objmodel/code/03-customizable/test_objmodel.py - master - telnov.ob/500lines

objmodel/code/03-customizable/test_objmodel.py
240 строк6 KB
Michael DiBernardo
Project format.
16 июл 2015, 14:43
16 июл 2015, 14:4328ba1d6
from objmodel import Class, Instance, TYPE, OBJECT

def test_isinstance():
    # Python code
    class A(object):
        pass
    class B(A):
        pass
    b = B()
    assert isinstance(b, B)
    assert isinstance(b, A)
    assert isinstance(b, object)
    assert not isinstance(b, type)

    # Object model code
    A = Class(name="A", base_class=OBJECT, fields={}, metaclass=TYPE)
    B = Class(name="B", base_class=A, fields={}, metaclass=TYPE)
    b = Instance(B)
    assert b.isinstance(B)
    assert b.isinstance(A)
    assert b.isinstance(OBJECT)
    assert not b.isinstance(TYPE)


def test_read_write_field():
    # Python code
    class A(object):
        pass
    obj = A()
    obj.a = 1
    assert obj.a == 1

    obj.b = 5
    assert obj.a == 1
    assert obj.b == 5

    obj.a = 2
    assert obj.a == 2
    assert obj.b == 5

    # Object model code
    A = Class(name="A", base_class=OBJECT, fields={}, metaclass=TYPE)
    obj = Instance(A)
    obj.write_attr("a", 1)
    assert obj.read_attr("a") == 1

    obj.write_attr("b", 5)
    assert obj.read_attr("a") == 1
    assert obj.read_attr("b") == 5

    obj.write_attr("a", 2)
    assert obj.read_attr("a") == 2
    assert obj.read_attr("b") == 5


def test_read_write_field_class():
    # classes are objects too
    # Python code
    class A(object):
        pass
    A.a = 1
    assert A.a == 1
    A.a = 6
    assert A.a == 6

    # Object model code
    A = Class(name="A", base_class=OBJECT, fields={"a": 1}, metaclass=TYPE)
    assert A.read_attr("a") == 1
    A.write_attr("a", 5)
    assert A.read_attr("a") == 5


def test_callmethod_simple():
    # Python code
    class A(object):
        def f(self):
            return self.x + 1
    obj = A()
    obj.x = 1
    assert obj.f() == 2

    class B(A):
        pass
    obj = B()
    obj.x = 1
    assert obj.f() == 2 # works on subclass too

    # Object model code
    def f_A(self):
        return self.read_attr("x") + 1
    A = Class(name="A", base_class=OBJECT, fields={"f": f_A}, metaclass=TYPE)
    obj = Instance(A)
    obj.write_attr("x", 1)
    assert obj.callmethod("f") == 2

    B = Class(name="B", base_class=A, fields={}, metaclass=TYPE)
    obj = Instance(B)
    obj.write_attr("x", 2)
    assert obj.callmethod("f") == 3


def test_callmethod_subclassing_and_arguments():
    # Python code
    class A(object):
        def g(self, arg):
            return self.x + arg
    obj = A()
    obj.x = 1
    assert obj.g(4) == 5

    class B(A):
        def g(self, arg):
            return self.x + arg * 2
    obj = B()
    obj.x = 4
    assert obj.g(4) == 12

    # Object model code
    def g_A(self, arg):
        return self.read_attr("x") + arg
    A = Class(name="A", base_class=OBJECT, fields={"g": g_A}, metaclass=TYPE)
    obj = Instance(A)
    obj.write_attr("x", 1)
    assert obj.callmethod("g", 4) == 5

    def g_B(self, arg):
        return self.read_attr("x") + arg * 2
    B = Class(name="B", base_class=A, fields={"g": g_B}, metaclass=TYPE)
    obj = Instance(B)
    obj.write_attr("x", 4)
    assert obj.callmethod("g", 4) == 12


def test_bound_method():
    # Python code
    class A(object):
        def f(self, a):
            return self.x + a + 1
    obj = A()
    obj.x = 2
    m = obj.f
    assert m(4) == 7

    class B(A):
        pass
    obj = B()
    obj.x = 1
    m = obj.f
    assert m(10) == 12 # works on subclass too

    # Object model code
    def f_A(self, a):
        return self.read_attr("x") + a + 1
    A = Class(name="A", base_class=OBJECT, fields={"f": f_A}, metaclass=TYPE)
    obj = Instance(A)
    obj.write_attr("x", 2)
    m = obj.read_attr("f")
    assert m(4) == 7

    B = Class(name="B", base_class=A, fields={}, metaclass=TYPE)
    obj = Instance(B)
    obj.write_attr("x", 1)
    m = obj.read_attr("f")
    assert m(10) == 12

# ____________________________________________________________
# new tests

def test_getattr():
    # Python code
    class A(object):
        def __getattr__(self, name):
            if name == "fahrenheit":
                return self.celsius * 9. / 5. + 32
            raise AttributeError(name)

        def __setattr__(self, name, value):
            if name == "fahrenheit":
                self.celsius = (value - 32) * 5. / 9.
            else:
                # call the base implementation
                object.__setattr__(self, name, value)
    obj = A()
    obj.celsius = 30
    assert obj.fahrenheit == 86 # test __getattr__
    obj.celsius = 40
    assert obj.fahrenheit == 104

    obj.fahrenheit = 86 # test __setattr__
    assert obj.celsius == 30
    assert obj.fahrenheit == 86

    # Object model code
    def __getattr__(self, name):
        if name == "fahrenheit":
            return self.read_attr("celsius") * 9. / 5. + 32
        raise AttributeError(name)
    def __setattr__(self, name, value):
        if name == "fahrenheit":
            self.write_attr("celsius", (value - 32) * 5. / 9.)
        else:
            # call the base implementation
            OBJECT.read_attr("__setattr__")(self, name, value)

    A = Class(name="A", base_class=OBJECT,
              fields={"__getattr__": __getattr__, "__setattr__": __setattr__},
              metaclass=TYPE)
    obj = Instance(A)
    obj.write_attr("celsius", 30)
    assert obj.read_attr("fahrenheit") == 86 # test __getattr__
    obj.write_attr("celsius", 40)
    assert obj.read_attr("fahrenheit") == 104
    obj.write_attr("fahrenheit", 86) # test __setattr__
    assert obj.read_attr("celsius") == 30
    assert obj.read_attr("fahrenheit") == 86


def test_get():
    # Python code
    class FahrenheitGetter(object):
        def __get__(self, inst, cls):
            return inst.celsius * 9. / 5. + 32

    class A(object):
        fahrenheit = FahrenheitGetter()
    obj = A()
    obj.celsius = 30
    assert obj.fahrenheit == 86

    # Object model code
    class FahrenheitGetter(object):
        def __get__(self, inst, cls):
            return inst.read_attr("celsius") * 9. / 5. + 32

    A = Class(name="A", base_class=OBJECT,
              fields={"fahrenheit": FahrenheitGetter()},
              metaclass=TYPE)
    obj = Instance(A)
    obj.write_attr("celsius", 30)
    assert obj.read_attr("fahrenheit") == 86