diff --git a/src/imitation/testing/envs.py b/src/imitation/testing/envs.py
deleted file mode 100644
index 72978dd1a..000000000
--- a/src/imitation/testing/envs.py
+++ /dev/null
@@ -1,35 +0,0 @@
-"""Helper methods for tests of custom Gym environments.
-
-This is used in the imitation test suite and may also be useful for users of this
-library.
-"""
-
-import gym
-
-
-def test_model_based(env: gym.Env) -> None:
-    """Smoke test for each of the ModelBasedEnv methods with type checks.
-
-    Args:
-        env: The environment to test.
-
-    Raises:
-        AssertionError if test fails.
-    """
-    state = env.initial_state()
-    assert env.state_space.contains(state)
-
-    action = env.action_space.sample()
-    new_state = env.transition(state, action)
-    assert env.state_space.contains(new_state)
-
-    reward = env.reward(state, action, new_state)
-    assert isinstance(reward, float)
-
-    done = env.terminal(state, 0)
-    assert isinstance(done, bool)
-
-    obs = env.obs_from_state(state)
-    assert env.observation_space.contains(obs)
-    next_obs = env.obs_from_state(new_state)
-    assert env.observation_space.contains(next_obs)
diff --git a/tests/test_envs.py b/tests/test_envs.py
deleted file mode 100644
index 194a0f596..000000000
--- a/tests/test_envs.py
+++ /dev/null
@@ -1,49 +0,0 @@
-"""Tests for seal environments."""
-from typing import List
-
-import gym
-import pytest
-from seals.testing import envs as seals_test
-
-from imitation.testing import envs as imitation_test
-
-ENV_NAMES = [
-    env_spec.id
-    for env_spec in gym.envs.registration.registry.all()
-    if env_spec.id.startswith("imitation/")
-]
-
-DETERMINISTIC_ENVS: List[str] = []
-
-env = pytest.fixture(seals_test.make_env_fixture(skip_fn=pytest.skip))
-
-
-@pytest.mark.parametrize("env_name", ENV_NAMES)
-class TestEnvs:
-    """Battery of simple tests for environments."""
-
-    def test_seed(self, env, env_name):
-        seals_test.test_seed(env, env_name, DETERMINISTIC_ENVS)
-
-    def test_premature_step(self, env):
-        """Test that you must call reset() before calling step()."""
-        seals_test.test_premature_step(
-            env,
-            skip_fn=pytest.skip,
-            raises_fn=pytest.raises,
-        )
-
-    def test_model_based(self, env):
-        """Smoke test for each of the ModelBasedEnv methods with type checks."""
-        if not hasattr(env, "pomdp_state_space"):  # pragma: no cover
-            pytest.skip("This test is only for subclasses of ResettableEnv.")
-
-        imitation_test.test_model_based(env)
-
-    def test_rollout_schema(self, env: gym.Env):
-        """Tests if environments have correct types on `step()` and `reset()`."""
-        seals_test.test_rollout_schema(env)
-
-    def test_render(self, env: gym.Env):
-        """Tests `render()` supports modes specified in environment metadata."""
-        seals_test.test_render(env, raises_fn=pytest.raises)