ci: resolve the declared dependency floors on every matrix entry

.github/workflows/_checks.yml

@@ -39,6 +39,35 @@ jobs:
       - run: just install
       - run: just test-ci
 
+  floors:
+    # Every other job resolves newest, so the declared floors are a claim nothing installs.
+    # This one resolves the bottom of each range, on every matrix entry: wheel coverage is
+    # per interpreter, so two interpreters resolving the same versions can still disagree
+    # on whether those versions install.
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version:
+          - "3.10"
+          - "3.11"
+          - "3.12"
+          - "3.13"
+          - "3.14"
+    steps:
+      - uses: actions/checkout@v6
+      - uses: astral-sh/setup-uv@v8.2.0
+        with:
+          enable-cache: true
+          cache-dependency-glob: "**/pyproject.toml"
+      - run: uv python install ${{ matrix.python-version }}
+      - run: uv python pin ${{ matrix.python-version }}
+      # --no-build so a floor with no wheel for this interpreter fails here instead of
+      # quietly compiling its sdist; --no-install-project because that flag would refuse to
+      # build this project too, and the tests import it from the checkout.
+      - run: uv sync --all-extras --no-install-project --resolution lowest-direct --no-build
+      - run: uv run --no-sync pytest
+
   links:
     runs-on: ubuntu-latest
     steps:

justfile

@@ -21,7 +21,7 @@ lint-ci:
 # module; rewrite it to a package-relative import so the stubs import cleanly
 # as tests.protos.greeter_pb2_grpc.
 proto:
-    uv run python -m grpc_tools.protoc -Itests/protos --python_out=tests/protos --grpc_python_out=tests/protos tests/protos/greeter.proto
+    uv run --with grpcio-tools python -m grpc_tools.protoc -Itests/protos --python_out=tests/protos --grpc_python_out=tests/protos tests/protos/greeter.proto
     sed -i.bak 's/^import greeter_pb2 as greeter__pb2$/from tests.protos import greeter_pb2 as greeter__pb2/' tests/protos/greeter_pb2_grpc.py
     rm -f tests/protos/greeter_pb2_grpc.py.bak
 

pyproject.toml

@@ -18,10 +18,8 @@ classifiers = [
     "Topic :: Software Development :: Libraries",
 ]
 dependencies = [
-    # grpcio ships no cp314 wheel before 1.75.1, so a resolver picks an sdist that cannot build
-    # rather than reporting a conflict.
-    "grpcio>=1.48,<2; python_version < '3.14'",
-    "grpcio>=1.75.1,<2; python_version >= '3.14'",
+    # The committed test stubs under tests/protos refuse to import below 1.82.1.
+    "grpcio>=1.82.1,<2",
     "modern-di>=3.1,<4",
 ]
 version = "0"
@@ -34,7 +32,9 @@ Issues = "https://github.com/modern-python/modern-di-grpc/issues"
 Changelog = "https://github.com/modern-python/modern-di-grpc/releases"
 
 [dependency-groups]
-dev = ["pytest", "pytest-cov", "pytest-asyncio", "grpcio-tools", "protobuf"]
+# Floored so `uv sync --resolution lowest-direct` resolves a usable harness, not each name's first release.
+# grpcio-tools is not here: it pins grpcio to its own version, which would hide the floors above.
+dev = ["pytest>=8", "pytest-cov>=5", "pytest-asyncio>=0.24", "protobuf>=7.35"]
 lint = ["ty", "ruff", "eof-fixer", "typing-extensions"]
 
 [build-system]