diff --git a/tests/gflownet/envs/common.py b/tests/gflownet/envs/common.py
index 7e334b041..3dcb1ade3 100644
--- a/tests/gflownet/envs/common.py
+++ b/tests/gflownet/envs/common.py
@@ -1,9 +1,9 @@
+import inspect
 import warnings
 
 import hydra
 import numpy as np
 import pytest
-import inspect
 import torch
 import yaml
 from hydra import compose, initialize
@@ -142,7 +142,7 @@ def test__forward_actions_have_nonzero_backward_prob(self, n_repeat=1):
                 state_prev = copy(state_next)  # TODO: We never use this. Remove?
 
     def test__backward_actions_have_nonzero_forward_prob(self, n_repeat=1):
-        N = 1000
+        N = 100
 
         if _get_current_method_name() in self.repeats:
             n_repeat = self.repeats[_get_current_method_name()]
@@ -372,17 +372,21 @@ def test__state2readable__is_reversible(self, n_repeat=1):
                 self.env.step_random()
 
     def test__get_parents__returns_same_state_and_eos_if_done(self, n_repeat=1):
+        N = 10
+
         if _get_current_method_name() in self.repeats:
             n_repeat = self.repeats[_get_current_method_name()]
 
         for _ in range(n_repeat):
-            self.env.set_state(self.env.state, done=True)
-            parents, actions = self.env.get_parents()
-            if torch.is_tensor(self.env.state):
+            states = _get_terminating_states(self.env, N)
+            if states is None:
+                warnings.warn("Skipping test because states are None.")
+                return
+            for state in states:
+                self.env.set_state(state, done=True)
+                parents, actions = self.env.get_parents()
                 assert all([self.env.equal(p, self.env.state) for p in parents])
-            else:
-                assert parents == [self.env.state]
-            assert actions == [self.env.action_space[-1]]
+                assert actions == [self.env.action_space[-1]]
 
     def test__actions2indices__returns_expected_tensor(self, n_repeat=1):
         BATCH_SIZE = 100
diff --git a/tests/gflownet/envs/test_htorus.py b/tests/gflownet/envs/test_htorus.py
index c393f3e40..afdd76c0c 100644
--- a/tests/gflownet/envs/test_htorus.py
+++ b/tests/gflownet/envs/test_htorus.py
@@ -25,6 +25,7 @@ def test__get_action_space__returns_expected(env, action_space):
     assert set(action_space) == set(env.action_space)
 
 
+@pytest.mark.skip(reason="skip while the environment remains outdated")
 class TestHybridTorus(common.BaseTestsDiscrete):
     @pytest.fixture(autouse=True)
     def setup(self, env):
diff --git a/tests/gflownet/envs/test_tests.py b/tests/gflownet/envs/test_tests.py
index 406985db9..b66b900a0 100644
--- a/tests/gflownet/envs/test_tests.py
+++ b/tests/gflownet/envs/test_tests.py
@@ -1,6 +1,7 @@
-import pytest
 import inspect
 
+import pytest
+
 
 def get_current_method_name():
     return inspect.currentframe().f_back.f_code.co_name