Use a dependency-group for testing

.coveragerc

@@ -5,3 +5,4 @@ omit =
     tests
     __init__.py
     scip.pyx
+patch = subprocess

.github/workflows/build_wheels.yml

@@ -44,7 +44,7 @@ jobs:
         uses: pypa/cibuildwheel@v2.21.1
         env:
           CIBW_ARCHS: ${{ matrix.arch }}
-          CIBW_TEST_REQUIRES: pytest
+          CIBW_TEST_GROUPS: test
           CIBW_TEST_COMMAND: "pytest {project}/tests"
           CIBW_MANYLINUX_*_IMAGE: manylinux_2_28
 

.github/workflows/coverage.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Prepare python environment
         run: |
           python -m pip install --upgrade pip
-          python -m pip install networkx cython pytest-cov numpy
+          python -m pip install --group coverage
 
       - name: Install PySCIPOpt
         run: |
@@ -47,7 +47,8 @@ jobs:
       - name: Run pyscipopt tests
         run: |
           sudo apt-get install tzdata locales -y && sudo locale-gen pt_PT && sudo update-locale # add pt_PT locale that is used in tests
-          coverage run -m pytest
+          coverage run -m pytest -nauto
+          coverage combine
           coverage report -m
           coverage xml
 

.github/workflows/integration-test.yml

@@ -34,14 +34,14 @@ jobs:
       - name: Prepare python environment
         run: |
           python -m pip install --upgrade pip
-          python -m pip install networkx pytest-cov numpy
+          python -m pip install --group test-full
 
       - name: Install PySCIPOpt
         run: python -m pip install .
 
       - name: Run pyscipopt tests
         run: |
-          py.test
+          py.test -nauto
 
   Windows-test:
     env:
@@ -70,7 +70,7 @@ jobs:
         shell: powershell
         run: |
           python -m pip install --upgrade pip
-          python -m pip install networkx pytest-cov numpy
+          python -m pip install --group test-full
 
       - name: Install PySCIPOpt
         shell: powershell
@@ -81,7 +81,7 @@ jobs:
       - name: Run pyscipopt tests
         shell: powershell
         run: |
-          py.test
+          py.test -nauto
 
   MacOS-test:
     runs-on: macos-latest
@@ -107,7 +107,7 @@ jobs:
       - name: Prepare python environment
         run: |
           python -m pip install --upgrade pip
-          python -m pip install networkx pytest-cov pytest numpy
+          python -m pip install --group test-full
 
       - name: Install PySCIPOpt
         run: |

.github/workflows/test-release.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Prepare python environment
         run: |
           python -m pip install --upgrade pip
-          python -m pip install wheel cython networkx pytest-cov build
+          python -m pip install wheel cython build
 
       - name: Build package
         run: |

.github/workflows/update-packages-and-documentation.yml

@@ -49,14 +49,14 @@ jobs:
       - name: Prepare python environment
         run: |
           python -m pip install --upgrade pip
-          python -m pip install wheel cython networkx pytest-cov
+          python -m pip install --group test-full
 
       - name: Install PySCIPOpt
         run: python -m pip install .
 
       - name: Run pyscipopt tests
         run: |
-          py.test
+          py.test -nauto
 
   windows-test:
     needs: release-integration-test
@@ -86,7 +86,7 @@ jobs:
         shell: powershell
         run: |
           python -m pip install --upgrade pip
-          python -m pip install wheel cython networkx pytest-cov
+          python -m pip install --group test-full
       - name: Install PySCIPOpt
         shell: powershell
         run: |
@@ -95,7 +95,7 @@ jobs:
       - name: Run pyscipopt tests
         shell: powershell
         run: |
-          py.test
+          py.test -nauto
 
 
   deploy-packages-and-generate-documentation:
@@ -117,7 +117,7 @@ jobs:
       - name: Prepare python environment
         run: |
           python -m pip install --upgrade pip
-          python -m pip install wheel cython networkx pytest-cov build
+          python -m pip install wheel cython build
 
       - name: Build package
         run: |

CHANGELOG.md

@@ -7,6 +7,7 @@
 - Implemented all binary operations between MatrixExpr and GenExpr
 - Fixed the type of @ matrix operation result from MatrixVariable to MatrixExpr.
 ### Changed
+- Add a PEP 735 dependency group for test dependencies in `pyproject.toml`
 - Speed up MatrixVariable.sum(axis=None) via quicksum
 ### Removed
 

INSTALL.md

@@ -116,17 +116,16 @@ Testing new installation
 ========================
 
 To test your brand-new installation of PySCIPOpt you need
-[pytest](https://pytest.org/) on your system.
+some dependencies which can be installed via pip. The testing
+dependencies are in the `test` dependency group.
 
-    pip install pytest
-
-Here is the complete [installation
-procedure](https://docs.pytest.org/en/latest/getting-started.html).
+    pip install --group test
 
 Tests can be run in the `PySCIPOpt` directory with: :
 
     py.test # all the available tests
     py.test tests/test_name.py # a specific tests/test_name.py (Unix)
+    py.test -nauto # run tests in parallel using all available cores
 
 Ideally, the status of your tests must be passed or skipped. Running
 tests with pytest creates the `__pycache__` directory in `tests` and,

docs/build.rst

@@ -177,19 +177,21 @@ To use debug information in PySCIPOpt you need to build it with the following co
 Testing the Installation
 ==========================
 
-To test your brand-new installation of PySCIPOpt you need `pytest <https://docs.pytest.org/en/stable/>`_
-on your system. To get pytest simply run the command:
+To test your brand-new installation of PySCIPOpt you need to
+install some dependencies via pip. The testing dependencies are in
+the `test` dependency group.
 
 .. code-block:: bash
 
-  pip install pytest
+  pip install --group test
 
 Tests can be run in the PySCIPOpt directory with the commands:
 
 .. code-block:: bash
 
   pytest # Will run all the available tests
   pytest tests/test_name.py # Will run a specific tests/test_name.py (Unix)
+  pytest -nauto # Will run tests in parallel using all available cores
 
 Ideally, the status of your tests must be passed or skipped.
 Running tests with pytest creates the __pycache__ directory in tests and, occasionally,

pyproject.toml

@@ -26,6 +26,21 @@ dynamic = ["version"]
 [project.urls]
 Homepage = "https://github.com/SCIP-Interfaces/PySCIPOpt"
 
+[dependency-groups]
+test = [
+    "pytest",
+    "pytest-xdist",
+]
+test-full = [
+    {"include-group" = "test" },
+    "networkx",  # only needed for a few tests
+]
+coverage = [
+    { "include-group" = "test-full" },
+    "coverage",
+    "cython",
+]
+
 [tool.pytest.ini_options]
 norecursedirs = ["check"]
 testpaths = ["tests"]

tests/test_logical.py

@@ -1,12 +1,7 @@
 from pyscipopt import Model
 from pyscipopt import quicksum
 
-try:
-    import pytest
-    itertools = pytest.importorskip("itertools")
-except ImportError:
-    import itertools
-product = itertools.product
+import pytest
 
 
 # Testing AND/OR/XOR constraints

tests/test_tsp.py

@@ -1,8 +1,7 @@
 from pyscipopt import Model, Conshdlr, quicksum, SCIP_RESULT
-
+import itertools
 import pytest
 
-itertools = pytest.importorskip("itertools")
 networkx = pytest.importorskip("networkx")
 
 EPS = 1.e-6