def set_up(self):
self.fx = TypeFixture(INVARIANT)
self.fx_co = TypeFixture(COVARIANT)
self.fx_contra = TypeFixture(CONTRAVARIANT)
def __init__(self) -> None:
super().__init__()
self.fx = TypeFixture()
class SubtypingSuite(Suite):
def set_up(self) -> None:
self.fx = TypeFixture(INVARIANT)
self.fx_contra = TypeFixture(CONTRAVARIANT)
self.fx_co = TypeFixture(COVARIANT)
def test_trivial_cases(self) -> None:
for simple in self.fx_co.void, self.fx_co.a, self.fx_co.o, self.fx_co.b:
self.assert_subtype(simple, simple)
def test_instance_subtyping(self) -> None:
self.assert_strict_subtype(self.fx.a, self.fx.o)
self.assert_strict_subtype(self.fx.b, self.fx.o)
self.assert_strict_subtype(self.fx.b, self.fx.a)
self.assert_not_subtype(self.fx.a, self.fx.d)
self.assert_not_subtype(self.fx.b, self.fx.c)
def test_simple_generic_instance_subtyping_invariant(self) -> None:
self.assert_subtype(self.fx.ga, self.fx.ga)
self.assert_subtype(self.fx.hab, self.fx.hab)
self.assert_not_subtype(self.fx.ga, self.fx.g2a)
self.assert_not_subtype(self.fx.ga, self.fx.gb)
self.assert_not_subtype(self.fx.gb, self.fx.ga)
def test_simple_generic_instance_subtyping_covariant(self) -> None:
self.assert_subtype(self.fx_co.ga, self.fx_co.ga)
self.assert_subtype(self.fx_co.hab, self.fx_co.hab)
self.assert_not_subtype(self.fx_co.ga, self.fx_co.g2a)
self.assert_not_subtype(self.fx_co.ga, self.fx_co.gb)
self.assert_subtype(self.fx_co.gb, self.fx_co.ga)
def test_simple_generic_instance_subtyping_contravariant(self) -> None:
self.assert_subtype(self.fx_contra.ga, self.fx_contra.ga)
self.assert_subtype(self.fx_contra.hab, self.fx_contra.hab)
self.assert_not_subtype(self.fx_contra.ga, self.fx_contra.g2a)
self.assert_subtype(self.fx_contra.ga, self.fx_contra.gb)
self.assert_not_subtype(self.fx_contra.gb, self.fx_contra.ga)
def test_generic_subtyping_with_inheritance_invariant(self) -> None:
self.assert_subtype(self.fx.gsab, self.fx.gb)
self.assert_not_subtype(self.fx.gsab, self.fx.ga)
self.assert_not_subtype(self.fx.gsaa, self.fx.gb)
def test_generic_subtyping_with_inheritance_covariant(self) -> None:
self.assert_subtype(self.fx_co.gsab, self.fx_co.gb)
self.assert_subtype(self.fx_co.gsab, self.fx_co.ga)
self.assert_not_subtype(self.fx_co.gsaa, self.fx_co.gb)
def test_generic_subtyping_with_inheritance_contravariant(self) -> None:
self.assert_subtype(self.fx_contra.gsab, self.fx_contra.gb)
self.assert_not_subtype(self.fx_contra.gsab, self.fx_contra.ga)
self.assert_subtype(self.fx_contra.gsaa, self.fx_contra.gb)
def test_interface_subtyping(self) -> None:
self.assert_subtype(self.fx.e, self.fx.f)
self.assert_equivalent(self.fx.f, self.fx.f)
self.assert_not_subtype(self.fx.a, self.fx.f)
def test_generic_interface_subtyping(self) -> None:
# TODO make this work
self.skip()
fx2 = InterfaceTypeFixture()
self.assert_subtype(fx2.m1, fx2.gfa)
self.assert_not_subtype(fx2.m1, fx2.gfb)
self.assert_equivalent(fx2.gfa, fx2.gfa)
def test_basic_callable_subtyping(self) -> None:
self.assert_strict_subtype(self.fx.callable(self.fx.o, self.fx.d),
self.fx.callable(self.fx.a, self.fx.d))
self.assert_strict_subtype(self.fx.callable(self.fx.d, self.fx.b),
self.fx.callable(self.fx.d, self.fx.a))
self.assert_unrelated(self.fx.callable(self.fx.a, self.fx.a),
self.fx.callable(self.fx.a, self.fx.void))
self.assert_unrelated(
self.fx.callable(self.fx.a, self.fx.a, self.fx.a),
self.fx.callable(self.fx.a, self.fx.a))
def test_default_arg_callable_subtyping(self) -> None:
self.assert_strict_subtype(
self.fx.callable_default(1, self.fx.a, self.fx.d, self.fx.a),
self.fx.callable(self.fx.a, self.fx.d, self.fx.a))
self.assert_strict_subtype(
self.fx.callable_default(1, self.fx.a, self.fx.d, self.fx.a),
self.fx.callable(self.fx.a, self.fx.a))
self.assert_strict_subtype(
self.fx.callable_default(0, self.fx.a, self.fx.d, self.fx.a),
self.fx.callable_default(1, self.fx.a, self.fx.d, self.fx.a))
self.assert_unrelated(
self.fx.callable_default(1, self.fx.a, self.fx.d, self.fx.a),
self.fx.callable(self.fx.d, self.fx.d, self.fx.a))
self.assert_unrelated(
self.fx.callable_default(0, self.fx.a, self.fx.d, self.fx.a),
self.fx.callable_default(1, self.fx.a, self.fx.a, self.fx.a))
self.assert_unrelated(
self.fx.callable_default(1, self.fx.a, self.fx.a),
self.fx.callable(self.fx.a, self.fx.a, self.fx.a))
def test_var_arg_callable_subtyping_1(self) -> None:
self.assert_strict_subtype(
self.fx.callable_var_arg(0, self.fx.a, self.fx.a),
self.fx.callable_var_arg(0, self.fx.b, self.fx.a))
def test_var_arg_callable_subtyping_2(self) -> None:
self.assert_strict_subtype(
self.fx.callable_var_arg(0, self.fx.a, self.fx.a),
self.fx.callable(self.fx.b, self.fx.a))
def test_var_arg_callable_subtyping_3(self) -> None:
self.assert_strict_subtype(
self.fx.callable_var_arg(0, self.fx.a, self.fx.a),
self.fx.callable(self.fx.a))
def test_var_arg_callable_subtyping_4(self) -> None:
self.assert_strict_subtype(
self.fx.callable_var_arg(1, self.fx.a, self.fx.d, self.fx.a),
self.fx.callable(self.fx.b, self.fx.a))
def test_var_arg_callable_subtyping_5(self) -> None:
self.assert_strict_subtype(
self.fx.callable_var_arg(0, self.fx.a, self.fx.d, self.fx.a),
self.fx.callable(self.fx.b, self.fx.a))
def test_var_arg_callable_subtyping_6(self) -> None:
self.assert_strict_subtype(
self.fx.callable_var_arg(0, self.fx.a, self.fx.f, self.fx.d),
self.fx.callable_var_arg(0, self.fx.b, self.fx.e, self.fx.d))
def test_var_arg_callable_subtyping_7(self) -> None:
self.assert_not_subtype(
self.fx.callable_var_arg(0, self.fx.b, self.fx.d),
self.fx.callable(self.fx.a, self.fx.d))
def test_var_arg_callable_subtyping_8(self) -> None:
self.assert_not_subtype(
self.fx.callable_var_arg(0, self.fx.b, self.fx.d),
self.fx.callable_var_arg(0, self.fx.a, self.fx.a, self.fx.d))
self.assert_subtype(
self.fx.callable_var_arg(0, self.fx.a, self.fx.d),
self.fx.callable_var_arg(0, self.fx.b, self.fx.b, self.fx.d))
def test_var_arg_callable_subtyping_9(self) -> None:
self.assert_not_subtype(
self.fx.callable_var_arg(0, self.fx.b, self.fx.b, self.fx.d),
self.fx.callable_var_arg(0, self.fx.a, self.fx.d))
self.assert_subtype(
self.fx.callable_var_arg(0, self.fx.a, self.fx.a, self.fx.d),
self.fx.callable_var_arg(0, self.fx.b, self.fx.d))
def test_type_callable_subtyping(self) -> None:
self.assert_strict_subtype(
self.fx.callable_type(self.fx.d, self.fx.a), self.fx.type_type)
self.assert_strict_subtype(
self.fx.callable_type(self.fx.d, self.fx.b),
self.fx.callable(self.fx.d, self.fx.a))
self.assert_strict_subtype(self.fx.callable_type(self.fx.a, self.fx.b),
self.fx.callable(self.fx.a, self.fx.b))
# IDEA: Maybe add these test cases (they are tested pretty well in type
# checker tests already):
# * more interface subtyping test cases
# * more generic interface subtyping test cases
# * type variables
# * tuple types
# * void type
# * None type
# * any type
# * generic function types
def assert_subtype(self, s: Type, t: Type) -> None:
assert_true(is_subtype(s, t), '{} not subtype of {}'.format(s, t))
def assert_not_subtype(self, s: Type, t: Type) -> None:
assert_true(not is_subtype(s, t), '{} subtype of {}'.format(s, t))
def assert_strict_subtype(self, s: Type, t: Type) -> None:
self.assert_subtype(s, t)
self.assert_not_subtype(t, s)
def assert_equivalent(self, s: Type, t: Type) -> None:
self.assert_subtype(s, t)
self.assert_subtype(t, s)
def assert_unrelated(self, s: Type, t: Type) -> None:
self.assert_not_subtype(s, t)
self.assert_not_subtype(t, s)
class TypeOpsSuite(Suite):
def set_up(self):
self.fx = TypeFixture(INVARIANT)
self.fx_co = TypeFixture(COVARIANT)
self.fx_contra = TypeFixture(CONTRAVARIANT)
# expand_type
def test_trivial_expand(self):
for t in (self.fx.a, self.fx.o, self.fx.t, self.fx.void, self.fx.nonet,
self.tuple(self.fx.a),
self.callable([], self.fx.a, self.fx.a), self.fx.anyt):
self.assert_expand(t, [], t)
self.assert_expand(t, [], t)
self.assert_expand(t, [], t)
def test_expand_naked_type_var(self):
self.assert_expand(self.fx.t, [(1, self.fx.a)], self.fx.a)
self.assert_expand(self.fx.t, [(2, self.fx.a)], self.fx.t)
def test_expand_basic_generic_types(self):
self.assert_expand(self.fx.gt, [(1, self.fx.a)], self.fx.ga)
# IDEA: Add test cases for
# tuple types
# callable types
# multiple arguments
def assert_expand(self, orig, map_items, result):
lower_bounds = {}
for id, t in map_items:
lower_bounds[id] = t
exp = expand_type(orig, lower_bounds)
# Remove erased tags (asterisks).
assert_equal(str(exp).replace('*', ''), str(result))
# replace_type_vars
def test_trivial_replace(self):
for t in (self.fx.a, self.fx.o, self.fx.void, self.fx.nonet,
self.tuple(self.fx.a),
self.callable([], self.fx.a, self.fx.a), self.fx.anyt,
self.fx.err):
self.assert_replace(t, t)
def test_replace_type_var(self):
self.assert_replace(self.fx.t, self.fx.anyt)
def test_replace_generic_instance(self):
self.assert_replace(self.fx.ga, self.fx.ga)
self.assert_replace(self.fx.gt, self.fx.gdyn)
def assert_replace(self, orig, result):
assert_equal(str(replace_type_vars(orig)), str(result))
# erase_type
def test_trivial_erase(self):
for t in (self.fx.a, self.fx.o, self.fx.void, self.fx.nonet,
self.fx.anyt, self.fx.err):
self.assert_erase(t, t)
def test_erase_with_type_variable(self):
self.assert_erase(self.fx.t, self.fx.anyt)
def test_erase_with_generic_type(self):
self.assert_erase(self.fx.ga, self.fx.gdyn)
self.assert_erase(self.fx.hab,
Instance(self.fx.hi, [self.fx.anyt, self.fx.anyt]))
def test_erase_with_tuple_type(self):
self.assert_erase(self.tuple(self.fx.a), self.fx.std_tuple)
def test_erase_with_function_type(self):
self.assert_erase(self.fx.callable(self.fx.a, self.fx.b),
self.fx.callable_type(self.fx.void))
def test_erase_with_type_object(self):
self.assert_erase(self.fx.callable_type(self.fx.a, self.fx.b),
self.fx.callable_type(self.fx.void))
def test_erase_with_type_type(self):
self.assert_erase(self.fx.type_a, self.fx.type_a)
self.assert_erase(self.fx.type_t, self.fx.type_any)
def assert_erase(self, orig, result):
assert_equal(str(erase_type(orig)), str(result))
# is_more_precise
def test_is_more_precise(self):
fx = self.fx
assert_true(is_more_precise(fx.b, fx.a))
assert_true(is_more_precise(fx.b, fx.b))
assert_true(is_more_precise(fx.b, fx.b))
assert_true(is_more_precise(fx.b, fx.anyt))
assert_true(is_more_precise(self.tuple(fx.b, fx.a),
self.tuple(fx.b, fx.a)))
assert_false(is_more_precise(fx.a, fx.b))
assert_false(is_more_precise(fx.anyt, fx.b))
assert_false(is_more_precise(self.tuple(fx.b, fx.b),
self.tuple(fx.b, fx.a)))
# is_proper_subtype
def test_is_proper_subtype(self):
fx = self.fx
assert_true(is_proper_subtype(fx.a, fx.a))
assert_true(is_proper_subtype(fx.b, fx.a))
assert_true(is_proper_subtype(fx.b, fx.o))
assert_true(is_proper_subtype(fx.b, fx.o))
assert_false(is_proper_subtype(fx.a, fx.b))
assert_false(is_proper_subtype(fx.o, fx.b))
assert_true(is_proper_subtype(fx.anyt, fx.anyt))
assert_false(is_proper_subtype(fx.a, fx.anyt))
assert_false(is_proper_subtype(fx.anyt, fx.a))
assert_true(is_proper_subtype(fx.ga, fx.ga))
assert_true(is_proper_subtype(fx.gdyn, fx.gdyn))
assert_false(is_proper_subtype(fx.ga, fx.gdyn))
assert_false(is_proper_subtype(fx.gdyn, fx.ga))
assert_true(is_proper_subtype(fx.t, fx.t))
assert_false(is_proper_subtype(fx.t, fx.s))
def test_is_proper_subtype_covariance(self):
fx_co = self.fx_co
assert_true(is_proper_subtype(fx_co.gsab, fx_co.gb))
assert_true(is_proper_subtype(fx_co.gsab, fx_co.ga))
assert_false(is_proper_subtype(fx_co.gsaa, fx_co.gb))
assert_true(is_proper_subtype(fx_co.gb, fx_co.ga))
assert_false(is_proper_subtype(fx_co.ga, fx_co.gb))
def test_is_proper_subtype_contravariance(self):
fx_contra = self.fx_contra
assert_true(is_proper_subtype(fx_contra.gsab, fx_contra.gb))
assert_false(is_proper_subtype(fx_contra.gsab, fx_contra.ga))
assert_true(is_proper_subtype(fx_contra.gsaa, fx_contra.gb))
assert_false(is_proper_subtype(fx_contra.gb, fx_contra.ga))
assert_true(is_proper_subtype(fx_contra.ga, fx_contra.gb))
def test_is_proper_subtype_invariance(self):
fx = self.fx
assert_true(is_proper_subtype(fx.gsab, fx.gb))
assert_false(is_proper_subtype(fx.gsab, fx.ga))
assert_false(is_proper_subtype(fx.gsaa, fx.gb))
assert_false(is_proper_subtype(fx.gb, fx.ga))
assert_false(is_proper_subtype(fx.ga, fx.gb))
# Helpers
def tuple(self, *a):
return TupleType(a, self.fx.std_tuple)
def callable(self, vars, *a) -> CallableType:
"""callable(args, a1, ..., an, r) constructs a callable with
argument types a1, ... an and return type r and type arguments
vars.
"""
tv = [] # type: List[TypeVarDef]
n = -1
for v in vars:
tv.append(TypeVarDef(v, n, None, self.fx.o))
n -= 1
return CallableType(list(a[:-1]),
[ARG_POS] * (len(a) - 1),
[None] * (len(a) - 1),
a[-1],
self.fx.function,
name=None,
variables=tv)
class TypeOpsSuite(Suite):
def set_up(self):
self.fx = TypeFixture(INVARIANT)
self.fx_co = TypeFixture(COVARIANT)
self.fx_contra = TypeFixture(CONTRAVARIANT)
# expand_type
def test_trivial_expand(self):
for t in (self.fx.a, self.fx.o, self.fx.t, self.fx.void, self.fx.nonet,
self.tuple(self.fx.a),
self.callable([], self.fx.a, self.fx.a), self.fx.anyt):
self.assert_expand(t, [], t)
self.assert_expand(t, [], t)
self.assert_expand(t, [], t)
def test_expand_naked_type_var(self):
self.assert_expand(self.fx.t, [(1, self.fx.a)], self.fx.a)
self.assert_expand(self.fx.t, [(2, self.fx.a)], self.fx.t)
def test_expand_basic_generic_types(self):
self.assert_expand(self.fx.gt, [(1, self.fx.a)], self.fx.ga)
# IDEA: Add test cases for
# tuple types
# callable types
# multiple arguments
def assert_expand(self, orig, map_items, result):
lower_bounds = {}
for id, t in map_items:
lower_bounds[id] = t
exp = expand_type(orig, lower_bounds)
# Remove erased tags (asterisks).
assert_equal(str(exp).replace('*', ''), str(result))
# replace_type_vars
def test_trivial_replace(self):
for t in (self.fx.a, self.fx.o, self.fx.void, self.fx.nonet,
self.tuple(self.fx.a), self.callable([], self.fx.a,
self.fx.a),
self.fx.anyt, self.fx.err):
self.assert_replace(t, t)
def test_replace_type_var(self):
self.assert_replace(self.fx.t, self.fx.anyt)
def test_replace_generic_instance(self):
self.assert_replace(self.fx.ga, self.fx.ga)
self.assert_replace(self.fx.gt, self.fx.gdyn)
def assert_replace(self, orig, result):
assert_equal(str(replace_type_vars(orig)), str(result))
# erase_type
def test_trivial_erase(self):
for t in (self.fx.a, self.fx.o, self.fx.void, self.fx.nonet,
self.fx.anyt, self.fx.err):
self.assert_erase(t, t)
def test_erase_with_type_variable(self):
self.assert_erase(self.fx.t, self.fx.anyt)
def test_erase_with_generic_type(self):
self.assert_erase(self.fx.ga, self.fx.gdyn)
self.assert_erase(self.fx.hab,
Instance(self.fx.hi, [self.fx.anyt, self.fx.anyt]))
def test_erase_with_tuple_type(self):
self.assert_erase(self.tuple(self.fx.a), self.fx.std_tuple)
def test_erase_with_function_type(self):
self.assert_erase(self.fx.callable(self.fx.a, self.fx.b),
self.fx.callable_type(self.fx.void))
def test_erase_with_type_object(self):
self.assert_erase(self.fx.callable_type(self.fx.a, self.fx.b),
self.fx.callable_type(self.fx.void))
def assert_erase(self, orig, result):
assert_equal(str(erase_type(orig)), str(result))
# is_more_precise
def test_is_more_precise(self):
fx = self.fx
assert_true(is_more_precise(fx.b, fx.a))
assert_true(is_more_precise(fx.b, fx.b))
assert_true(is_more_precise(fx.b, fx.b))
assert_true(is_more_precise(fx.b, fx.anyt))
assert_true(
is_more_precise(self.tuple(fx.b, fx.a), self.tuple(fx.b, fx.a)))
assert_false(is_more_precise(fx.a, fx.b))
assert_false(is_more_precise(fx.anyt, fx.b))
assert_false(
is_more_precise(self.tuple(fx.b, fx.b), self.tuple(fx.b, fx.a)))
# is_proper_subtype
def test_is_proper_subtype(self):
fx = self.fx
assert_true(is_proper_subtype(fx.a, fx.a))
assert_true(is_proper_subtype(fx.b, fx.a))
assert_true(is_proper_subtype(fx.b, fx.o))
assert_true(is_proper_subtype(fx.b, fx.o))
assert_false(is_proper_subtype(fx.a, fx.b))
assert_false(is_proper_subtype(fx.o, fx.b))
assert_true(is_proper_subtype(fx.anyt, fx.anyt))
assert_false(is_proper_subtype(fx.a, fx.anyt))
assert_false(is_proper_subtype(fx.anyt, fx.a))
assert_true(is_proper_subtype(fx.ga, fx.ga))
assert_true(is_proper_subtype(fx.gdyn, fx.gdyn))
assert_false(is_proper_subtype(fx.ga, fx.gdyn))
assert_false(is_proper_subtype(fx.gdyn, fx.ga))
assert_true(is_proper_subtype(fx.t, fx.t))
assert_false(is_proper_subtype(fx.t, fx.s))
def test_is_proper_subtype_covariance(self):
fx_co = self.fx_co
assert_true(is_proper_subtype(fx_co.gsab, fx_co.gb))
assert_true(is_proper_subtype(fx_co.gsab, fx_co.ga))
assert_false(is_proper_subtype(fx_co.gsaa, fx_co.gb))
assert_true(is_proper_subtype(fx_co.gb, fx_co.ga))
assert_false(is_proper_subtype(fx_co.ga, fx_co.gb))
def test_is_proper_subtype_contravariance(self):
fx_contra = self.fx_contra
assert_true(is_proper_subtype(fx_contra.gsab, fx_contra.gb))
assert_false(is_proper_subtype(fx_contra.gsab, fx_contra.ga))
assert_true(is_proper_subtype(fx_contra.gsaa, fx_contra.gb))
assert_false(is_proper_subtype(fx_contra.gb, fx_contra.ga))
assert_true(is_proper_subtype(fx_contra.ga, fx_contra.gb))
def test_is_proper_subtype_invariance(self):
fx = self.fx
assert_true(is_proper_subtype(fx.gsab, fx.gb))
assert_false(is_proper_subtype(fx.gsab, fx.ga))
assert_false(is_proper_subtype(fx.gsaa, fx.gb))
assert_false(is_proper_subtype(fx.gb, fx.ga))
assert_false(is_proper_subtype(fx.ga, fx.gb))
# Helpers
def tuple(self, *a):
return TupleType(a, self.fx.std_tuple)
def callable(self, vars, *a) -> CallableType:
"""callable(args, a1, ..., an, r) constructs a callable with
argument types a1, ... an and return type r and type arguments
vars.
"""
tv = [] # type: List[TypeVarDef]
n = -1
for v in vars:
tv.append(TypeVarDef(v, n, None, self.fx.o))
n -= 1
return CallableType(list(a[:-1]), [ARG_POS] * (len(a) - 1),
[None] * (len(a) - 1), a[-1], self.fx.function,
None, tv)
def set_up(self):
self.fx = TypeFixture(INVARIANT)
self.fx_co = TypeFixture(COVARIANT)
self.fx_contra = TypeFixture(CONTRAVARIANT)
def __init__(self):
super().__init__()
self.x = UnboundType('X') # Helpers
self.y = UnboundType('Y')
self.fx = TypeFixture()
self.function = self.fx.function
def set_up(self):
self.fx = TypeFixture()
def set_up(self) -> None:
self.fx = TypeFixture()
class SubtypingSuite(Suite):
def set_up(self) -> None:
self.fx = TypeFixture(INVARIANT)
self.fx_contra = TypeFixture(CONTRAVARIANT)
self.fx_co = TypeFixture(COVARIANT)
def test_trivial_cases(self) -> None:
for simple in self.fx_co.void, self.fx_co.a, self.fx_co.o, self.fx_co.b:
self.assert_subtype(simple, simple)
def test_instance_subtyping(self) -> None:
self.assert_strict_subtype(self.fx.a, self.fx.o)
self.assert_strict_subtype(self.fx.b, self.fx.o)
self.assert_strict_subtype(self.fx.b, self.fx.a)
self.assert_not_subtype(self.fx.a, self.fx.d)
self.assert_not_subtype(self.fx.b, self.fx.c)
def test_simple_generic_instance_subtyping_invariant(self) -> None:
self.assert_subtype(self.fx.ga, self.fx.ga)
self.assert_subtype(self.fx.hab, self.fx.hab)
self.assert_not_subtype(self.fx.ga, self.fx.g2a)
self.assert_not_subtype(self.fx.ga, self.fx.gb)
self.assert_not_subtype(self.fx.gb, self.fx.ga)
def test_simple_generic_instance_subtyping_covariant(self) -> None:
self.assert_subtype(self.fx_co.ga, self.fx_co.ga)
self.assert_subtype(self.fx_co.hab, self.fx_co.hab)
self.assert_not_subtype(self.fx_co.ga, self.fx_co.g2a)
self.assert_not_subtype(self.fx_co.ga, self.fx_co.gb)
self.assert_subtype(self.fx_co.gb, self.fx_co.ga)
def test_simple_generic_instance_subtyping_contravariant(self) -> None:
self.assert_subtype(self.fx_contra.ga, self.fx_contra.ga)
self.assert_subtype(self.fx_contra.hab, self.fx_contra.hab)
self.assert_not_subtype(self.fx_contra.ga, self.fx_contra.g2a)
self.assert_subtype(self.fx_contra.ga, self.fx_contra.gb)
self.assert_not_subtype(self.fx_contra.gb, self.fx_contra.ga)
def test_generic_subtyping_with_inheritance_invariant(self) -> None:
self.assert_subtype(self.fx.gsab, self.fx.gb)
self.assert_not_subtype(self.fx.gsab, self.fx.ga)
self.assert_not_subtype(self.fx.gsaa, self.fx.gb)
def test_generic_subtyping_with_inheritance_covariant(self) -> None:
self.assert_subtype(self.fx_co.gsab, self.fx_co.gb)
self.assert_subtype(self.fx_co.gsab, self.fx_co.ga)
self.assert_not_subtype(self.fx_co.gsaa, self.fx_co.gb)
def test_generic_subtyping_with_inheritance_contravariant(self) -> None:
self.assert_subtype(self.fx_contra.gsab, self.fx_contra.gb)
self.assert_not_subtype(self.fx_contra.gsab, self.fx_contra.ga)
self.assert_subtype(self.fx_contra.gsaa, self.fx_contra.gb)
def test_interface_subtyping(self) -> None:
self.assert_subtype(self.fx.e, self.fx.f)
self.assert_equivalent(self.fx.f, self.fx.f)
self.assert_not_subtype(self.fx.a, self.fx.f)
def test_generic_interface_subtyping(self) -> None:
# TODO make this work
self.skip()
fx2 = InterfaceTypeFixture()
self.assert_subtype(fx2.m1, fx2.gfa)
self.assert_not_subtype(fx2.m1, fx2.gfb)
self.assert_equivalent(fx2.gfa, fx2.gfa)
def test_basic_callable_subtyping(self) -> None:
self.assert_strict_subtype(self.fx.callable(self.fx.o, self.fx.d),
self.fx.callable(self.fx.a, self.fx.d))
self.assert_strict_subtype(self.fx.callable(self.fx.d, self.fx.b),
self.fx.callable(self.fx.d, self.fx.a))
self.assert_unrelated(self.fx.callable(self.fx.a, self.fx.a),
self.fx.callable(self.fx.a, self.fx.void))
self.assert_unrelated(
self.fx.callable(self.fx.a, self.fx.a, self.fx.a),
self.fx.callable(self.fx.a, self.fx.a))
def test_default_arg_callable_subtyping(self) -> None:
self.assert_strict_subtype(
self.fx.callable_default(1, self.fx.a, self.fx.d, self.fx.a),
self.fx.callable(self.fx.a, self.fx.d, self.fx.a))
self.assert_strict_subtype(
self.fx.callable_default(1, self.fx.a, self.fx.d, self.fx.a),
self.fx.callable(self.fx.a, self.fx.a))
self.assert_strict_subtype(
self.fx.callable_default(0, self.fx.a, self.fx.d, self.fx.a),
self.fx.callable_default(1, self.fx.a, self.fx.d, self.fx.a))
self.assert_unrelated(
self.fx.callable_default(1, self.fx.a, self.fx.d, self.fx.a),
self.fx.callable(self.fx.d, self.fx.d, self.fx.a))
self.assert_unrelated(
self.fx.callable_default(0, self.fx.a, self.fx.d, self.fx.a),
self.fx.callable_default(1, self.fx.a, self.fx.a, self.fx.a))
self.assert_unrelated(
self.fx.callable_default(1, self.fx.a, self.fx.a),
self.fx.callable(self.fx.a, self.fx.a, self.fx.a))
def test_var_arg_callable_subtyping_1(self) -> None:
self.assert_strict_subtype(
self.fx.callable_var_arg(0, self.fx.a, self.fx.a),
self.fx.callable_var_arg(0, self.fx.b, self.fx.a))
def test_var_arg_callable_subtyping_2(self) -> None:
self.assert_strict_subtype(
self.fx.callable_var_arg(0, self.fx.a, self.fx.a),
self.fx.callable(self.fx.b, self.fx.a))
def test_var_arg_callable_subtyping_3(self) -> None:
self.assert_strict_subtype(
self.fx.callable_var_arg(0, self.fx.a, self.fx.a),
self.fx.callable(self.fx.a))
def test_var_arg_callable_subtyping_4(self) -> None:
self.assert_strict_subtype(
self.fx.callable_var_arg(1, self.fx.a, self.fx.d, self.fx.a),
self.fx.callable(self.fx.b, self.fx.a))
def test_var_arg_callable_subtyping_5(self) -> None:
self.assert_strict_subtype(
self.fx.callable_var_arg(0, self.fx.a, self.fx.d, self.fx.a),
self.fx.callable(self.fx.b, self.fx.a))
def test_var_arg_callable_subtyping_6(self) -> None:
self.assert_strict_subtype(
self.fx.callable_var_arg(0, self.fx.a, self.fx.f, self.fx.d),
self.fx.callable_var_arg(0, self.fx.b, self.fx.e, self.fx.d))
def test_var_arg_callable_subtyping_7(self) -> None:
self.assert_not_subtype(
self.fx.callable_var_arg(0, self.fx.b, self.fx.d),
self.fx.callable(self.fx.a, self.fx.d))
def test_var_arg_callable_subtyping_8(self) -> None:
self.assert_not_subtype(
self.fx.callable_var_arg(0, self.fx.b, self.fx.d),
self.fx.callable_var_arg(0, self.fx.a, self.fx.a, self.fx.d))
self.assert_subtype(
self.fx.callable_var_arg(0, self.fx.a, self.fx.d),
self.fx.callable_var_arg(0, self.fx.b, self.fx.b, self.fx.d))
def test_var_arg_callable_subtyping_9(self) -> None:
self.assert_not_subtype(
self.fx.callable_var_arg(0, self.fx.b, self.fx.b, self.fx.d),
self.fx.callable_var_arg(0, self.fx.a, self.fx.d))
self.assert_subtype(
self.fx.callable_var_arg(0, self.fx.a, self.fx.a, self.fx.d),
self.fx.callable_var_arg(0, self.fx.b, self.fx.d))
def test_type_callable_subtyping(self) -> None:
self.assert_strict_subtype(self.fx.callable_type(self.fx.d, self.fx.a),
self.fx.type_type)
self.assert_strict_subtype(self.fx.callable_type(self.fx.d, self.fx.b),
self.fx.callable(self.fx.d, self.fx.a))
self.assert_strict_subtype(self.fx.callable_type(self.fx.a, self.fx.b),
self.fx.callable(self.fx.a, self.fx.b))
# IDEA: Maybe add these test cases (they are tested pretty well in type
# checker tests already):
# * more interface subtyping test cases
# * more generic interface subtyping test cases
# * type variables
# * tuple types
# * void type
# * None type
# * any type
# * generic function types
def assert_subtype(self, s: Type, t: Type) -> None:
assert_true(is_subtype(s, t), '{} not subtype of {}'.format(s, t))
def assert_not_subtype(self, s: Type, t: Type) -> None:
assert_true(not is_subtype(s, t), '{} subtype of {}'.format(s, t))
def assert_strict_subtype(self, s: Type, t: Type) -> None:
self.assert_subtype(s, t)
self.assert_not_subtype(t, s)
def assert_equivalent(self, s: Type, t: Type) -> None:
self.assert_subtype(s, t)
self.assert_subtype(t, s)
def assert_unrelated(self, s: Type, t: Type) -> None:
self.assert_not_subtype(s, t)
self.assert_not_subtype(t, s)
class TypeOpsSuite(Suite):
def set_up(self) -> None:
self.fx = TypeFixture(INVARIANT)
self.fx_co = TypeFixture(COVARIANT)
self.fx_contra = TypeFixture(CONTRAVARIANT)
# expand_type
def test_trivial_expand(self) -> None:
for t in (self.fx.a, self.fx.o, self.fx.t, self.fx.void, self.fx.nonet,
self.tuple(self.fx.a),
self.callable([], self.fx.a, self.fx.a), self.fx.anyt):
self.assert_expand(t, [], t)
self.assert_expand(t, [], t)
self.assert_expand(t, [], t)
def test_expand_naked_type_var(self) -> None:
self.assert_expand(self.fx.t, [(self.fx.t.id, self.fx.a)], self.fx.a)
self.assert_expand(self.fx.t, [(self.fx.s.id, self.fx.a)], self.fx.t)
def test_expand_basic_generic_types(self) -> None:
self.assert_expand(self.fx.gt, [(self.fx.t.id, self.fx.a)], self.fx.ga)
# IDEA: Add test cases for
# tuple types
# callable types
# multiple arguments
def assert_expand(
self,
orig: Type,
map_items: List[Tuple[TypeVarId, Type]],
result: Type,
) -> None:
lower_bounds = {}
for id, t in map_items:
lower_bounds[id] = t
exp = expand_type(orig, lower_bounds)
# Remove erased tags (asterisks).
assert_equal(str(exp).replace('*', ''), str(result))
# erase_type
def test_trivial_erase(self) -> None:
for t in (self.fx.a, self.fx.o, self.fx.void, self.fx.nonet,
self.fx.anyt, self.fx.err):
self.assert_erase(t, t)
def test_erase_with_type_variable(self) -> None:
self.assert_erase(self.fx.t, self.fx.anyt)
def test_erase_with_generic_type(self) -> None:
self.assert_erase(self.fx.ga, self.fx.gdyn)
self.assert_erase(self.fx.hab,
Instance(self.fx.hi, [self.fx.anyt, self.fx.anyt]))
def test_erase_with_tuple_type(self) -> None:
self.assert_erase(self.tuple(self.fx.a), self.fx.std_tuple)
def test_erase_with_function_type(self) -> None:
self.assert_erase(self.fx.callable(self.fx.a, self.fx.b),
self.fx.callable_type(self.fx.void))
def test_erase_with_type_object(self) -> None:
self.assert_erase(self.fx.callable_type(self.fx.a, self.fx.b),
self.fx.callable_type(self.fx.void))
def test_erase_with_type_type(self) -> None:
self.assert_erase(self.fx.type_a, self.fx.type_a)
self.assert_erase(self.fx.type_t, self.fx.type_any)
def assert_erase(self, orig: Type, result: Type) -> None:
assert_equal(str(erase_type(orig)), str(result))
# is_more_precise
def test_is_more_precise(self) -> None:
fx = self.fx
assert_true(is_more_precise(fx.b, fx.a))
assert_true(is_more_precise(fx.b, fx.b))
assert_true(is_more_precise(fx.b, fx.b))
assert_true(is_more_precise(fx.b, fx.anyt))
assert_true(
is_more_precise(self.tuple(fx.b, fx.a), self.tuple(fx.b, fx.a)))
assert_false(is_more_precise(fx.a, fx.b))
assert_false(is_more_precise(fx.anyt, fx.b))
assert_false(
is_more_precise(self.tuple(fx.b, fx.b), self.tuple(fx.b, fx.a)))
# is_proper_subtype
def test_is_proper_subtype(self) -> None:
fx = self.fx
assert_true(is_proper_subtype(fx.a, fx.a))
assert_true(is_proper_subtype(fx.b, fx.a))
assert_true(is_proper_subtype(fx.b, fx.o))
assert_true(is_proper_subtype(fx.b, fx.o))
assert_false(is_proper_subtype(fx.a, fx.b))
assert_false(is_proper_subtype(fx.o, fx.b))
assert_true(is_proper_subtype(fx.anyt, fx.anyt))
assert_false(is_proper_subtype(fx.a, fx.anyt))
assert_false(is_proper_subtype(fx.anyt, fx.a))
assert_true(is_proper_subtype(fx.ga, fx.ga))
assert_true(is_proper_subtype(fx.gdyn, fx.gdyn))
assert_false(is_proper_subtype(fx.ga, fx.gdyn))
assert_false(is_proper_subtype(fx.gdyn, fx.ga))
assert_true(is_proper_subtype(fx.t, fx.t))
assert_false(is_proper_subtype(fx.t, fx.s))
def test_is_proper_subtype_covariance(self) -> None:
fx_co = self.fx_co
assert_true(is_proper_subtype(fx_co.gsab, fx_co.gb))
assert_true(is_proper_subtype(fx_co.gsab, fx_co.ga))
assert_false(is_proper_subtype(fx_co.gsaa, fx_co.gb))
assert_true(is_proper_subtype(fx_co.gb, fx_co.ga))
assert_false(is_proper_subtype(fx_co.ga, fx_co.gb))
def test_is_proper_subtype_contravariance(self) -> None:
fx_contra = self.fx_contra
assert_true(is_proper_subtype(fx_contra.gsab, fx_contra.gb))
assert_false(is_proper_subtype(fx_contra.gsab, fx_contra.ga))
assert_true(is_proper_subtype(fx_contra.gsaa, fx_contra.gb))
assert_false(is_proper_subtype(fx_contra.gb, fx_contra.ga))
assert_true(is_proper_subtype(fx_contra.ga, fx_contra.gb))
def test_is_proper_subtype_invariance(self) -> None:
fx = self.fx
assert_true(is_proper_subtype(fx.gsab, fx.gb))
assert_false(is_proper_subtype(fx.gsab, fx.ga))
assert_false(is_proper_subtype(fx.gsaa, fx.gb))
assert_false(is_proper_subtype(fx.gb, fx.ga))
assert_false(is_proper_subtype(fx.ga, fx.gb))
# can_be_true / can_be_false
def test_empty_tuple_always_false(self) -> None:
tuple_type = self.tuple()
assert_true(tuple_type.can_be_false)
assert_false(tuple_type.can_be_true)
def test_nonempty_tuple_always_true(self) -> None:
tuple_type = self.tuple(AnyType(), AnyType())
assert_true(tuple_type.can_be_true)
assert_false(tuple_type.can_be_false)
def test_union_can_be_true_if_any_true(self) -> None:
union_type = UnionType([self.fx.a, self.tuple()])
assert_true(union_type.can_be_true)
def test_union_can_not_be_true_if_none_true(self) -> None:
union_type = UnionType([self.tuple(), self.tuple()])
assert_false(union_type.can_be_true)
def test_union_can_be_false_if_any_false(self) -> None:
union_type = UnionType([self.fx.a, self.tuple()])
assert_true(union_type.can_be_false)
def test_union_can_not_be_false_if_none_false(self) -> None:
union_type = UnionType([self.tuple(self.fx.a), self.tuple(self.fx.d)])
assert_false(union_type.can_be_false)
# true_only / false_only
def test_true_only_of_false_type_is_uninhabited(self) -> None:
to = true_only(NoneTyp())
assert_type(UninhabitedType, to)
def test_true_only_of_true_type_is_idempotent(self) -> None:
always_true = self.tuple(AnyType())
to = true_only(always_true)
assert_true(always_true is to)
def test_true_only_of_instance(self) -> None:
to = true_only(self.fx.a)
assert_equal(str(to), "A")
assert_true(to.can_be_true)
assert_false(to.can_be_false)
assert_type(Instance, to)
# The original class still can be false
assert_true(self.fx.a.can_be_false)
def test_true_only_of_union(self) -> None:
tup_type = self.tuple(AnyType())
# Union of something that is unknown, something that is always true, something
# that is always false
union_type = UnionType([self.fx.a, tup_type, self.tuple()])
to = true_only(union_type)
assert isinstance(to, UnionType)
assert_equal(len(to.items), 2)
assert_true(to.items[0].can_be_true)
assert_false(to.items[0].can_be_false)
assert_true(to.items[1] is tup_type)
def test_false_only_of_true_type_is_uninhabited(self) -> None:
fo = false_only(self.tuple(AnyType()))
assert_type(UninhabitedType, fo)
def test_false_only_of_false_type_is_idempotent(self) -> None:
always_false = NoneTyp()
fo = false_only(always_false)
assert_true(always_false is fo)
def test_false_only_of_instance(self) -> None:
fo = false_only(self.fx.a)
assert_equal(str(fo), "A")
assert_false(fo.can_be_true)
assert_true(fo.can_be_false)
assert_type(Instance, fo)
# The original class still can be true
assert_true(self.fx.a.can_be_true)
def test_false_only_of_union(self) -> None:
tup_type = self.tuple()
# Union of something that is unknown, something that is always true, something
# that is always false
union_type = UnionType([self.fx.a, self.tuple(AnyType()), tup_type])
assert_equal(len(union_type.items), 3)
fo = false_only(union_type)
assert isinstance(fo, UnionType)
assert_equal(len(fo.items), 2)
assert_false(fo.items[0].can_be_true)
assert_true(fo.items[0].can_be_false)
assert_true(fo.items[1] is tup_type)
# Helpers
def tuple(self, *a: Type) -> TupleType:
return TupleType(list(a), self.fx.std_tuple)
def callable(self, vars: List[str], *a: Type) -> CallableType:
"""callable(args, a1, ..., an, r) constructs a callable with
argument types a1, ... an and return type r and type arguments
vars.
"""
tv = [] # type: List[TypeVarDef]
n = -1
for v in vars:
tv.append(TypeVarDef(v, n, None, self.fx.o))
n -= 1
return CallableType(list(a[:-1]), [ARG_POS] * (len(a) - 1),
[None] * (len(a) - 1),
a[-1],
self.fx.function,
name=None,
variables=tv)
def set_up(self):
self.fx = TypeFixture()
class TypeOpsSuite(Suite):
def set_up(self):
self.fx = TypeFixture()
# ExpandTypes
def test_trivial_expand(self):
for t in (self.fx.a, self.fx.o, self.fx.t, self.fx.void, self.fx.nonet,
self.tuple(self.fx.a),
self.callable([], self.fx.a, self.fx.a), self.fx.anyt):
self.assert_expand(t, [], t)
self.assert_expand(t, [], t)
self.assert_expand(t, [], t)
def test_expand_naked_type_var(self):
self.assert_expand(self.fx.t, [(1, self.fx.a)], self.fx.a)
self.assert_expand(self.fx.t, [(2, self.fx.a)], self.fx.t)
def test_expand_basic_generic_types(self):
self.assert_expand(self.fx.gt, [(1, self.fx.a)], self.fx.ga)
# IDEA: Add test cases for
# tuple types
# callable types
# multiple arguments
def assert_expand(self, orig, map_items, result):
lower_bounds = {}
for id, t in map_items:
lower_bounds[id] = t
exp = expand_type(orig, lower_bounds)
# Remove erased tags (asterisks).
assert_equal(str(exp).replace('*', ''), str(result))
# ReplaceTypeVars
def test_trivial_replace(self):
for t in (self.fx.a, self.fx.o, self.fx.void, self.fx.nonet,
self.tuple(self.fx.a),
self.callable([], self.fx.a, self.fx.a), self.fx.anyt,
self.fx.err):
self.assert_replace(t, t)
def test_replace_type_var(self):
self.assert_replace(self.fx.t, self.fx.anyt)
def test_replace_generic_instance(self):
self.assert_replace(self.fx.ga, self.fx.ga)
self.assert_replace(self.fx.gt, self.fx.gdyn)
def assert_replace(self, orig, result):
assert_equal(str(replace_type_vars(orig)), str(result))
# EraseType
def test_trivial_erase(self):
for t in (self.fx.a, self.fx.o, self.fx.void, self.fx.nonet,
self.fx.anyt, self.fx.err):
self.assert_erase(t, t)
def test_erase_with_type_variable(self):
self.assert_erase(self.fx.t, self.fx.anyt)
def test_erase_with_generic_type(self):
self.assert_erase(self.fx.ga, self.fx.gdyn)
self.assert_erase(self.fx.hab,
Instance(self.fx.hi, [self.fx.anyt, self.fx.anyt]))
def test_erase_with_tuple_type(self):
self.assert_erase(self.tuple(self.fx.a), self.fx.std_tuple)
def test_erase_with_function_type(self):
self.assert_erase(self.fx.callable(self.fx.a, self.fx.b),
self.fx.callable_type(self.fx.void))
def test_erase_with_type_object(self):
self.assert_erase(self.fx.callable_type(self.fx.a, self.fx.b),
self.fx.callable_type(self.fx.void))
def assert_erase(self, orig, result):
assert_equal(str(erase_type(orig, self.fx.basic)), str(result))
# Helpers
def tuple(self, *a):
return TupleType(a)
Callable callable(self, vars, *a):
"""callable(args, a1, ..., an, r) constructs a callable with
argument types a1, ... an and return type r and type arguments
vars.
"""
tv = <TypeVarDef> []
n = -1
for v in vars:
tv.append(TypeVarDef(v, n))
n -= 1
return Callable(a[:-1], [ARG_POS] * (len(a) - 1),
<str> [None] * (len(a) - 1),
a[-1],
False,
None,
TypeVars(tv))
class TypeOpsSuite(Suite):
def set_up(self):
self.fx = TypeFixture(INVARIANT)
self.fx_co = TypeFixture(COVARIANT)
self.fx_contra = TypeFixture(CONTRAVARIANT)
# expand_type
def test_trivial_expand(self):
for t in (self.fx.a, self.fx.o, self.fx.t, self.fx.void, self.fx.nonet,
self.tuple(self.fx.a),
self.callable([], self.fx.a, self.fx.a), self.fx.anyt):
self.assert_expand(t, [], t)
self.assert_expand(t, [], t)
self.assert_expand(t, [], t)
def test_expand_naked_type_var(self):
self.assert_expand(self.fx.t, [(self.fx.t.id, self.fx.a)], self.fx.a)
self.assert_expand(self.fx.t, [(self.fx.s.id, self.fx.a)], self.fx.t)
def test_expand_basic_generic_types(self):
self.assert_expand(self.fx.gt, [(self.fx.t.id, self.fx.a)], self.fx.ga)
# IDEA: Add test cases for
# tuple types
# callable types
# multiple arguments
def assert_expand(self, orig, map_items, result):
lower_bounds = {}
for id, t in map_items:
lower_bounds[id] = t
exp = expand_type(orig, lower_bounds)
# Remove erased tags (asterisks).
assert_equal(str(exp).replace('*', ''), str(result))
# erase_type
def test_trivial_erase(self):
for t in (self.fx.a, self.fx.o, self.fx.void, self.fx.nonet,
self.fx.anyt, self.fx.err):
self.assert_erase(t, t)
def test_erase_with_type_variable(self):
self.assert_erase(self.fx.t, self.fx.anyt)
def test_erase_with_generic_type(self):
self.assert_erase(self.fx.ga, self.fx.gdyn)
self.assert_erase(self.fx.hab,
Instance(self.fx.hi, [self.fx.anyt, self.fx.anyt]))
def test_erase_with_tuple_type(self):
self.assert_erase(self.tuple(self.fx.a), self.fx.std_tuple)
def test_erase_with_function_type(self):
self.assert_erase(self.fx.callable(self.fx.a, self.fx.b),
self.fx.callable_type(self.fx.void))
def test_erase_with_type_object(self):
self.assert_erase(self.fx.callable_type(self.fx.a, self.fx.b),
self.fx.callable_type(self.fx.void))
def test_erase_with_type_type(self):
self.assert_erase(self.fx.type_a, self.fx.type_a)
self.assert_erase(self.fx.type_t, self.fx.type_any)
def assert_erase(self, orig, result):
assert_equal(str(erase_type(orig)), str(result))
# is_more_precise
def test_is_more_precise(self):
fx = self.fx
assert_true(is_more_precise(fx.b, fx.a))
assert_true(is_more_precise(fx.b, fx.b))
assert_true(is_more_precise(fx.b, fx.b))
assert_true(is_more_precise(fx.b, fx.anyt))
assert_true(is_more_precise(self.tuple(fx.b, fx.a),
self.tuple(fx.b, fx.a)))
assert_false(is_more_precise(fx.a, fx.b))
assert_false(is_more_precise(fx.anyt, fx.b))
assert_false(is_more_precise(self.tuple(fx.b, fx.b),
self.tuple(fx.b, fx.a)))
# is_proper_subtype
def test_is_proper_subtype(self):
fx = self.fx
assert_true(is_proper_subtype(fx.a, fx.a))
assert_true(is_proper_subtype(fx.b, fx.a))
assert_true(is_proper_subtype(fx.b, fx.o))
assert_true(is_proper_subtype(fx.b, fx.o))
assert_false(is_proper_subtype(fx.a, fx.b))
assert_false(is_proper_subtype(fx.o, fx.b))
assert_true(is_proper_subtype(fx.anyt, fx.anyt))
assert_false(is_proper_subtype(fx.a, fx.anyt))
assert_false(is_proper_subtype(fx.anyt, fx.a))
assert_true(is_proper_subtype(fx.ga, fx.ga))
assert_true(is_proper_subtype(fx.gdyn, fx.gdyn))
assert_false(is_proper_subtype(fx.ga, fx.gdyn))
assert_false(is_proper_subtype(fx.gdyn, fx.ga))
assert_true(is_proper_subtype(fx.t, fx.t))
assert_false(is_proper_subtype(fx.t, fx.s))
def test_is_proper_subtype_covariance(self):
fx_co = self.fx_co
assert_true(is_proper_subtype(fx_co.gsab, fx_co.gb))
assert_true(is_proper_subtype(fx_co.gsab, fx_co.ga))
assert_false(is_proper_subtype(fx_co.gsaa, fx_co.gb))
assert_true(is_proper_subtype(fx_co.gb, fx_co.ga))
assert_false(is_proper_subtype(fx_co.ga, fx_co.gb))
def test_is_proper_subtype_contravariance(self):
fx_contra = self.fx_contra
assert_true(is_proper_subtype(fx_contra.gsab, fx_contra.gb))
assert_false(is_proper_subtype(fx_contra.gsab, fx_contra.ga))
assert_true(is_proper_subtype(fx_contra.gsaa, fx_contra.gb))
assert_false(is_proper_subtype(fx_contra.gb, fx_contra.ga))
assert_true(is_proper_subtype(fx_contra.ga, fx_contra.gb))
def test_is_proper_subtype_invariance(self):
fx = self.fx
assert_true(is_proper_subtype(fx.gsab, fx.gb))
assert_false(is_proper_subtype(fx.gsab, fx.ga))
assert_false(is_proper_subtype(fx.gsaa, fx.gb))
assert_false(is_proper_subtype(fx.gb, fx.ga))
assert_false(is_proper_subtype(fx.ga, fx.gb))
# can_be_true / can_be_false
def test_empty_tuple_always_false(self):
tuple_type = self.tuple()
assert_true(tuple_type.can_be_false)
assert_false(tuple_type.can_be_true)
def test_nonempty_tuple_always_true(self):
tuple_type = self.tuple(AnyType(), AnyType())
assert_true(tuple_type.can_be_true)
assert_false(tuple_type.can_be_false)
def test_union_can_be_true_if_any_true(self):
union_type = UnionType([self.fx.a, self.tuple()])
assert_true(union_type.can_be_true)
def test_union_can_not_be_true_if_none_true(self):
union_type = UnionType([self.tuple(), self.tuple()])
assert_false(union_type.can_be_true)
def test_union_can_be_false_if_any_false(self):
union_type = UnionType([self.fx.a, self.tuple()])
assert_true(union_type.can_be_false)
def test_union_can_not_be_false_if_none_false(self):
union_type = UnionType([self.tuple(self.fx.a), self.tuple(self.fx.d)])
assert_false(union_type.can_be_false)
# true_only / false_only
def test_true_only_of_false_type_is_uninhabited(self):
to = true_only(NoneTyp())
assert_type(UninhabitedType, to)
def test_true_only_of_true_type_is_idempotent(self):
always_true = self.tuple(AnyType())
to = true_only(always_true)
assert_true(always_true is to)
def test_true_only_of_instance(self):
to = true_only(self.fx.a)
assert_equal(str(to), "A")
assert_true(to.can_be_true)
assert_false(to.can_be_false)
assert_type(Instance, to)
# The original class still can be false
assert_true(self.fx.a.can_be_false)
def test_true_only_of_union(self):
tup_type = self.tuple(AnyType())
# Union of something that is unknown, something that is always true, something
# that is always false
union_type = UnionType([self.fx.a, tup_type, self.tuple()])
to = true_only(union_type)
assert_equal(len(to.items), 2)
assert_true(to.items[0].can_be_true)
assert_false(to.items[0].can_be_false)
assert_true(to.items[1] is tup_type)
def test_false_only_of_true_type_is_uninhabited(self):
fo = false_only(self.tuple(AnyType()))
assert_type(UninhabitedType, fo)
def test_false_only_of_false_type_is_idempotent(self):
always_false = NoneTyp()
fo = false_only(always_false)
assert_true(always_false is fo)
def test_false_only_of_instance(self):
fo = false_only(self.fx.a)
assert_equal(str(fo), "A")
assert_false(fo.can_be_true)
assert_true(fo.can_be_false)
assert_type(Instance, fo)
# The original class still can be true
assert_true(self.fx.a.can_be_true)
def test_false_only_of_union(self):
tup_type = self.tuple()
# Union of something that is unknown, something that is always true, something
# that is always false
union_type = UnionType([self.fx.a, self.tuple(AnyType()), tup_type])
assert_equal(len(union_type.items), 3)
fo = false_only(union_type)
assert_equal(len(fo.items), 2)
assert_false(fo.items[0].can_be_true)
assert_true(fo.items[0].can_be_false)
assert_true(fo.items[1] is tup_type)
# Helpers
def tuple(self, *a):
return TupleType(a, self.fx.std_tuple)
def callable(self, vars, *a) -> CallableType:
"""callable(args, a1, ..., an, r) constructs a callable with
argument types a1, ... an and return type r and type arguments
vars.
"""
tv = [] # type: List[TypeVarDef]
n = -1
for v in vars:
tv.append(TypeVarDef(v, n, None, self.fx.o))
n -= 1
return CallableType(list(a[:-1]),
[ARG_POS] * (len(a) - 1),
[None] * (len(a) - 1),
a[-1],
self.fx.function,
name=None,
variables=tv)
def tuple(self, *args: Type) -> TupleType:
return TupleType(list(args), TypeFixture().std_tuple)