pyo3/tests/test_class_attributes.rs

163 lines
3.8 KiB
Rust

#![cfg(feature = "macros")]
use pyo3::prelude::*;
mod common;
#[pyclass]
struct Foo {
#[pyo3(get)]
x: i32,
}
#[pyclass]
struct Bar {
#[pyo3(get)]
x: i32,
}
#[pymethods]
impl Foo {
#[classattr]
const MY_CONST: &'static str = "foobar";
#[classattr]
#[pyo3(name = "RENAMED_CONST")]
const MY_CONST_2: &'static str = "foobar_2";
#[classattr]
fn a() -> i32 {
5
}
#[classattr]
#[pyo3(name = "B")]
fn b() -> String {
"bar".to_string()
}
#[classattr]
fn bar() -> Bar {
Bar { x: 2 }
}
#[classattr]
fn a_foo() -> Foo {
Foo { x: 1 }
}
#[classattr]
fn a_foo_with_py(py: Python<'_>) -> Py<Foo> {
Py::new(py, Foo { x: 1 }).unwrap()
}
}
#[test]
fn class_attributes() {
Python::with_gil(|py| {
let foo_obj = py.get_type::<Foo>();
py_assert!(py, foo_obj, "foo_obj.MY_CONST == 'foobar'");
py_assert!(py, foo_obj, "foo_obj.RENAMED_CONST == 'foobar_2'");
py_assert!(py, foo_obj, "foo_obj.a == 5");
py_assert!(py, foo_obj, "foo_obj.B == 'bar'");
py_assert!(py, foo_obj, "foo_obj.a_foo.x == 1");
py_assert!(py, foo_obj, "foo_obj.a_foo_with_py.x == 1");
});
}
// Ignored because heap types are not immutable:
// https://github.com/python/cpython/blob/master/Objects/typeobject.c#L3399-L3409
#[test]
#[ignore]
fn class_attributes_are_immutable() {
Python::with_gil(|py| {
let foo_obj = py.get_type::<Foo>();
py_expect_exception!(py, foo_obj, "foo_obj.a = 6", PyTypeError);
});
}
#[pymethods]
impl Bar {
#[classattr]
fn a_foo() -> Foo {
Foo { x: 3 }
}
}
#[test]
fn recursive_class_attributes() {
Python::with_gil(|py| {
let foo_obj = py.get_type::<Foo>();
let bar_obj = py.get_type::<Bar>();
py_assert!(py, foo_obj, "foo_obj.a_foo.x == 1");
py_assert!(py, foo_obj, "foo_obj.bar.x == 2");
py_assert!(py, bar_obj, "bar_obj.a_foo.x == 3");
});
}
#[test]
fn test_fallible_class_attribute() {
use pyo3::{exceptions::PyValueError, types::PyString};
struct CaptureStdErr<'py> {
oldstderr: &'py PyAny,
string_io: &'py PyAny,
}
impl<'py> CaptureStdErr<'py> {
fn new(py: Python<'py>) -> PyResult<Self> {
let sys = py.import("sys")?;
let oldstderr = sys.getattr("stderr")?;
let string_io = py.import("io")?.getattr("StringIO")?.call0()?;
sys.setattr("stderr", string_io)?;
Ok(Self {
oldstderr,
string_io,
})
}
fn reset(self) -> PyResult<String> {
let py = self.string_io.py();
let payload = self
.string_io
.getattr("getvalue")?
.call0()?
.downcast::<PyString>()?
.to_str()?
.to_owned();
let sys = py.import("sys")?;
sys.setattr("stderr", self.oldstderr)?;
Ok(payload)
}
}
#[pyclass]
struct BrokenClass;
#[pymethods]
impl BrokenClass {
#[classattr]
fn fails_to_init() -> PyResult<i32> {
Err(PyValueError::new_err("failed to create class attribute"))
}
}
Python::with_gil(|py| {
let stderr = CaptureStdErr::new(py).unwrap();
assert!(std::panic::catch_unwind(|| py.get_type::<BrokenClass>()).is_err());
assert_eq!(
stderr.reset().unwrap().trim(),
"\
ValueError: failed to create class attribute
The above exception was the direct cause of the following exception:
RuntimeError: An error occurred while initializing `BrokenClass.fails_to_init`
The above exception was the direct cause of the following exception:
RuntimeError: An error occurred while initializing class BrokenClass"
)
});
}