def test_callback_resolution():
d = Deferred()
d.add_callback(lambda r: fail(Exception(r + "b")))
d.add_errback(lambda e: e.value.args[0] + "c")
d.add_callbacks(lambda r: r + "d", lambda e: e.value.args[0] + 'f')
d.callback("a")
assert d.result == "abcd"
def test_callback_resolution():
d = Deferred()
d.add_callback(lambda r: fail(Exception(r + "b")))
d.add_errback(lambda e: e.value.args[0] + "c")
d.add_callbacks(lambda r: r + "d", lambda e: e.value.args[0] + 'f')
d.callback("a")
assert d.result == "abcd"
def test_errback_chain():
holder = []
d = Deferred()
e = Exception('a')
d.add_callbacks(holder.append, lambda e: Exception(e.value.args[0] + 'b'))
d.add_callbacks(holder.append, lambda e: Exception(e.value.args[0] + 'c'))
d.errback(e)
assert d.result.value.args[0] == 'abc'
assert len(holder) == 0
def test_errback_chain():
holder = []
d = Deferred()
e = Exception('a')
d.add_callbacks(holder.append, lambda e: Exception(e.value.args[0] + 'b'))
d.add_callbacks(holder.append, lambda e: Exception(e.value.args[0] + 'c'))
d.errback(e)
assert d.result.value.args[0] == 'abc'
assert len(holder) == 0
def test_callback_resolution_weaving():
d = Deferred()
d.add_callbacks(lambda r: fail(Exception(r + "b")),
lambda e: e.value.args[0] + 'w')
d.add_callbacks(lambda e: Exception(e + "x"),
lambda e: e.value.args[0] + "c")
d.add_callbacks(lambda r: Exception(r + "d"),
lambda e: e.value.args[0] + 'y')
d.add_callbacks(lambda r: r + "z", lambda e: e.value.args[0] + 'e')
d.callback("a")
assert d.result == "abcde"
def test_callback_resolution_weaving_2():
d = Deferred()
d.add_callbacks(lambda r: fail(Exception(r + "b")),
lambda e: e.value.args[0] + 'w')
d.add_callbacks(lambda e: Exception(e + "x"),
lambda e: e.value.args[0] + "c")
d.add_callbacks(lambda r: Exception(r + "d"),
lambda e: e.value.args[0] + 'y')
d.add_callbacks(lambda r: fail(ValueError(r + "z")),
lambda e: e.value.args[0] + 'e')
d.errback(Exception('v'))
assert isinstance(d.result, DeferredException)
assert isinstance(d.result.value, ValueError)
assert d.result.value.args[0] == "vwxyz"
def test_callback_resolution_weaving():
d = Deferred()
d.add_callbacks(lambda r: fail(Exception(r + "b")), lambda e: e.value.args[0] + 'w')
d.add_callbacks(lambda e: Exception(e + "x"), lambda e: e.value.args[0] + "c")
d.add_callbacks(lambda r: Exception(r + "d"), lambda e: e.value.args[0] + 'y')
d.add_callbacks(lambda r: r + "z", lambda e: e.value.args[0] + 'e')
d.callback("a")
assert d.result == "abcde"
def test_callback_resolution_weaving_2():
d = Deferred()
d.add_callbacks(lambda r: fail(Exception(r + "b")), lambda e: e.value.args[0] + 'w')
d.add_callbacks(lambda e: Exception(e + "x"), lambda e: e.value.args[0] + "c")
d.add_callbacks(lambda r: Exception(r + "d"), lambda e: e.value.args[0] + 'y')
d.add_callbacks(lambda r: fail(ValueError(r + "z")), lambda e: e.value.args[0] + 'e')
d.errback(Exception('v'))
assert isinstance(d.result, DeferredException)
assert isinstance(d.result.value, ValueError)
assert d.result.value.args[0] == "vwxyz"
def test_callbacks_and_errbacks_return_original_deferred():
d = Deferred()
assert d.add_callback(lambda a: None) is d
assert d.add_errback(lambda a: None) is d
assert d.add_callbacks(lambda a: None, lambda a: None) is d
def test_callbacks_and_errbacks_return_original_deferred():
d = Deferred()
assert d.add_callback(lambda a: None) is d
assert d.add_errback(lambda a: None) is d
assert d.add_callbacks(lambda a: None, lambda a: None) is d