n_obj):
 
     @parameterized.expand([(1,), (2,)])
     def test_opt(self, n_obj):
+        if n_obj == 2:
+            raise unittest.SkipTest("skip flaky NSGA2 tests")
         self.setup_optProb(n_obj)
 
         # 300 generations will find x=(0,0), 200 or less will find x=(1,1)

tests/testing_utils.py

@@ -326,9 +326,6 @@ def check_hist_file(self, tol):
         times = hist.getValues(names="time", major=False)["time"]
         # the times should be monotonically increasing
         self.assertTrue(np.all(np.diff(times) > 0))
-        # the final time should be close to the metadata time
-        # we only specify a relatively loose atol because of variations in overhead cost between machines
-        assert_allclose(times[-1], metadata["optTime"], atol=1.0)
 
         # this check is only used for optimizers that guarantee '0' and 'last' contain funcs
         if self.optName in ["SNOPT", "PSQP"]: