fix tests for strict exception groups (#42)

* fix tests to work with strict and non-strict exception groups
* add python 3.12 to build, drop python 3.7 (end of life)
* upgrade dev dependencies where needed for newer python versions

---------

Co-authored-by: John Belmonte <[email protected]>

Author: VincentVanlaer

.github/workflows/ci.yml

@@ -10,9 +10,10 @@ jobs:
   build_and_test_pinned:
     runs-on: ${{ matrix.os }}
     strategy:
+      fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python-version: ['3.7', '3.8', '3.9', '3.10']  # 'pypy-3.7'
+        python-version: ['3.8', '3.9', '3.10', '3.11']  # 'pypy-3.7'
     steps:
       - uses: actions/checkout@v3
       - name: Setup Python
@@ -31,7 +32,7 @@ jobs:
         # macos-latest disabled due to unexplained timeout
         # https://github.com/python-trio/purerpc/issues/39
         os: [ubuntu-latest]  # TODO: windows-latest
-        python-version: ['3.11']
+        python-version: ['3.12']
     steps:
       - uses: actions/checkout@v3
       - name: Setup Python

requirements_test.txt

@@ -1,6 +1,6 @@
 #
-# This file is autogenerated by pip-compile with python 3.7
-# To update, run:
+# This file is autogenerated by pip-compile with Python 3.8
+# by the following command:
 #
 #    pip-compile --extra=dev --output-file=requirements_test.txt setup.py
 #
@@ -15,17 +15,21 @@ attrs==21.4.0
     #   outcome
     #   pytest
     #   trio
+build==1.2.1
+    # via pip-tools
 cffi==1.15.0
     # via cryptography
 click==8.1.2
     # via pip-tools
 cryptography==36.0.2
     # via trustme
-grpcio==1.44.0
+exceptiongroup==1.2.0 ; python_version < "3.11"
+    # via purerpc (setup.py)
+grpcio==1.62.1
     # via
     #   grpcio-tools
     #   purerpc (setup.py)
-grpcio-tools==1.44.0
+grpcio-tools==1.62.1
     # via purerpc (setup.py)
 h2==3.2.0
     # via purerpc (setup.py)
@@ -39,37 +43,35 @@ idna==3.3
     #   trio
     #   trustme
 importlib-metadata==4.11.3
-    # via
-    #   click
-    #   pep517
-    #   pluggy
-    #   pytest
+    # via build
 iniconfig==1.1.1
     # via pytest
 outcome==1.1.0
     # via trio
 packaging==21.3
-    # via pytest
-pep517==0.12.0
-    # via pip-tools
-pip-tools==6.6.0
+    # via
+    #   build
+    #   pytest
+pip-tools==7.4.1
     # via purerpc (setup.py)
 pluggy==1.0.0
     # via pytest
-protobuf==3.20.0
+protobuf==4.25.3
     # via grpcio-tools
 py==1.11.0
     # via pytest
 pycparser==2.21
     # via cffi
 pyparsing==3.0.8
     # via packaging
+pyproject-hooks==1.0.0
+    # via
+    #   build
+    #   pip-tools
 pytest==7.1.1
     # via purerpc (setup.py)
 python-forge==18.6.0
     # via purerpc (setup.py)
-six==1.16.0
-    # via grpcio
 sniffio==1.2.0
     # via
     #   anyio
@@ -80,24 +82,20 @@ tblib==1.7.0
     # via purerpc (setup.py)
 tomli==2.0.1
     # via
-    #   pep517
+    #   build
+    #   pip-tools
+    #   pyproject-hooks
     #   pytest
 trio==0.20.0
     # via purerpc (setup.py)
 trustme==0.9.0
     # via purerpc (setup.py)
-typing-extensions==4.1.1
-    # via
-    #   anyio
-    #   importlib-metadata
-uvloop==0.16.0 ; platform_system != "Windows"
+uvloop==0.19.0 ; platform_system != "Windows"
     # via purerpc (setup.py)
 wheel==0.37.1
     # via pip-tools
 zipp==3.8.0
-    # via
-    #   importlib-metadata
-    #   pep517
+    # via importlib-metadata
 
 # The following packages are considered to be unsafe in a requirements file:
 # pip

setup.py

@@ -35,11 +35,11 @@ def main():
             "Operating System :: POSIX :: Linux",
             "Programming Language :: Python",
             "Programming Language :: Python :: 3 :: Only",
-            "Programming Language :: Python :: 3.7",
             "Programming Language :: Python :: 3.8",
             "Programming Language :: Python :: 3.9",
             "Programming Language :: Python :: 3.10",
             "Programming Language :: Python :: 3.11",
+            "Programming Language :: Python :: 3.12",
             "Programming Language :: Python :: Implementation :: CPython",
             "Programming Language :: Python :: Implementation :: PyPy",
             "Framework :: AsyncIO",
@@ -77,6 +77,7 @@ def main():
                 "grpcio-tools<=1.26",
             ],
             'dev': [
+                "exceptiongroup; python_version<'3.11'",
                 "pytest",
                 "grpcio",
                 "grpcio-tools",

tests/exceptiongroups.py

@@ -0,0 +1,31 @@
+from typing import Iterable
+from contextlib import contextmanager
+import sys
+
+if sys.version_info < (3, 11):
+    from exceptiongroup import ExceptionGroup
+
+
+def _unroll_exceptions(
+    exceptions: Iterable[Exception]
+) -> Iterable[Exception]:
+    res: list[Exception] = []
+    for exc in exceptions:
+        if isinstance(exc, ExceptionGroup):
+            res.extend(_unroll_exceptions(exc.exceptions))
+
+        else:
+            res.append(exc)
+    return res
+
+
+@contextmanager
+def unwrap_exceptiongroups_single():
+    try:
+        yield
+    except ExceptionGroup as e:
+        exceptions = _unroll_exceptions(e.exceptions)
+
+        assert len(exceptions) == 1, "Exception group contains multiple exceptions"
+
+        raise exceptions[0]

tests/test_echo.py

@@ -8,6 +8,7 @@
 import purerpc
 from purerpc.test_utils import run_purerpc_service_in_process, run_grpc_service_in_process, \
     async_iterable_to_list, random_payload, grpc_client_parallelize, purerpc_channel, purerpc_client_parallelize, grpc_channel
+from .exceptiongroups import unwrap_exceptiongroups_single
 
 pytestmark = pytest.mark.anyio
 
@@ -200,7 +201,7 @@ async def test_purerpc_client_disconnect(echo_pb2, echo_grpc):
         port = await tg.start(server.serve_async)
 
         # client
-        with pytest.raises(anyio.ClosedResourceError):
+        with pytest.raises(anyio.ClosedResourceError), unwrap_exceptiongroups_single():
             async with purerpc.insecure_channel("localhost", port) as channel:
                 stub = echo_grpc.EchoStub(channel)
 

tests/test_errors.py

@@ -5,6 +5,7 @@
 import purerpc
 from purerpc.test_utils import run_purerpc_service_in_process, run_grpc_service_in_process, grpc_channel, \
     grpc_client_parallelize, purerpc_channel
+from .exceptiongroups import unwrap_exceptiongroups_single
 
 pytestmark = pytest.mark.anyio
 
@@ -88,7 +89,7 @@ async def generator():
 
     stub = greeter_grpc.GreeterStub(channel)
 
-    with pytest.raises(ValueError, match="oops"):
+    with pytest.raises(ValueError, match="oops"), unwrap_exceptiongroups_single():
         async with stub.SayHelloToMany(generator()) as aiter:
             async for resp in aiter:
                 if resp.message == "2":