realistic generator removed

tests/test_flatland_env_sparse_rail_generator.py

-import os
-
-import numpy as np
-
-from flatland.envs.generators import sparse_rail_generator, realistic_rail_generator
+from flatland.envs.generators import sparse_rail_generator
 from flatland.envs.observations import GlobalObsForRailEnv
 from flatland.envs.rail_env import RailEnv
-from flatland.utils.rendertools import RenderTool, AgentRenderVariant
-
-
-def test_realistic_rail_generator(vizualization_folder_name=None):
-    num_agents = np.random.randint(10, 30)
-    env = RailEnv(width=np.random.randint(40, 80),
-                  height=np.random.randint(10, 20),
-                  rail_generator=realistic_rail_generator(nr_start_goal=num_agents + 1,
-                                                          seed=1,
-                                                          add_max_dead_end=4,
-                                                          two_track_back_bone=1 % 2 == 0),
-                  number_of_agents=num_agents,
-                  obs_builder_object=GlobalObsForRailEnv())
-    # reset to initialize agents_static
-    env_renderer = RenderTool(env, gl="PILSVG", agent_render_variant=AgentRenderVariant.ONE_STEP_BEHIND,
-                              screen_height=600,
-                              screen_width=800)
-    env_renderer.render_env(show=True, show_observations=True, show_predictions=False)
-    if vizualization_folder_name is not None:
-        env_renderer.gl.save_image(
-            os.path.join(
-                vizualization_folder_name,
-                "flatland_frame_{:04d}.png".format(0)
-            ))
-    env_renderer.close_window()
+from flatland.utils.rendertools import RenderTool
 
 
 def test_sparse_rail_generator():