diff --git a/client/scripts/autoloads/sim_bridge.gd b/client/scripts/autoloads/sim_bridge.gd
index 604ab2514..98aad66b8 100644
--- a/client/scripts/autoloads/sim_bridge.gd
+++ b/client/scripts/autoloads/sim_bridge.gd
@@ -250,6 +250,10 @@ static func _action_enum_to_wire(action: int) -> String:
 
 # Dynamic test snapshot — processes queued inputs to move player, generates
 # visibility based on current position. Matches Protocol.decode_snapshot() format.
+# NOTE: Test coordinate space (player at 10,10; NPC at 12,9; wall at 12,10)
+# is intentionally decoupled from the E2E proof room (player at 16,16; NPC at
+# 16,13; wall at 16,14). This ensures standalone tests don't depend on server
+# map layout and can exercise the rendering pipeline independently.
 func _test_snapshot() -> Dictionary:
 	_test_tick += 1
 
@@ -276,7 +280,7 @@ func _test_snapshot() -> Dictionary:
 		"visibility": "Forward",
 	}]
 
-	# NPC at (12, 9) — visible if within range and not blocked by wall at (12, 9)
+	# NPC at (12, 9) — visible if within range and not blocked by wall at (12, 10)
 	var npc_pos := Vector2i(12, 9)
 	var npc_dist := absi(px - npc_pos.x) + absi(py - npc_pos.y)
 	if npc_dist <= 4 and _test_has_los(Vector2i(px, py), npc_pos):
diff --git a/client/tests/test_snapshot_parsing.gd b/client/tests/test_snapshot_parsing.gd
index 7c15c7657..3fd78c17e 100644
--- a/client/tests/test_snapshot_parsing.gd
+++ b/client/tests/test_snapshot_parsing.gd
@@ -51,11 +51,25 @@ func test_missing_fields_partial_update() -> void:
 	assert_that(GameState.player_position).is_equal(Vector2(10, 15))
 	assert_that(GameState.current_tick).is_equal(2)
 
+func test_sim_bridge_los_clear_path() -> void:
+	# No wall between (10,10) and (10,8) — clear LOS
+	assert_that(SimBridge._test_has_los(Vector2i(10, 10), Vector2i(10, 8))).is_true()
+
+func test_sim_bridge_los_blocked_by_wall() -> void:
+	# Wall at (12,10) blocks LOS from (10,10) to (12,9) via east path
+	# Direct line from (10,10) → (12,9) passes through (11,10) then (12,10) — wall
+	assert_that(SimBridge._test_has_los(Vector2i(10, 10), Vector2i(14, 10))).is_false()
+
+func test_sim_bridge_los_diagonal() -> void:
+	# Diagonal LOS from (10,10) to (11,9) — no wall in path
+	assert_that(SimBridge._test_has_los(Vector2i(10, 10), Vector2i(11, 9))).is_true()
+
+func test_sim_bridge_los_same_position() -> void:
+	# LOS to self is always true
+	assert_that(SimBridge._test_has_los(Vector2i(10, 10), Vector2i(10, 10))).is_true()
+
 func test_sim_bridge_test_snapshot_deterministic() -> void:
-	SimBridge._test_tick = 0
-	SimBridge._test_player_pos = Vector2i(10, 10)
-	SimBridge._test_facing = "North"
-	SimBridge._test_input_queue.clear()
+	SimBridge.reset_test_state()
 	var snap1 = SimBridge._test_snapshot()
 	var snap2 = SimBridge._test_snapshot()
 
diff --git a/client/tests/test_sprint2_proof.gd b/client/tests/test_sprint2_proof.gd
index ce35da77c..21a0164d6 100644
--- a/client/tests/test_sprint2_proof.gd
+++ b/client/tests/test_sprint2_proof.gd
@@ -91,6 +91,9 @@ func _connect_to_server() -> bool:
 	_bridge = LocalBridge.new()
 	var elapsed := 0.0
 	while elapsed < CONNECT_TIMEOUT:
+		if _server_pid > 0 and not OS.is_process_running(_server_pid):
+			push_warning("Server process died during connection")
+			return false
 		if _bridge.get_status() == StreamPeerTCP.STATUS_NONE:
 			_bridge.connect_to_server("127.0.0.1", _test_port)
 		_bridge.poll()
@@ -174,6 +177,8 @@ func test_proof_corner_reveal() -> void:
 	var npc_found := false
 	for entity in snapshot.entities:
 		if entity.kind.variant == "Npc":
+			assert_float(entity.x).is_equal_approx(16.5, 0.001)
+			assert_float(entity.y).is_equal_approx(13.5, 0.001)
 			npc_found = true
 			break
 	assert_that(npc_found).is_true()