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test_stl.py
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Thu, Feb 20, 04:49

test_stl.py
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import pytest
from pybind11_tests import stl as m
from pybind11_tests import UserType
from pybind11_tests import ConstructorStats
def test_vector(doc):
"""std::vector <-> list"""
lst = m.cast_vector()
assert lst == [1]
lst.append(2)
assert m.load_vector(lst)
assert m.load_vector(tuple(lst))
assert m.cast_bool_vector() == [True, False]
assert m.load_bool_vector([True, False])
assert doc(m.cast_vector) == "cast_vector() -> List[int]"
assert doc(m.load_vector) == "load_vector(arg0: List[int]) -> bool"
# Test regression caused by 936: pointers to stl containers weren't castable
assert m.cast_ptr_vector() == ["lvalue", "lvalue"]
def test_deque(doc):
"""std::deque <-> list"""
lst = m.cast_deque()
assert lst == [1]
lst.append(2)
assert m.load_deque(lst)
assert m.load_deque(tuple(lst))
def test_array(doc):
"""std::array <-> list"""
lst = m.cast_array()
assert lst == [1, 2]
assert m.load_array(lst)
assert doc(m.cast_array) == "cast_array() -> List[int[2]]"
assert doc(m.load_array) == "load_array(arg0: List[int[2]]) -> bool"
def test_valarray(doc):
"""std::valarray <-> list"""
lst = m.cast_valarray()
assert lst == [1, 4, 9]
assert m.load_valarray(lst)
assert doc(m.cast_valarray) == "cast_valarray() -> List[int]"
assert doc(m.load_valarray) == "load_valarray(arg0: List[int]) -> bool"
def test_map(doc):
"""std::map <-> dict"""
d = m.cast_map()
assert d == {"key": "value"}
d["key2"] = "value2"
assert m.load_map(d)
assert doc(m.cast_map) == "cast_map() -> Dict[str, str]"
assert doc(m.load_map) == "load_map(arg0: Dict[str, str]) -> bool"
def test_set(doc):
"""std::set <-> set"""
s = m.cast_set()
assert s == {"key1", "key2"}
s.add("key3")
assert m.load_set(s)
assert doc(m.cast_set) == "cast_set() -> Set[str]"
assert doc(m.load_set) == "load_set(arg0: Set[str]) -> bool"
def test_recursive_casting():
"""Tests that stl casters preserve lvalue/rvalue context for container values"""
assert m.cast_rv_vector() == ["rvalue", "rvalue"]
assert m.cast_lv_vector() == ["lvalue", "lvalue"]
assert m.cast_rv_array() == ["rvalue", "rvalue", "rvalue"]
assert m.cast_lv_array() == ["lvalue", "lvalue"]
assert m.cast_rv_map() == {"a": "rvalue"}
assert m.cast_lv_map() == {"a": "lvalue", "b": "lvalue"}
assert m.cast_rv_nested() == [[[{"b": "rvalue", "c": "rvalue"}], [{"a": "rvalue"}]]]
assert m.cast_lv_nested() == {
"a": [[["lvalue", "lvalue"]], [["lvalue", "lvalue"]]],
"b": [[["lvalue", "lvalue"], ["lvalue", "lvalue"]]]
}
# Issue #853 test case:
z = m.cast_unique_ptr_vector()
assert z[0].value == 7 and z[1].value == 42
def test_move_out_container():
"""Properties use the `reference_internal` policy by default. If the underlying function
returns an rvalue, the policy is automatically changed to `move` to avoid referencing
a temporary. In case the return value is a container of user-defined types, the policy
also needs to be applied to the elements, not just the container."""
c = m.MoveOutContainer()
moved_out_list = c.move_list
assert [x.value for x in moved_out_list] == [0, 1, 2]
@pytest.mark.skipif(not hasattr(m, "has_optional"), reason='no <optional>')
def test_optional():
assert m.double_or_zero(None) == 0
assert m.double_or_zero(42) == 84
pytest.raises(TypeError, m.double_or_zero, 'foo')
assert m.half_or_none(0) is None
assert m.half_or_none(42) == 21
pytest.raises(TypeError, m.half_or_none, 'foo')
assert m.test_nullopt() == 42
assert m.test_nullopt(None) == 42
assert m.test_nullopt(42) == 42
assert m.test_nullopt(43) == 43
assert m.test_no_assign() == 42
assert m.test_no_assign(None) == 42
assert m.test_no_assign(m.NoAssign(43)) == 43
pytest.raises(TypeError, m.test_no_assign, 43)
assert m.nodefer_none_optional(None)
@pytest.mark.skipif(not hasattr(m, "has_exp_optional"), reason='no <experimental/optional>')
def test_exp_optional():
assert m.double_or_zero_exp(None) == 0
assert m.double_or_zero_exp(42) == 84
pytest.raises(TypeError, m.double_or_zero_exp, 'foo')
assert m.half_or_none_exp(0) is None
assert m.half_or_none_exp(42) == 21
pytest.raises(TypeError, m.half_or_none_exp, 'foo')
assert m.test_nullopt_exp() == 42
assert m.test_nullopt_exp(None) == 42
assert m.test_nullopt_exp(42) == 42
assert m.test_nullopt_exp(43) == 43
assert m.test_no_assign_exp() == 42
assert m.test_no_assign_exp(None) == 42
assert m.test_no_assign_exp(m.NoAssign(43)) == 43
pytest.raises(TypeError, m.test_no_assign_exp, 43)
@pytest.mark.skipif(not hasattr(m, "load_variant"), reason='no <variant>')
def test_variant(doc):
assert m.load_variant(1) == "int"
assert m.load_variant("1") == "std::string"
assert m.load_variant(1.0) == "double"
assert m.load_variant(None) == "std::nullptr_t"
assert m.load_variant_2pass(1) == "int"
assert m.load_variant_2pass(1.0) == "double"
assert m.cast_variant() == (5, "Hello")
assert doc(m.load_variant) == "load_variant(arg0: Union[int, str, float, None]) -> str"
def test_vec_of_reference_wrapper():
"""#171: Can't return reference wrappers (or STL structures containing them)"""
assert str(m.return_vec_of_reference_wrapper(UserType(4))) == \
"[UserType(1), UserType(2), UserType(3), UserType(4)]"
def test_stl_pass_by_pointer(msg):
"""Passing nullptr or None to an STL container pointer is not expected to work"""
with pytest.raises(TypeError) as excinfo:
m.stl_pass_by_pointer() # default value is `nullptr`
assert msg(excinfo.value) == """
stl_pass_by_pointer(): incompatible function arguments. The following argument types are supported:
1. (v: List[int] = None) -> List[int]
Invoked with:
""" # noqa: E501 line too long
with pytest.raises(TypeError) as excinfo:
m.stl_pass_by_pointer(None)
assert msg(excinfo.value) == """
stl_pass_by_pointer(): incompatible function arguments. The following argument types are supported:
1. (v: List[int] = None) -> List[int]
Invoked with: None
""" # noqa: E501 line too long
assert m.stl_pass_by_pointer([1, 2, 3]) == [1, 2, 3]
def test_missing_header_message():
"""Trying convert `list` to a `std::vector`, or vice versa, without including
<pybind11/stl.h> should result in a helpful suggestion in the error message"""
import pybind11_cross_module_tests as cm
expected_message = ("Did you forget to `#include <pybind11/stl.h>`? Or <pybind11/complex.h>,\n"
"<pybind11/functional.h>, <pybind11/chrono.h>, etc. Some automatic\n"
"conversions are optional and require extra headers to be included\n"
"when compiling your pybind11 module.")
with pytest.raises(TypeError) as excinfo:
cm.missing_header_arg([1.0, 2.0, 3.0])
assert expected_message in str(excinfo.value)
with pytest.raises(TypeError) as excinfo:
cm.missing_header_return()
assert expected_message in str(excinfo.value)
def test_function_with_string_and_vector_string_arg():
"""Check if a string is NOT implicitly converted to a list, which was the
behavior before fix of issue #1258"""
assert m.func_with_string_or_vector_string_arg_overload(('A', 'B', )) == 2
assert m.func_with_string_or_vector_string_arg_overload(['A', 'B']) == 2
assert m.func_with_string_or_vector_string_arg_overload('A') == 3
def test_stl_ownership():
cstats = ConstructorStats.get(m.Placeholder)
assert cstats.alive() == 0
r = m.test_stl_ownership()
assert len(r) == 1
del r
assert cstats.alive() == 0
def test_array_cast_sequence():
assert m.array_cast_sequence((1, 2, 3)) == [1, 2, 3]
def test_issue_1561():
""" check fix for issue #1561 """
bar = m.Issue1561Outer()
bar.list = [m.Issue1561Inner('bar')]
bar.list
assert bar.list[0].data == 'bar'

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