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import sys
import pytest
from sdl2.ext.ebs import Entity, System, Applicator, World
class Position(object):
def __init__(self, x=0, y=0):
self.x = x
self.y = y
def __eq__(self, other):
return self.x == other.x and self.y == other.y
class Movement(object):
def __init__(self, vx=0, vy=0):
self.vx = vx
self.vy = vy
class PositionEntity(Entity):
def __init__(self, world, x=0, y=0):
self.position = Position(x, y)
class MovingEntity(Entity):
def __init__(self, world, x=0, y=0, vx=0, vy=0):
self.position = Position(x, y)
self.movement = Movement(vx, vy)
class PosEntity(Entity):
def __init__(self, world, x=0, y=0):
self.pos = Position(x, y)
class PositionSystem(System):
def __init__(self):
super(PositionSystem, self).__init__()
self.componenttypes = (Position,)
def process(self, world, components):
for c in components:
c.x += 1
c.y += 1
class MovementApplicator(Applicator):
def __init__(self):
super(MovementApplicator, self).__init__()
self.componenttypes = (Position, Movement)
def process(self, world, componentsets):
for p, m in componentsets:
p.x += m.vx
p.y += m.vy
class TestSDL2ExtEBS(object):
__tags__ = ["ebs", "sdl2ext"]
def test_Entity(self):
world = World()
world.add_system(PositionSystem())
e = Entity(world)
e2 = Entity(world)
assert isinstance(e, Entity)
assert isinstance(e2, Entity)
assert e != e2
p = PositionEntity(world)
assert isinstance(p, PositionEntity)
assert isinstance(p, Entity)
def test_Entity_id(self):
world = World()
ent1 = Entity(world)
ent2 = Entity(world)
assert ent1.id != ent2.id
def test_Entity_world(self):
world = World()
world2 = World()
ent1 = Entity(world)
ent2 = Entity(world2)
assert ent1.world == world
assert ent1.world != world2
assert ent2.world == world2
assert ent2.world != world
assert ent1.world != ent2.world
def test_Entity_delete(self):
w = World()
e1 = Entity(w)
e2 = Entity(w)
assert len(w.entities) == 2
e1.delete()
assert len(w.entities) == 1
e2.delete()
assert len(w.entities) == 0
# The next two should have no effect
e1.delete()
e2.delete()
def test_Entity__inheritance(self):
world = World()
pos1 = PositionEntity(world)
pos2 = PositionEntity(world, 10, 10)
for p in (pos1, pos2):
assert isinstance(p, PositionEntity)
assert isinstance(p, Entity)
assert isinstance(p.position, Position)
def test_Entity__access(self):
world = World()
pos1 = PositionEntity(world)
pos2 = PosEntity(world)
pos1.position.x = 10
# components are _always_ identified by a lower-case class name.
def sx(p, v):
p.pos.x = v
with pytest.raises(AttributeError):
sx(pos2, 10)
def test_World(self):
w = World()
assert isinstance(w, World)
def test_World_add_remove_system(self):
world = World()
assert isinstance(world, World)
class SimpleSystem(object):
def __init__(self):
self.componenttypes = (Position,)
def process(self, world, components):
pass
for method in (world.add_system, world.remove_system):
for val in (None, "Test", Position, Entity(world)):
with pytest.raises(ValueError):
method(val)
psystem = SimpleSystem()
world.add_system(psystem)
assert len(world.systems) != 0
assert psystem in world.systems
world.remove_system(psystem)
assert len(world.systems) == 0
assert psystem not in world.systems
psystem = PositionSystem()
world.add_system(psystem)
assert len(world.systems) != 0
assert psystem in world.systems
entity = PositionEntity(world)
assert isinstance(entity.position, Position)
world.remove_system(psystem)
assert len(world.systems) == 0
assert psystem not in world.systems
# The data must stay intact in the world, even if the processing
# system has been removed.
assert isinstance(entity.position, Position)
def test_World_entities(self):
w = World()
assert len(w.entities) == 0
for x in range(100):
Entity(w)
assert len(w.entities) == 100
def test_World_delete(self):
w = World()
e1 = Entity(w)
e2 = Entity(w)
assert len(w.entities) == 2
w.delete(e1)
assert len(w.entities) == 1
w.delete(e2)
assert len(w.entities) == 0
# The next two should have no effect
w.delete(e1)
w.delete(e2)
def test_World_delete_entities(self):
w = World()
e1 = Entity(w)
e2 = Entity(w)
assert len(w.entities) == 2
w.delete_entities((e1, e2))
assert len(w.entities) == 0
# The next should have no effect
w.delete_entities((e1, e2))
def test_World_get_entities(self):
w = World()
e1 = PositionEntity(w, 1, 1)
e2 = PositionEntity(w, 1, 2)
assert len(w.get_entities(e1.position)) == 1
e2.position.y = 1
assert len(w.get_entities(e1.position)) == 2
def test_System(self):
world = World()
with pytest.raises(ValueError):
world.add_system(None)
with pytest.raises(ValueError):
world.add_system(1234)
with pytest.raises(ValueError):
world.add_system("Test")
class ErrornousSystem(System):
def __init__(self):
super(ErrornousSystem, self).__init__()
esystem = ErrornousSystem()
# No component types defined.
with pytest.raises(ValueError):
world.add_system(esystem)
assert len(world.systems) == 0
psystem = PositionSystem()
world.add_system(psystem)
assert psystem in world.systems
def test_System_process(self):
world = World()
class ErrornousSystem(System):
def __init__(self):
super(ErrornousSystem, self).__init__()
self.componenttypes = (Position,)
esystem = ErrornousSystem()
world.add_system(esystem)
for x in range(10):
PositionEntity(world)
assert esystem in world.systems
with pytest.raises(NotImplementedError):
world.process()
world2 = World()
psystem = PositionSystem()
world2.add_system(psystem)
for x in range(10):
PositionEntity(world2)
assert psystem in world2.systems
world2.process()
for c in world2.components[Position].values():
assert c.x == 1
assert c.y == 1
world2.process()
for c in world2.components[Position].values():
assert c.x == 2
assert c.y == 2
def test_Applicator(self):
world = World()
class ErrornousApplicator(Applicator):
def __init__(self):
super(ErrornousApplicator, self).__init__()
eapplicator = ErrornousApplicator()
# No component types defined.
with pytest.raises(ValueError):
world.add_system(eapplicator)
assert len(world.systems) == 0
mapplicator = MovementApplicator()
world.add_system(mapplicator)
assert mapplicator in world.systems
def test_Applicator_process(self):
world = World()
class ErrornousApplicator(Applicator):
def __init__(self):
super(ErrornousApplicator, self).__init__()
self.componenttypes = (Position, Movement)
eapplicator = ErrornousApplicator()
world.add_system(eapplicator)
for x in range(10):
MovingEntity(world)
assert eapplicator in world.systems
with pytest.raises(NotImplementedError):
world.process()
world2 = World()
mapplicator = MovementApplicator()
world2.add_system(mapplicator)
for x in range(10):
MovingEntity(world2, vx=1, vy=1)
assert mapplicator in world2.systems
world2.process()
for c in world2.components[Position].values():
assert c.x == 1
assert c.y == 1
world2.process()
for c in world2.components[Position].values():
assert c.x == 2
assert c.y == 2
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