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#!/usr/bin/env python
# coding: utf-8
# Copyright (c) Jupyter Development Team.
# Distributed under the terms of the Modified BSD License.
import pytest
from traitlets import HasTraits, TraitError
from ..traittypes import SciType
def test_coercion_validator():
# Test with a squeeze coercion
def truncate(trait, value):
return value[:10]
class Foo(HasTraits):
bar = SciType().valid(truncate)
foo = Foo(bar=list(range(20)))
assert foo.bar == list(range(10))
foo.bar = list(range(10, 40))
assert foo.bar == list(range(10, 20))
def test_validaton_error():
# Test with a squeeze coercion
def maxlen(trait, value):
if len(value) > 10:
raise ValueError('Too long sequence!')
return value
class Foo(HasTraits):
bar = SciType().valid(maxlen)
# Check that it works as expected:
foo = Foo(bar=list(range(5)))
assert foo.bar == list(range(5))
# Check that it fails as expected:
with pytest.raises(TraitError): # Should convert ValueError to TraitError
foo.bar = list(range(10, 40))
assert foo.bar == list(range(5))
# Check that it can again be set correctly
foo = Foo(bar=list(range(5, 10)))
assert foo.bar == list(range(5, 10))
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