[flake8-bugbear] Allow B901 in pytest hook wrappers

crates/ruff_linter/resources/test/fixtures/flake8_bugbear/B901.py

@@ -86,3 +86,43 @@ async def broken6():
 async def broken7():
     yield 1
     return [1, 2, 3]
+
+
+import pytest
+
+
+@pytest.hookimpl(wrapper=True)
+def pytest_runtest_makereport():
+    result = yield
+    return result
+
+
+@pytest.hookimpl(wrapper=True)
+def pytest_fixture_setup():
+    result = yield
+    result.some_attr = "modified"
+    return result
+
+
+@pytest.hookimpl(hookwrapper=True)
+def pytest_runtest_call():
+    result = yield
+    return result
+
+
+@pytest.hookimpl()
+def pytest_configure():
+    yield
+    return "should error"
+
+
+@pytest.hookimpl(wrapper=False)
+def pytest_unconfigure():
+    yield
+    return "should error"
+
+
+@pytest.fixture()
+def my_fixture():
+    yield
+    return "should error"

crates/ruff_linter/src/rules/flake8_bugbear/rules/return_in_generator.rs

@@ -5,6 +5,7 @@ use ruff_text_size::TextRange;
 
 use crate::Violation;
 use crate::checkers::ast::Checker;
+use crate::rules::flake8_pytest_style::helpers::is_pytest_hookimpl_wrapper;
 
 /// ## What it does
 /// Checks for `return {value}` statements in functions that also contain `yield`
@@ -100,6 +101,14 @@ pub(crate) fn return_in_generator(checker: &Checker, function_def: &StmtFunction
         return;
     }
 
+    if function_def
+        .decorator_list
+        .iter()
+        .any(|decorator| is_pytest_hookimpl_wrapper(decorator, checker.semantic()))
+    {
+        return;
+    }
+
     let mut visitor = ReturnInGeneratorVisitor::default();
     visitor.visit_body(&function_def.body);
 

crates/ruff_linter/src/rules/flake8_bugbear/snapshots/ruff_linter__rules__flake8_bugbear__tests__B901_B901.py.snap

@@ -64,3 +64,30 @@ B901 Using `yield` and `return {value}` in a generator function can lead to conf
 88 |     return [1, 2, 3]
    |     ^^^^^^^^^^^^^^^^
    |
+
+B901 Using `yield` and `return {value}` in a generator function can lead to confusing behavior
+   --> B901.py:116:5
+    |
+114 | def pytest_configure():
+115 |     yield
+116 |     return "should error"
+    |     ^^^^^^^^^^^^^^^^^^^^^
+    |
+
+B901 Using `yield` and `return {value}` in a generator function can lead to confusing behavior
+   --> B901.py:122:5
+    |
+120 | def pytest_unconfigure():
+121 |     yield
+122 |     return "should error"
+    |     ^^^^^^^^^^^^^^^^^^^^^
+    |
+
+B901 Using `yield` and `return {value}` in a generator function can lead to confusing behavior
+   --> B901.py:128:5
+    |
+126 | def my_fixture():
+127 |     yield
+128 |     return "should error"
+    |     ^^^^^^^^^^^^^^^^^^^^^
+    |

crates/ruff_linter/src/rules/flake8_pytest_style/helpers.rs

@@ -1,6 +1,6 @@
 use std::fmt;
 
-use ruff_python_ast::helpers::map_callable;
+use ruff_python_ast::helpers::{is_const_true, map_callable};
 use ruff_python_ast::{self as ast, Decorator, Expr, ExprCall, Keyword, Stmt, StmtFunctionDef};
 use ruff_python_semantic::analyze::visibility;
 use ruff_python_semantic::{ScopeKind, SemanticModel};
@@ -50,6 +50,33 @@ pub(super) fn is_pytest_parametrize(call: &ExprCall, semantic: &SemanticModel) -
         })
 }
 
+/// Returns `true` if the decorator is `@pytest.hookimpl(wrapper=True)` or
+/// `@pytest.hookimpl(hookwrapper=True)`.
+///
+/// These hook wrappers intentionally use `return` in generator functions as part of the
+/// pytest hook wrapper protocol.
+///
+/// See: <https://docs.pytest.org/en/stable/how-to/writing_hook_functions.html#hook-wrappers-executing-around-other-hooks>
+pub(crate) fn is_pytest_hookimpl_wrapper(decorator: &Decorator, semantic: &SemanticModel) -> bool {
+    let Expr::Call(call) = &decorator.expression else {
+        return false;
+    };
+
+    // Check if it's pytest.hookimpl
+    let is_hookimpl = semantic
+        .resolve_qualified_name(&call.func)
+        .is_some_and(|name| matches!(name.segments(), ["pytest", "hookimpl"]));
+
+    if !is_hookimpl {
+        return false;
+    }
+
+    let wrapper = call.arguments.find_argument_value("wrapper", 6);
+    let hookwrapper = call.arguments.find_argument_value("hookwrapper", 1);
+
+    wrapper.or(hookwrapper).is_some_and(is_const_true)
+}
+
 /// Whether the currently checked `func` is likely to be a Pytest test.
 ///
 /// A normal Pytest test function is one whose name starts with `test` and is either:

crates/ruff_linter/src/rules/flake8_pytest_style/mod.rs

@@ -1,5 +1,5 @@
 //! Rules from [flake8-pytest-style](https://pypi.org/project/flake8-pytest-style/).
-mod helpers;
+pub(crate) mod helpers;
 pub(crate) mod rules;
 pub mod settings;
 pub mod types;