diff --git a/pyproject.toml b/pyproject.toml
index 03359c6..a804cec 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,5 +24,6 @@ packages = ["src/breakshaft"]
 dev = [
     "mypy>=1.16.1",
     "pytest>=8.4.1",
+    "pytest-asyncio>=1.1.0",
     "pytest-cov>=6.2.1",
 ]
diff --git a/tests/test_ctxmanager.py b/tests/test_ctxmanager.py
new file mode 100644
index 0000000..6ece635
--- /dev/null
+++ b/tests/test_ctxmanager.py
@@ -0,0 +1,86 @@
+from contextlib import contextmanager, asynccontextmanager
+from dataclasses import dataclass
+from typing import Any, Generator, AsyncGenerator
+
+import pytest
+
+from src.breakshaft.convertor import ConvRepo
+
+pytest_plugins = ('pytest_asyncio',)
+
+
+@dataclass
+class A:
+    a: int
+
+
+@dataclass
+class B:
+    b: float
+
+
+def test_sync_ctxmanager():
+    repo = ConvRepo()
+
+    @repo.mark_injector()
+    def b_to_a(b: B) -> A:
+        return A(int(b.b))
+
+    @repo.mark_injector()
+    def a_to_b(a: A) -> B:
+        return B(float(a.a))
+
+    int_to_a_finalized = [False]
+
+    @repo.mark_injector()
+    @contextmanager
+    def int_to_a(i: int) -> Generator[A, Any, None]:
+        yield A(i)
+        int_to_a_finalized[0] = True
+
+    def consumer(dep: A) -> int:
+        return dep.a
+
+    fn1 = repo.get_conversion((B,), consumer, force_commutative=True, force_async=False, allow_async=False)
+    dep = fn1(B(42.1))
+    assert dep == 42
+    assert not int_to_a_finalized[0]
+
+    fn2 = repo.get_conversion((int,), consumer, force_commutative=True, force_async=False, allow_async=False)
+    dep = fn2(123)
+    assert dep == 123
+    assert int_to_a_finalized[0]
+
+
+@pytest.mark.asyncio
+async def test_async_ctxmanager():
+    repo = ConvRepo()
+
+    @repo.mark_injector()
+    def b_to_a(b: B) -> A:
+        return A(int(b.b))
+
+    @repo.mark_injector()
+    def a_to_b(a: A) -> B:
+        return B(float(a.a))
+
+    int_to_a_finalized = [False]
+
+    @repo.mark_injector()
+    @asynccontextmanager
+    async def int_to_a(i: int) -> AsyncGenerator[A, Any]:
+        yield A(i)
+        int_to_a_finalized[0] = True
+
+    def consumer(dep: A) -> int:
+        return dep.a
+
+    fn1 = repo.get_conversion((B,), consumer, force_commutative=True, force_async=False, allow_async=True)
+    dep = fn1(B(42.1))
+    assert dep == 42
+    assert not int_to_a_finalized[0]
+
+    fn2 = repo.get_conversion((int,), consumer, force_commutative=True, force_async=False, allow_async=True)
+    dep = await fn2(123)
+    assert dep == 123
+    assert int_to_a_finalized[0]
diff --git a/uv.lock b/uv.lock
index 5907a37..7f61796 100644
--- a/uv.lock
+++ b/uv.lock
@@ -4,7 +4,7 @@ requires-python = ">=3.13"
 
 [[package]]
 name = "breakshaft"
-version = "0.1.0.post1"
+version = "0.1.0.post2"
 source = { editable = "." }
 dependencies = [
     { name = "hatchling" },
@@ -15,6 +15,7 @@ dependencies = [
 dev = [
     { name = "mypy" },
     { name = "pytest" },
+    { name = "pytest-asyncio" },
     { name = "pytest-cov" },
 ]
 
@@ -28,6 +29,7 @@ requires-dist = [
 dev = [
     { name = "mypy", specifier = ">=1.16.1" },
     { name = "pytest", specifier = ">=8.4.1" },
+    { name = "pytest-asyncio", specifier = ">=1.1.0" },
     { name = "pytest-cov", specifier = ">=6.2.1" },
 ]
 
@@ -216,6 +218,18 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/29/16/c8a903f4c4dffe7a12843191437d7cd8e32751d5de349d45d3fe69544e87/pytest-8.4.1-py3-none-any.whl", hash = "sha256:539c70ba6fcead8e78eebbf1115e8b589e7565830d7d006a8723f19ac8a0afb7", size = 365474, upload-time = "2025-06-18T05:48:03.955Z" },
 ]
 
+[[package]]
+name = "pytest-asyncio"
+version = "1.1.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "pytest" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/4e/51/f8794af39eeb870e87a8c8068642fc07bce0c854d6865d7dd0f2a9d338c2/pytest_asyncio-1.1.0.tar.gz", hash = "sha256:796aa822981e01b68c12e4827b8697108f7205020f24b5793b3c41555dab68ea", size = 46652, upload-time = "2025-07-16T04:29:26.393Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/c7/9d/bf86eddabf8c6c9cb1ea9a869d6873b46f105a5d292d3a6f7071f5b07935/pytest_asyncio-1.1.0-py3-none-any.whl", hash = "sha256:5fe2d69607b0bd75c656d1211f969cadba035030156745ee09e7d71740e58ecf", size = 15157, upload-time = "2025-07-16T04:29:24.929Z" },
+]
+
 [[package]]
 name = "pytest-cov"
 version = "6.2.1"