def test_object_graph_partial_use():
"""
Partial initialization succeeds partially and is recoverable.
"""
registry = Registry()
create_first = Mock()
create_first.return_value = "first"
create_second = Mock()
create_second.side_effect = [Exception, "second"]
create_third = Mock()
create_third.side_effect = "third"
registry.bind("first", create_first)
registry.bind("second", create_second)
registry.bind("third", create_third)
graph = create_object_graph("test", registry=registry)
# exception raised from initial call to create_second
assert_that(
calling(graph.use).with_args("first", "second", "third"),
raises(Exception))
# first and second were called, but not third
assert_that(create_first.call_count, is_(equal_to(1)))
assert_that(create_second.call_count, is_(equal_to(1)))
assert_that(create_third.call_count, is_(equal_to(0)))
# second call succeeds
[first, second, third] = graph.use("first", "second", "third")
# first was not called, second was called again, and third called for the first time
assert_that(create_first.call_count, is_(equal_to(1)))
assert_that(create_second.call_count, is_(equal_to(2)))
assert_that(create_third.call_count, is_(equal_to(1)))
def test_object_graph_partial_use():
"""
Partial initialization succeeds partially and is recoverable.
"""
registry = Registry()
create_first = Mock()
create_first.return_value = "first"
create_second = Mock()
create_second.side_effect = [Exception, "second"]
create_third = Mock()
create_third.side_effect = "third"
registry.bind("first", create_first)
registry.bind("second", create_second)
registry.bind("third", create_third)
graph = create_object_graph("test", registry=registry)
# exception raised from initial call to create_second
assert_that(calling(graph.use).with_args("first", "second", "third"), raises(Exception))
# first and second were called, but not third
assert_that(create_first.call_count, is_(equal_to(1)))
assert_that(create_second.call_count, is_(equal_to(1)))
assert_that(create_third.call_count, is_(equal_to(0)))
# second call succeeds
[first, second, third] = graph.use("first", "second", "third")
# first was not called, second was called again, and third called for the first time
assert_that(create_first.call_count, is_(equal_to(1)))
assert_that(create_second.call_count, is_(equal_to(2)))
assert_that(create_third.call_count, is_(equal_to(1)))
def test_object_graph_use():
"""
Explicitly create a set of components.
"""
graph = create_object_graph(name="test", )
parent, _ = graph.use("parent", "hello_world")
assert_that(parent, is_(instance_of(Parent)))
def test_importing():
"""
Importing can be used to access object graph members.
"""
graph = create_object_graph(name="test", )
graph.use("hello_world")
graph.export("some.module")
from some.module import hello_world
assert_that(hello_world, is_(equal_to("hello world")))
def test_create_object_graph():
"""
Construct an object graph from bound factories and entry points.
"""
graph = create_object_graph(name="test", )
assert_that(graph.child, is_(instance_of(Child)))
assert_that(graph.child.value, is_(equal_to("default_value")))
assert_that(graph.parent, is_(instance_of(Parent)))
assert_that(graph.parent.child, is_(equal_to(graph.child)))
assert_that(graph.hello_world, is_(equal_to("hello world")))
def test_get_component_name_function():
"""
Utility function `get_component_name` works.
"""
graph = create_object_graph(name="test", )
graph.use("parent")
graph.lock()
assert_that(get_component_name(graph, graph.parent),
is_(equal_to("parent")))
def test_importing():
"""
Importing can be used to access object graph members.
"""
graph = create_object_graph(
name="test",
)
graph.use("hello_world")
graph.export("some.module")
from some.module import hello_world
assert_that(hello_world, is_(equal_to("hello world")))
def test_object_graph_use():
"""
Explicitly create a set of components.
"""
graph = create_object_graph(
name="test",
)
parent, _ = graph.use(
"parent",
"hello_world"
)
assert_that(parent, is_(instance_of(Parent)))
def test_create_object_graph():
"""
Construct an object graph from bound factories and entry points.
"""
graph = create_object_graph(
name="test",
)
assert_that(graph.child, is_(instance_of(Child)))
assert_that(graph.child.value, is_(equal_to("default_value")))
assert_that(graph.parent, is_(instance_of(Parent)))
assert_that(graph.parent.child, is_(equal_to(graph.child)))
assert_that(graph.hello_world, is_(equal_to("hello world")))
def test_object_graph_cycle():
"""
Graph cycles are detected.
"""
registry = Registry()
@binding("cycle", registry=registry)
def create_cycle(graph):
return graph.cycle
graph = create_object_graph("test", registry=registry)
assert_that(calling(graph.use).with_args("cycle"), raises(CyclicGraphError))
def test_object_graph_cycle():
"""
Graph cycles are detected.
"""
registry = Registry()
@binding("cycle", registry=registry)
def create_cycle(graph):
return graph.cycle
graph = create_object_graph("test", registry=registry)
assert_that(
calling(graph.use).with_args("cycle"), raises(CyclicGraphError))
def test_object_graph_use():
"""
Explicitly create a set of components.
"""
graph = create_object_graph(name="test", )
parent, _ = graph.use("parent", "hello_world")
assert_that(graph.get('parent'), is_(instance_of(Parent)))
assert_that(parent, is_(instance_of(Parent)))
assert_that(
list(graph.items()),
has_items(
contains("parent", is_(instance_of(Parent))),
contains("child", is_(instance_of(Child))),
contains("hello_world", is_(equal_to("hello world"))),
))
def test_object_graph_locking():
"""
Locking and unlocking a graph effects its ability to create components.
"""
graph = create_object_graph(name="test", )
[parent] = graph.use("parent")
graph.lock()
# can access already created object
assert_that(graph.parent, is_(equal_to(parent)))
# cannot create a new object
assert_that(
calling(graph.use).with_args("hello_world"), raises(LockedGraphError))
graph.unlock()
# can create an object again
[hello_world] = graph.use("hello_world")
assert_that(hello_world, is_(equal_to("hello world")))
def test_object_graph_locking():
"""
Locking and unlocking a graph effects its ability to create components.
"""
graph = create_object_graph(
name="test",
)
[parent] = graph.use("parent")
graph.lock()
# can access already created object
assert_that(graph.parent, is_(equal_to(parent)))
# cannot create a new object
assert_that(calling(graph.use).with_args("hello_world"), raises(LockedGraphError))
graph.unlock()
# can create an object again
[hello_world] = graph.use("hello_world")
assert_that(hello_world, is_(equal_to("hello world")))
def graph():
return create_object_graph(name="example", testing=True)