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"""Tests for class inheritance."""
from __future__ import annotations
from typing import TYPE_CHECKING, Callable
import pytest
from griffe import ModulesCollection, temporary_inspected_module, temporary_visited_module
if TYPE_CHECKING:
from griffe import Class
def _mro_paths(cls: Class) -> list[str]:
return [base.path for base in cls.mro()]
@pytest.mark.parametrize("agent1", [temporary_visited_module, temporary_inspected_module])
@pytest.mark.parametrize("agent2", [temporary_visited_module, temporary_inspected_module])
def test_loading_inherited_members(agent1: Callable, agent2: Callable) -> None:
"""Test basic class inheritance.
Parameters:
agent1: A parametrized agent to load a module.
agent2: A parametrized agent to load a module.
"""
code1 = """
class A:
attr_from_a = 0
def method_from_a(self): ...
class B(A):
attr_from_a = 1
attr_from_b = 1
def method_from_b(self): ...
"""
code2 = """
from module1 import B
class C(B):
attr_from_c = 2
def method_from_c(self): ...
class D(C):
attr_from_a = 3
attr_from_d = 3
def method_from_d(self): ...
"""
inspection_options = {}
collection = ModulesCollection()
with agent1(code1, module_name="module1", modules_collection=collection) as module1:
if agent2 is temporary_inspected_module:
inspection_options["import_paths"] = [module1.filepath.parent]
with agent2(code2, module_name="module2", modules_collection=collection, **inspection_options) as module2:
classa = module1["A"]
classb = module1["B"]
classc = module2["C"]
classd = module2["D"]
assert classa in classb.resolved_bases
assert classb in classc.resolved_bases
assert classc in classd.resolved_bases
classd_mro = classd.mro()
assert classa in classd_mro
assert classb in classd_mro
assert classc in classd_mro
inherited_members = classd.inherited_members
assert "attr_from_a" not in inherited_members # Overwritten.
assert "attr_from_b" in inherited_members
assert "attr_from_c" in inherited_members
assert "attr_from_d" not in inherited_members # Own-declared.
assert "method_from_a" in inherited_members
assert "method_from_b" in inherited_members
assert "method_from_c" in inherited_members
assert "method_from_d" not in inherited_members # Own-declared.
assert "attr_from_b" in classd.all_members
@pytest.mark.parametrize("agent", [temporary_visited_module, temporary_inspected_module])
def test_nested_class_inheritance(agent: Callable) -> None:
"""Test nested class inheritance.
Parameters:
agent: A parametrized agent to load a module.
"""
code = """
class A:
class B:
attr_from_b = 0
class C(A.B):
attr_from_c = 1
"""
with agent(code) as module:
assert "attr_from_b" in module["C"].inherited_members
code = """
class OuterA:
class Inner: ...
class OuterB(OuterA):
class Inner(OuterA.Inner): ...
class OuterC(OuterA):
class Inner(OuterA.Inner): ...
class OuterD(OuterC):
class Inner(OuterC.Inner, OuterB.Inner): ...
"""
with temporary_visited_module(code) as module:
assert _mro_paths(module["OuterD.Inner"]) == [
"module.OuterC.Inner",
"module.OuterB.Inner",
"module.OuterA.Inner",
]
@pytest.mark.parametrize(
("classes", "cls", "expected_mro"),
[
(["A", "B(A)"], "B", ["A"]),
(["A", "B(A)", "C(A)", "D(B, C)"], "D", ["B", "C", "A"]),
(["A", "B(A)", "C(A)", "D(C, B)"], "D", ["C", "B", "A"]),
(["A(Z)"], "A", []),
(["A(str)"], "A", []),
(["A", "B(A)", "C(B)", "D(C)"], "D", ["C", "B", "A"]),
(["A", "B(A)", "C(B)", "D(C)", "E(A)", "F(B)", "G(F, E)", "H(G, D)"], "H", ["G", "F", "D", "C", "B", "E", "A"]),
(["A", "B(A[T])", "C(B[T])"], "C", ["B", "A"]),
],
)
def test_computing_mro(classes: list[str], cls: str, expected_mro: list[str]) -> None:
"""Test computing MRO.
Parameters:
classes: A list of classes inheriting from each other.
cls: The class to compute the MRO of.
expected_mro: The expected computed MRO.
"""
code = "class " + ": ...\nclass ".join(classes) + ": ..."
with temporary_visited_module(code) as module:
assert _mro_paths(module[cls]) == [f"module.{base}" for base in expected_mro]
@pytest.mark.parametrize(
("classes", "cls"),
[
(["A", "B(A, A)"], "B"),
(["A(D)", "B", "C(A, B)", "D(C)"], "D"),
],
)
def test_uncomputable_mro(classes: list[str], cls: str) -> None:
"""Test uncomputable MRO.
Parameters:
classes: A list of classes inheriting from each other.
cls: The class to compute the MRO of.
"""
code = "class " + ": ...\nclass ".join(classes) + ": ..."
with temporary_visited_module(code) as module, pytest.raises(ValueError, match="Cannot compute C3 linearization"):
_mro_paths(module[cls])
def test_dynamic_base_classes() -> None:
"""Test dynamic base classes."""
code = """
from collections import namedtuple
class A(namedtuple("B", "attrb")):
attra = 0
"""
with temporary_visited_module(code) as module:
assert _mro_paths(module["A"]) == [] # Not supported.
with temporary_inspected_module(code) as module:
assert _mro_paths(module["A"]) == [] # Not supported either.
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