def test_from_pairs(self):
"""
Construct an enumeration from an iterable of pairs.
"""
pairs = [
(u'foo', u'Foo'),
(u'bar', u'Bar')]
enum = Enum.from_pairs('doc', pairs)
self.assertThat(enum.doc, Equals('doc'))
self.assertThat(enum.as_pairs(), Equals(pairs))
def test_duplicate_values(self):
"""
Constructing an enumeration with duplicate values results in
`ValueError` being raised.
"""
values = [
EnumItem(u'foo', u'Foo'),
EnumItem(u'bar', u'Bar'),
EnumItem(u'foo', u'Not Foo', quux=u'frob')]
self.assertThat(
lambda: Enum('doc', values),
raises(ValueError))
pairs = [(e.value, e.desc) for e in values]
self.assertThat(
lambda: Enum.from_pairs('doc', pairs),
raises(ValueError))
