Add unit tests for line of sight

tests/unit2/test_line_of_sight.py

@@ -0,0 +1,41 @@
+import arcade
+
+def test_line_of_sight():
+    player = arcade.Sprite(":resources:images/animated_characters/female_person/femalePerson_idle.png")
+    player.center_x = 50
+    player.center_y = 350
+
+    enemy = arcade.Sprite(":resources:images/animated_characters/female_person/femalePerson_idle.png")
+    enemy.center_x = 150
+    enemy.center_y = 350
+
+    wall_list = arcade.SpriteList(use_spatial_hash=True)
+
+    result = arcade.has_line_of_sight(player.position, enemy.position, wall_list)
+    assert result
+
+    result = arcade.has_line_of_sight(player.position, enemy.position, wall_list, 2000)
+    assert result
+
+    result = arcade.has_line_of_sight(player.position, enemy.position, wall_list, 20)
+    assert not result
+
+    wall = arcade.Sprite(":resources:images/tiles/grassCenter.png")
+    wall.center_x = 0
+    wall.center_y = 0
+    wall_list.append(wall)
+
+    result = arcade.has_line_of_sight(player.position, enemy.position, wall_list)
+    assert result
+
+    wall.center_x = 100
+    wall.center_y = 350
+
+    result = arcade.has_line_of_sight(player.position, enemy.position, wall_list)
+    assert not result
+
+    wall.center_x = 100
+    wall.center_y = 450
+
+    result = arcade.has_line_of_sight(player.position, enemy.position, wall_list)
+    assert result