91 lines
2.0 KiB
Python
91 lines
2.0 KiB
Python
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# -*- coding: utf-8 -*-
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from __future__ import absolute_import, division, print_function
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import pytest
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from attr._make import (
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Attribute,
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_CountingAttr,
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_get_attrs,
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_make_attr,
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s,
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)
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class TestMakeAttr(object):
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"""
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Tests for `_make_attr`.
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"""
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def test_returns_Attr(self):
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"""
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Returns an instance of _Attr.
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"""
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a = _make_attr()
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assert isinstance(a, _CountingAttr)
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def test_catches_ambiguous_defaults(self):
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"""
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Raises ValueError if both default_value and default_factory are
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specified.
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"""
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with pytest.raises(ValueError) as e:
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_make_attr(default_value=42, default_factory=list)
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assert (
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"Specifying both default_value and default_factory is ambiguous."
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== e.value.args[0]
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)
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class TestGetAttrs(object):
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"""
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Tests for `_get_attrs`.
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"""
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def test_normal(self):
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"""
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Returns attributes in correct order.
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"""
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@s
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class C(object):
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z = _make_attr()
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y = _make_attr()
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x = _make_attr()
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assert ["z", "y", "x"] == [name for (name, _) in _get_attrs(C)]
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def test_empty(self):
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"""
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No attributes returns an empty list.
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"""
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@s
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class C(object):
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pass
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assert [] == _get_attrs(C)
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class TestS(object):
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"""
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Tests for the `s` class decorator.
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"""
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def test_sets_attrs(self):
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"""
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Sets the `__attrs_attrs__` class attribute with a list of `Attribute`s.
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"""
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@s
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class C(object):
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x = _make_attr()
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assert "x" == C.__attrs_attrs__[0].name
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assert all(isinstance(a, Attribute) for a in C.__attrs_attrs__)
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def test_empty(self):
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"""
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No attributes, no problems.
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"""
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@s
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class C3(object):
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pass
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assert "<C3()>" == repr(C3())
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assert C3() == C3()
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