fixing tests

ml-agents-envs/mlagents_envs/tests/test_envs.py

     assert len(spec.sensor_specs) == len(decision_steps.obs)
     assert len(spec.sensor_specs) == len(terminal_steps.obs)
     n_agents = len(decision_steps)
-    for spec, obs in zip(spec.sensor_specs, decision_steps.obs):
-        assert (n_agents,) + spec.shape == obs.shape
+    for sen_spec, obs in zip(spec.sensor_specs, decision_steps.obs):
+        assert (n_agents,) + sen_spec.shape == obs.shape
-    for spec, obs in zip(spec.sensor_specs.shapes, terminal_steps.obs):
-        assert (n_agents,) + spec.shape == obs.shape
+    for sen_spec, obs in zip(spec.sensor_specs, terminal_steps.obs):
+        assert (n_agents,) + sen_spec.shape == obs.shape
 
 
 @mock.patch("mlagents_envs.env_utils.launch_executable")

ml-agents-envs/mlagents_envs/tests/test_steps.py

 def test_empty_decision_steps():
     specs = BehaviorSpec(
         sensor_specs=create_sensor_specs_with_shapes([(3, 2), (5,)]),
-        action_specs=ActionSpec.create_continuous(3),
+        action_spec=ActionSpec.create_continuous(3),
     )
     ds = DecisionSteps.empty(specs)
     assert len(ds.obs) == 2