nonebot2/tests/test_adapters/test_template.py

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from utils import make_fake_message
def test_message_template():
from nonebot.adapters import MessageTemplate
Message = make_fake_message()
template = MessageTemplate("{a:custom}{b:text}{c:image}", Message)
@template.add_format_spec
def custom(input: str) -> str:
return input + "-custom!"
formatted = template.format(a="test", b="test", c="https://example.com/test")
assert formatted.extract_plain_text() == "test-custom!test"
assert str(formatted) == "test-custom!test[fake:image]"