def test_Headers_pop():
h = Headers()
pytest.raises(KeyError, h.pop, 'foo')
assert h.pop('foo', None) is None
h['foo'] = 'bar'
assert h.pop('foo') == 'bar'
pytest.raises(KeyError, h.pop, 'foo')
def test_Headers_copy():
orig = Headers()
orig['Foo'] = 'bar'
copy = orig.copy()
assert copy is not orig
assert orig['foo'] == copy['foo']
orig['foo'] = 'baz'
assert copy['foo'] == 'bar'
def test_Headers_add_header():
h = Headers()
h.add_header('Cookie', 'foo')
assert len(h) == 1
assert h['cookie'] == 'foo'
h.add_header('Cookie', 'bar')
assert len(h) == 1
assert h['cookie'] == 'foo, bar'
def test_Headers_repr():
assert repr(Headers()) == '{}'
def test_Headers_update_args_kwargs():
h = Headers()
h['foo'] = 'bar'
h.update({'foo': 'baz'}, foo='qux')
assert h['foo'] == 'qux'
def test_Headers_update_kwargs():
h = Headers()
h['foo'] = 'bar'
h.update(foo='baz')
assert h['foo'] == 'baz'
def test_Headers_update_list():
h = Headers()
h['foo'] = 'bar'
h.update([('foo', 'baz')])
assert h['foo'] == 'baz'
def test_Headers_update_dict():
h = Headers()
h['foo'] = 'bar'
h.update({'foo': 'baz'})
assert h['foo'] == 'baz'
def test_Headers_update_TypeError():
h = Headers()
pytest.raises(TypeError, h.update, None, None)
pytest.raises(TypeError, h.update, None)