diff --git a/src/mudlib/commands/movement.py b/src/mudlib/commands/movement.py
index 59a5ac4..4842737 100644
--- a/src/mudlib/commands/movement.py
+++ b/src/mudlib/commands/movement.py
@@ -1,13 +1,9 @@
 """Movement commands for navigating the world."""
 
-from typing import Any
-
 from mudlib.commands import CommandDefinition, register
 from mudlib.entity import Entity
-from mudlib.player import Player, players
-
-# World instance will be injected by the server
-world: Any = None
+from mudlib.player import Player
+from mudlib.zone import Zone
 
 # Direction mappings: command -> (dx, dy)
 DIRECTIONS: dict[str, tuple[int, int]] = {
@@ -66,10 +62,12 @@ async def move_player(player: Player, dx: int, dy: int, direction_name: str) ->
         dy: Y delta
         direction_name: Full name of the direction for messages
     """
-    target_x, target_y = world.wrap(player.x + dx, player.y + dy)
+    zone = player.location
+    assert isinstance(zone, Zone), "Player must be in a zone to move"
+    target_x, target_y = zone.wrap(player.x + dx, player.y + dy)
 
     # Check if the target is passable
-    if not world.is_passable(target_x, target_y):
+    if not zone.is_passable(target_x, target_y):
         await player.send("You can't go that way.\r\n")
         return
 
@@ -106,17 +104,11 @@ async def send_nearby_message(entity: Entity, x: int, y: int, message: str) -> N
     # For now, use a simple viewport range (could be configurable)
     viewport_range = 10
 
-    for other in players.values():
-        if other.name == entity.name:
-            continue
-
-        # Check if other player is within viewport range (wrapping)
-        dx_dist = abs(other.x - x)
-        dy_dist = abs(other.y - y)
-        dx_dist = min(dx_dist, world.width - dx_dist)
-        dy_dist = min(dy_dist, world.height - dy_dist)
-        if dx_dist <= viewport_range and dy_dist <= viewport_range:
-            await other.send(message)
+    zone = entity.location
+    assert isinstance(zone, Zone), "Entity must be in a zone to send nearby messages"
+    for obj in zone.contents_near(x, y, viewport_range):
+        if obj is not entity and isinstance(obj, Entity):
+            await obj.send(message)
 
 
 # Define individual movement command handlers
diff --git a/src/mudlib/server.py b/src/mudlib/server.py
index 5693c23..e9a57d3 100644
--- a/src/mudlib/server.py
+++ b/src/mudlib/server.py
@@ -431,7 +431,6 @@ async def run_server() -> None:
     # Inject world into command modules
     mudlib.commands.fly.world = _world
     mudlib.commands.look.world = _world
-    mudlib.commands.movement.world = _world
     mudlib.combat.commands.world = _world
 
     # Load content-defined commands from TOML files
diff --git a/tests/test_combat_commands.py b/tests/test_combat_commands.py
index 2dd2f5f..2f9d01e 100644
--- a/tests/test_combat_commands.py
+++ b/tests/test_combat_commands.py
@@ -6,11 +6,11 @@ from unittest.mock import AsyncMock, MagicMock
 
 import pytest
 
-import mudlib.commands.movement as movement_mod
 from mudlib.combat import commands as combat_commands
 from mudlib.combat.engine import active_encounters, get_encounter
 from mudlib.combat.moves import load_moves
 from mudlib.player import Player, players
+from mudlib.zone import Zone
 
 
 @pytest.fixture(autouse=True)
@@ -23,16 +23,19 @@ def clear_state():
     players.clear()
 
 
-@pytest.fixture(autouse=True)
-def mock_world():
-    """Inject a mock world for send_nearby_message."""
-    fake_world = MagicMock()
-    fake_world.width = 256
-    fake_world.height = 256
-    old = movement_mod.world
-    movement_mod.world = fake_world
-    yield fake_world
-    movement_mod.world = old
+@pytest.fixture
+def test_zone():
+    """Create a test zone for players."""
+    terrain = [["." for _ in range(256)] for _ in range(256)]
+    zone = Zone(
+        name="testzone",
+        width=256,
+        height=256,
+        toroidal=True,
+        terrain=terrain,
+        impassable=set(),
+    )
+    return zone
 
 
 @pytest.fixture
@@ -49,15 +52,19 @@ def mock_reader():
 
 
 @pytest.fixture
-def player(mock_reader, mock_writer):
+def player(mock_reader, mock_writer, test_zone):
     p = Player(name="Goku", x=0, y=0, reader=mock_reader, writer=mock_writer)
+    p.location = test_zone
+    test_zone._contents.append(p)
     players[p.name] = p
     return p
 
 
 @pytest.fixture
-def target(mock_reader, mock_writer):
+def target(mock_reader, mock_writer, test_zone):
     t = Player(name="Vegeta", x=0, y=0, reader=mock_reader, writer=mock_writer)
+    t.location = test_zone
+    test_zone._contents.append(t)
     players[t.name] = t
     return t
 
diff --git a/tests/test_commands.py b/tests/test_commands.py
index 0c6d86b..61df505 100644
--- a/tests/test_commands.py
+++ b/tests/test_commands.py
@@ -9,6 +9,7 @@ from mudlib.commands import CommandDefinition, look, movement
 from mudlib.effects import active_effects, add_effect
 from mudlib.player import Player
 from mudlib.render.ansi import RESET
+from mudlib.zone import Zone
 
 
 @pytest.fixture
@@ -25,21 +26,26 @@ def mock_reader():
 
 
 @pytest.fixture
-def mock_world():
-    world = MagicMock()
-    world.width = 100
-    world.height = 100
-    world.is_passable = MagicMock(return_value=True)
-    world.wrap = MagicMock(side_effect=lambda x, y: (x % 100, y % 100))
-    # Create a 21x11 viewport filled with "."
-    viewport = [["." for _ in range(21)] for _ in range(11)]
-    world.get_viewport = MagicMock(return_value=viewport)
-    return world
+def test_zone():
+    # Create a 100x100 zone filled with passable terrain
+    terrain = [["." for _ in range(100)] for _ in range(100)]
+    zone = Zone(
+        name="testzone",
+        width=100,
+        height=100,
+        toroidal=True,
+        terrain=terrain,
+        impassable=set(),  # All terrain is passable for tests
+    )
+    return zone
 
 
 @pytest.fixture
-def player(mock_reader, mock_writer):
-    return Player(name="TestPlayer", x=5, y=5, reader=mock_reader, writer=mock_writer)
+def player(mock_reader, mock_writer, test_zone):
+    p = Player(name="TestPlayer", x=5, y=5, reader=mock_reader, writer=mock_writer)
+    p.location = test_zone
+    test_zone._contents.append(p)
+    return p
 
 
 # Test command registration
@@ -132,11 +138,10 @@ def test_direction_deltas(direction, expected_delta):
 
 
 @pytest.mark.asyncio
-async def test_movement_updates_position(player, mock_world):
+async def test_movement_updates_position(player, test_zone):
     """Test that movement updates player position when passable."""
-    # Inject mock world into both movement and look modules
-    movement.world = mock_world
-    look.world = mock_world
+    # Inject test_zone into look command (still uses module-level world)
+    look.world = test_zone
 
     # Clear players registry to avoid test pollution
     from mudlib.player import players
@@ -148,14 +153,15 @@ async def test_movement_updates_position(player, mock_world):
 
     assert player.x == original_x
     assert player.y == original_y - 1
-    assert mock_world.is_passable.called
 
 
 @pytest.mark.asyncio
-async def test_movement_blocked_by_impassable_terrain(player, mock_world, mock_writer):
+async def test_movement_blocked_by_impassable_terrain(player, test_zone, mock_writer):
     """Test that movement is blocked by impassable terrain."""
-    mock_world.is_passable.return_value = False
-    movement.world = mock_world
+    # Make the target position impassable
+    target_y = player.y - 1
+    test_zone.terrain[target_y][player.x] = "^"  # mountain
+    test_zone.impassable = {"^"}
 
     original_x, original_y = player.x, player.y
     await movement.move_north(player, "")
@@ -171,10 +177,9 @@ async def test_movement_blocked_by_impassable_terrain(player, mock_world, mock_w
 
 
 @pytest.mark.asyncio
-async def test_movement_sends_departure_message(player, mock_world):
+async def test_movement_sends_departure_message(player, test_zone):
     """Test that movement sends departure message to nearby players."""
-    movement.world = mock_world
-    look.world = mock_world
+    look.world = test_zone
 
     # Create another player in the area
     other_writer = MagicMock()
@@ -183,6 +188,8 @@ async def test_movement_sends_departure_message(player, mock_world):
     other_player = Player(
         name="OtherPlayer", x=5, y=4, reader=MagicMock(), writer=other_writer
     )
+    other_player.location = test_zone
+    test_zone._contents.append(other_player)
 
     # Register both players
     from mudlib.player import players
@@ -199,10 +206,9 @@ async def test_movement_sends_departure_message(player, mock_world):
 
 
 @pytest.mark.asyncio
-async def test_arrival_message_uses_opposite_direction(player, mock_world):
+async def test_arrival_message_uses_opposite_direction(player, test_zone):
     """Test that arrival messages use the opposite direction."""
-    movement.world = mock_world
-    look.world = mock_world
+    look.world = test_zone
 
     # Create another player at the destination
     other_writer = MagicMock()
@@ -211,6 +217,8 @@ async def test_arrival_message_uses_opposite_direction(player, mock_world):
     other_player = Player(
         name="OtherPlayer", x=5, y=3, reader=MagicMock(), writer=other_writer
     )
+    other_player.location = test_zone
+    test_zone._contents.append(other_player)
 
     from mudlib.player import players
 
@@ -228,20 +236,20 @@ async def test_arrival_message_uses_opposite_direction(player, mock_world):
 
 # Test look command
 @pytest.mark.asyncio
-async def test_look_command_sends_viewport(player, mock_world):
+async def test_look_command_sends_viewport(player, test_zone):
     """Test that look command sends the viewport to the player."""
-    look.world = mock_world
+    # look.py still uses module-level world, so inject test_zone
+    look.world = test_zone
 
     await look.cmd_look(player, "")
 
-    assert mock_world.get_viewport.called
     assert player.writer.write.called
 
 
 @pytest.mark.asyncio
-async def test_look_command_shows_player_at_center(player, mock_world):
+async def test_look_command_shows_player_at_center(player, test_zone):
     """Test that look command shows player @ at center."""
-    look.world = mock_world
+    look.world = test_zone
 
     await look.cmd_look(player, "")
 
@@ -251,9 +259,9 @@ async def test_look_command_shows_player_at_center(player, mock_world):
 
 
 @pytest.mark.asyncio
-async def test_look_command_shows_other_players(player, mock_world):
+async def test_look_command_shows_other_players(player, test_zone):
     """Test that look command shows other players as *."""
-    look.world = mock_world
+    look.world = test_zone
 
     # Create another player in the viewport
     other_player = Player(
@@ -263,6 +271,8 @@ async def test_look_command_shows_other_players(player, mock_world):
         reader=MagicMock(),
         writer=MagicMock(),
     )
+    other_player.location = test_zone
+    test_zone._contents.append(other_player)
 
     from mudlib.player import players
 
@@ -278,9 +288,9 @@ async def test_look_command_shows_other_players(player, mock_world):
 
 
 @pytest.mark.asyncio
-async def test_look_shows_effects_on_viewport(player, mock_world):
+async def test_look_shows_effects_on_viewport(player, test_zone):
     """Test that active effects overlay on the viewport."""
-    look.world = mock_world
+    look.world = test_zone
 
     from mudlib.player import players
 
@@ -303,9 +313,9 @@ async def test_look_shows_effects_on_viewport(player, mock_world):
 
 
 @pytest.mark.asyncio
-async def test_effects_dont_override_player_marker(player, mock_world):
+async def test_effects_dont_override_player_marker(player, test_zone):
     """Effects at the player's position should not hide the @ marker."""
-    look.world = mock_world
+    look.world = test_zone
 
     from mudlib.player import players
 
diff --git a/tests/test_fly.py b/tests/test_fly.py
index e68c600..53c61a3 100644
--- a/tests/test_fly.py
+++ b/tests/test_fly.py
@@ -5,9 +5,10 @@ from unittest.mock import AsyncMock, MagicMock
 
 import pytest
 
-from mudlib.commands import fly, look, movement
+from mudlib.commands import fly, look
 from mudlib.effects import active_effects
 from mudlib.player import Player, players
+from mudlib.zone import Zone
 
 
 @pytest.fixture
@@ -24,27 +25,32 @@ def mock_reader():
 
 
 @pytest.fixture
-def mock_world():
-    world = MagicMock()
-    world.width = 100
-    world.height = 100
-    world.wrap = MagicMock(side_effect=lambda x, y: (x % 100, y % 100))
-    viewport = [["." for _ in range(21)] for _ in range(11)]
-    world.get_viewport = MagicMock(return_value=viewport)
-    return world
+def test_zone():
+    terrain = [["." for _ in range(100)] for _ in range(100)]
+    zone = Zone(
+        name="testzone",
+        width=100,
+        height=100,
+        toroidal=True,
+        terrain=terrain,
+        impassable=set(),
+    )
+    return zone
 
 
 @pytest.fixture
-def player(mock_reader, mock_writer):
-    return Player(name="shmup", x=50, y=50, reader=mock_reader, writer=mock_writer)
+def player(mock_reader, mock_writer, test_zone):
+    p = Player(name="shmup", x=50, y=50, reader=mock_reader, writer=mock_writer)
+    p.location = test_zone
+    test_zone._contents.append(p)
+    return p
 
 
 @pytest.fixture(autouse=True)
-def clean_state(mock_world):
+def clean_state(test_zone):
     """Clean global state before/after each test."""
-    fly.world = mock_world
-    look.world = mock_world
-    movement.world = mock_world
+    fly.world = test_zone
+    look.world = test_zone
     players.clear()
     active_effects.clear()
     yield
@@ -82,7 +88,7 @@ async def test_fly_toggles_off(player, mock_writer):
 
 
 @pytest.mark.asyncio
-async def test_fly_toggle_on_notifies_nearby(player):
+async def test_fly_toggle_on_notifies_nearby(player, test_zone):
     """Others see liftoff message."""
     players[player.name] = player
 
@@ -96,6 +102,8 @@ async def test_fly_toggle_on_notifies_nearby(player):
         reader=MagicMock(),
         writer=other_writer,
     )
+    other.location = test_zone
+    test_zone._contents.append(other)
     players[other.name] = other
 
     await fly.cmd_fly(player, "")
@@ -105,7 +113,7 @@ async def test_fly_toggle_on_notifies_nearby(player):
 
 
 @pytest.mark.asyncio
-async def test_fly_toggle_off_notifies_nearby(player):
+async def test_fly_toggle_off_notifies_nearby(player, test_zone):
     """Others see landing message."""
     players[player.name] = player
     player.flying = True
@@ -120,6 +128,8 @@ async def test_fly_toggle_off_notifies_nearby(player):
         reader=MagicMock(),
         writer=other_writer,
     )
+    other.location = test_zone
+    test_zone._contents.append(other)
     players[other.name] = other
 
     await fly.cmd_fly(player, "")
@@ -279,13 +289,14 @@ async def test_fly_bad_direction_gives_error(player, mock_writer):
 
 
 @pytest.mark.asyncio
-async def test_fly_triggers_look(player, mock_world):
+async def test_fly_triggers_look(player, test_zone):
     """Flying should auto-look at the destination."""
     players[player.name] = player
     player.flying = True
     await fly.cmd_fly(player, "east")
 
-    assert mock_world.get_viewport.called
+    # look was called (check that writer was written to)
+    assert player.writer.write.called
 
 
 @pytest.mark.asyncio
diff --git a/tests/test_mob_ai.py b/tests/test_mob_ai.py
index f8382f7..1fab528 100644
--- a/tests/test_mob_ai.py
+++ b/tests/test_mob_ai.py
@@ -6,7 +6,6 @@ from unittest.mock import AsyncMock, MagicMock
 
 import pytest
 
-import mudlib.commands.movement as movement_mod
 from mudlib.combat import commands as combat_commands
 from mudlib.combat.encounter import CombatState
 from mudlib.combat.engine import (
@@ -22,6 +21,7 @@ from mudlib.mobs import (
     spawn_mob,
 )
 from mudlib.player import Player, players
+from mudlib.zone import Zone
 
 
 @pytest.fixture(autouse=True)
@@ -36,21 +36,49 @@ def clear_state():
     players.clear()
 
 
+@pytest.fixture
+def test_zone():
+    """Create a test zone for entities."""
+    terrain = [["." for _ in range(256)] for _ in range(256)]
+    zone = Zone(
+        name="testzone",
+        width=256,
+        height=256,
+        toroidal=True,
+        terrain=terrain,
+        impassable=set(),
+    )
+    return zone
+
+
 @pytest.fixture(autouse=True)
-def mock_world():
-    """Inject a mock world for movement and combat commands."""
-    fake_world = MagicMock()
-    fake_world.width = 256
-    fake_world.height = 256
-    old_movement = movement_mod.world
+def inject_world_for_combat(test_zone):
+    """Inject test_zone into combat commands (still uses module-level world)."""
     old_combat = combat_commands.world
-    movement_mod.world = fake_world
-    combat_commands.world = fake_world
-    yield fake_world
-    movement_mod.world = old_movement
+    combat_commands.world = test_zone
+    yield test_zone
     combat_commands.world = old_combat
 
 
+@pytest.fixture(autouse=True)
+def auto_zone_mobs(test_zone, monkeypatch):
+    """Monkeypatch spawn_mob to automatically add mobs to test_zone."""
+    original_spawn = spawn_mob
+
+    def spawn_and_zone(template, x, y):
+        mob = original_spawn(template, x, y)
+        mob.location = test_zone
+        test_zone._contents.append(mob)
+        return mob
+
+    monkeypatch.setattr("mudlib.mobs.spawn_mob", spawn_and_zone)
+    # Also patch it in the test module's import
+    import mudlib.mob_ai as mob_ai_mod
+
+    if hasattr(mob_ai_mod, "spawn_mob"):
+        monkeypatch.setattr(mob_ai_mod, "spawn_mob", spawn_and_zone)
+
+
 @pytest.fixture
 def mock_writer():
     writer = MagicMock()
@@ -65,8 +93,10 @@ def mock_reader():
 
 
 @pytest.fixture
-def player(mock_reader, mock_writer):
+def player(mock_reader, mock_writer, test_zone):
     p = Player(name="Goku", x=0, y=0, reader=mock_reader, writer=mock_writer)
+    p.location = test_zone
+    test_zone._contents.append(p)
     players[p.name] = p
     return p
 
diff --git a/tests/test_mobs.py b/tests/test_mobs.py
index b4a5ed4..aaf52b9 100644
--- a/tests/test_mobs.py
+++ b/tests/test_mobs.py
@@ -5,7 +5,6 @@ from unittest.mock import AsyncMock, MagicMock
 
 import pytest
 
-import mudlib.commands.movement as movement_mod
 from mudlib.combat import commands as combat_commands
 from mudlib.combat.encounter import CombatState
 from mudlib.combat.engine import active_encounters, get_encounter
@@ -20,6 +19,7 @@ from mudlib.mobs import (
     spawn_mob,
 )
 from mudlib.player import Player, players
+from mudlib.zone import Zone
 
 
 @pytest.fixture(autouse=True)
@@ -34,21 +34,44 @@ def clear_state():
     players.clear()
 
 
+@pytest.fixture
+def test_zone():
+    """Create a test zone for entities."""
+    terrain = [["." for _ in range(256)] for _ in range(256)]
+    zone = Zone(
+        name="testzone",
+        width=256,
+        height=256,
+        toroidal=True,
+        terrain=terrain,
+        impassable=set(),
+    )
+    return zone
+
+
 @pytest.fixture(autouse=True)
-def mock_world():
-    """Inject a mock world for movement and combat commands."""
-    fake_world = MagicMock()
-    fake_world.width = 256
-    fake_world.height = 256
-    old_movement = movement_mod.world
+def inject_world_for_combat(test_zone):
+    """Inject test_zone into combat commands (still uses module-level world)."""
     old_combat = combat_commands.world
-    movement_mod.world = fake_world
-    combat_commands.world = fake_world
-    yield fake_world
-    movement_mod.world = old_movement
+    combat_commands.world = test_zone
+    yield test_zone
     combat_commands.world = old_combat
 
 
+@pytest.fixture(autouse=True)
+def auto_zone_mobs(test_zone, monkeypatch):
+    """Monkeypatch spawn_mob to automatically add mobs to test_zone."""
+    original_spawn = spawn_mob
+
+    def spawn_and_zone(template, x, y):
+        mob = original_spawn(template, x, y)
+        mob.location = test_zone
+        test_zone._contents.append(mob)
+        return mob
+
+    monkeypatch.setattr("mudlib.mobs.spawn_mob", spawn_and_zone)
+
+
 @pytest.fixture
 def goblin_toml(tmp_path):
     """Create a goblin TOML file."""
diff --git a/tests/test_rest.py b/tests/test_rest.py
index 40a5407..f5a8c6d 100644
--- a/tests/test_rest.py
+++ b/tests/test_rest.py
@@ -4,10 +4,10 @@ from unittest.mock import AsyncMock, MagicMock
 
 import pytest
 
-import mudlib.commands.movement as movement_mod
 from mudlib.commands.rest import cmd_rest
 from mudlib.player import Player, players
 from mudlib.resting import process_resting
+from mudlib.zone import Zone
 
 
 @pytest.fixture(autouse=True)
@@ -18,16 +18,19 @@ def clear_state():
     players.clear()
 
 
-@pytest.fixture(autouse=True)
-def mock_world():
-    """Inject a mock world for send_nearby_message."""
-    fake_world = MagicMock()
-    fake_world.width = 256
-    fake_world.height = 256
-    old = movement_mod.world
-    movement_mod.world = fake_world
-    yield fake_world
-    movement_mod.world = old
+@pytest.fixture
+def test_zone():
+    """Create a test zone for players."""
+    terrain = [["." for _ in range(256)] for _ in range(256)]
+    zone = Zone(
+        name="testzone",
+        width=256,
+        height=256,
+        toroidal=True,
+        terrain=terrain,
+        impassable=set(),
+    )
+    return zone
 
 
 @pytest.fixture
@@ -44,15 +47,19 @@ def mock_reader():
 
 
 @pytest.fixture
-def player(mock_reader, mock_writer):
+def player(mock_reader, mock_writer, test_zone):
     p = Player(name="Goku", x=0, y=0, reader=mock_reader, writer=mock_writer)
+    p.location = test_zone
+    test_zone._contents.append(p)
     players[p.name] = p
     return p
 
 
 @pytest.fixture
-def nearby_player(mock_reader, mock_writer):
+def nearby_player(mock_reader, mock_writer, test_zone):
     p = Player(name="Vegeta", x=0, y=0, reader=mock_reader, writer=mock_writer)
+    p.location = test_zone
+    test_zone._contents.append(p)
     players[p.name] = p
     return p
 
diff --git a/tests/test_variant_prefix.py b/tests/test_variant_prefix.py
index 1ad890a..775430f 100644
--- a/tests/test_variant_prefix.py
+++ b/tests/test_variant_prefix.py
@@ -5,11 +5,11 @@ from unittest.mock import AsyncMock, MagicMock
 
 import pytest
 
-import mudlib.commands.movement as movement_mod
 from mudlib.combat import commands as combat_commands
 from mudlib.combat.engine import active_encounters
 from mudlib.combat.moves import load_moves
 from mudlib.player import Player, players
+from mudlib.zone import Zone
 
 
 @pytest.fixture(autouse=True)
@@ -22,16 +22,28 @@ def clear_state():
     players.clear()
 
 
+@pytest.fixture
+def test_zone():
+    """Create a test zone for players."""
+    terrain = [["." for _ in range(256)] for _ in range(256)]
+    zone = Zone(
+        name="testzone",
+        width=256,
+        height=256,
+        toroidal=True,
+        terrain=terrain,
+        impassable=set(),
+    )
+    return zone
+
+
 @pytest.fixture(autouse=True)
-def mock_world():
-    """Inject a mock world for send_nearby_message."""
-    fake_world = MagicMock()
-    fake_world.width = 256
-    fake_world.height = 256
-    old = movement_mod.world
-    movement_mod.world = fake_world
-    yield fake_world
-    movement_mod.world = old
+def inject_world_for_combat(test_zone):
+    """Inject test_zone into combat commands (still uses module-level world)."""
+    old_combat = combat_commands.world
+    combat_commands.world = test_zone
+    yield test_zone
+    combat_commands.world = old_combat
 
 
 @pytest.fixture
@@ -48,15 +60,19 @@ def mock_reader():
 
 
 @pytest.fixture
-def player(mock_reader, mock_writer):
+def player(mock_reader, mock_writer, test_zone):
     p = Player(name="Goku", x=0, y=0, reader=mock_reader, writer=mock_writer)
+    p.location = test_zone
+    test_zone._contents.append(p)
     players[p.name] = p
     return p
 
 
 @pytest.fixture
-def target(mock_reader, mock_writer):
+def target(mock_reader, mock_writer, test_zone):
     t = Player(name="Vegeta", x=0, y=0, reader=mock_reader, writer=mock_writer)
+    t.location = test_zone
+    test_zone._contents.append(t)
     players[t.name] = t
     return t