37 lines
755 B
Python
37 lines
755 B
Python
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"""
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Tests for `attr.converters`.
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"""
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from __future__ import absolute_import
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import pytest
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from attr.converters import optional
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class TestOptional(object):
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"""
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Tests for `optional`.
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"""
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def test_success_with_type(self):
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"""
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Wrapped converter is used as usual if value is not None.
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"""
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c = optional(int)
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assert c("42") == 42
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def test_success_with_none(self):
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"""
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Nothing happens if None.
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"""
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c = optional(int)
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assert c(None) is None
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def test_fail(self):
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"""
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Propagates the underlying conversion error when conversion fails.
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"""
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c = optional(int)
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with pytest.raises(ValueError):
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c("not_an_int")
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