def test_styled_text_push_context_attribute():
seq = StyledSequence("", {})
seq._enter_iteration()
color = TM.Color("red")
color2 = TM.Color("yellow")
assert seq.context.color != color
original = seq.context.color
seq._context_push({"color": color}, {}, "sequence", 0)
assert seq.context.color == color
seq._context_push({"color": color2}, {}, "sequence", 0)
assert seq.context.color == color2
seq._context_push({}, {"color": None}, "sequence", 0)
assert seq.context.color == color
seq._context_push({}, {"color": None}, "sequence", 0)
assert seq.context.color == original
def test_styled_text_push_context_sequence_attribute():
from copy import copy
seq = StyledSequence("", {})
seq._enter_iteration()
tr1 = TM.Transformer(foreground="red")
tr2 = TM.Transformer(background="yellow")
assert tr1 not in seq.context.pretransformers
original = copy(seq.context.pretransformers)
seq._context_push({"pretransformer": tr1}, {}, "sequence", 0)
assert seq.context.pretransformers[-1].foreground == tr1.foreground
seq._context_push({"pretransformer": tr2}, {}, "sequence", 0)
assert seq.context.pretransformers[-1].background == tr2.background
assert seq.context.pretransformers[-2].foreground == tr1.foreground
seq._context_push({}, {"pretransformer": None}, "sequence", 0)
assert seq.context.pretransformers[-1].foreground == tr1.foreground
seq._context_push({}, {"pretransformer": None}, "sequence", 0)
assert seq.context.pretransformers == original