Switch to tox

.github/workflows/benchmark.yml

@@ -28,7 +28,7 @@ jobs:
       IRIS_TEST_DATA_PATH: benchmarks/iris-test-data
       IRIS_TEST_DATA_VERSION: "2.19"
       # Lets us manually bump the cache to rebuild
-      ENV_CACHE_BUILD: "0"
+      ENV_CACHE_BUILD: "1"
       TEST_DATA_CACHE_BUILD: "2"
 
     steps:
@@ -37,16 +37,16 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Install ASV & Nox
+      - name: Install ASV & tox
         run: |
-          pip install asv nox
+          pip install asv tox
 
       - name: Cache environment directories
         id: cache-env-dir
         uses: actions/cache@v3
         with:
           path: |
-            .nox
+            .tox
             benchmarks/.asv/env
             $CONDA/pkgs
           key: ${{ runner.os }}-${{ hashFiles('requirements/') }}-${{ env.ENV_CACHE_BUILD }}

.github/workflows/ci-tests.yml

@@ -35,18 +35,18 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-latest"]
-        python-version: ["3.11"]
-        session: ["doctest", "gallery", "linkcheck"]
+        python-version: ["311"]
+        session: ["docs-tests", "docs-linkcheck", "gallery_tests"]
         include:
           - os: "ubuntu-latest"
-            python-version: "3.11"
+            python-version: "311"
             session: "tests"
-            coverage: "--coverage"
+            posargs: "--cov=lib/iris --cov-report=xml"
           - os: "ubuntu-latest"
-            python-version: "3.10"
+            python-version: "310"
             session: "tests"
           - os: "ubuntu-latest"
-            python-version: "3.9"
+            python-version: "39"
             session: "tests"
 
     env:
@@ -63,7 +63,7 @@ jobs:
           CACHE_WEEKS: 2
         run: |
           echo "CACHE_PERIOD=$(date +%Y).$(expr $(date +%U) / ${CACHE_WEEKS})" >> ${GITHUB_ENV}
-          echo "LOCK_FILE=requirements/locks/py$(echo ${{ matrix.python-version }} | tr -d '.')-linux-64.lock" >> ${GITHUB_ENV}
+          echo "LOCK_FILE=requirements/locks/py$(echo ${{ matrix.python-version }})-linux-64.lock" >> ${GITHUB_ENV}
 
       - name: "data cache"
         uses: ./.github/workflows/composite/iris-data-cache
@@ -91,10 +91,10 @@ jobs:
       - name: "conda environment cache"
         uses: ./.github/workflows/composite/conda-env-cache
         with:
-          cache_build: 0
+          cache_build: 1
           cache_period: ${{ env.CACHE_PERIOD }}
           env_name: ${{ env.ENV_NAME }}
-          install_packages: "cartopy nox pip"
+          install_packages: "cartopy tox'<4'"
 
       - name: "conda info"
         run: |
@@ -108,8 +108,8 @@ jobs:
           cache_period: ${{ env.CACHE_PERIOD }}
           env_name: ${{ env.ENV_NAME }}
 
-      - name: "nox cache"
-        uses: ./.github/workflows/composite/nox-cache
+      - name: "tox cache"
+        uses: ./.github/workflows/composite/tox-cache
         with:
           cache_build: 2
           env_name: ${{ env.ENV_NAME }}
@@ -134,11 +134,9 @@ jobs:
           cat ${MPL_RC}
 
       - name: "iris ${{ matrix.session }}"
-        env:
-          PY_VER: ${{ matrix.python-version }}
         run: |
-          nox --session ${{ matrix.session }} -- --verbose ${{ matrix.coverage }}
+            tox -e py${{ matrix.python-version }}-${{ matrix.session }} -- ${{ matrix.posargs }}
 
       - name: Upload coverage report
         uses: codecov/codecov-action@v3
-        if: ${{ matrix.coverage }}
+        if: contains(${{ matrix.posargs }}, "--cov=lib/iris --cov-report=xml")

.github/workflows/ci-wheels.yml

@@ -52,7 +52,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.10", "3.11"]
+        python-version: ["39", "310", "311"]
         session: ["wheel"]
     env:
       ENV_NAME: "ci-wheels"
@@ -72,7 +72,7 @@ jobs:
           CACHE_WEEKS: 2
       run: |
         echo "CACHE_PERIOD=$(date +%Y).$(expr $(date +%U) / ${CACHE_WEEKS})" >> ${GITHUB_ENV}
-        echo "LOCK_FILE=requirements/locks/py$(echo ${{ matrix.python-version }} | tr -d '.')-linux-64.lock" >> ${GITHUB_ENV}
+        echo "LOCK_FILE=requirements/locks/py$(echo ${{ matrix.python-version }})-linux-64.lock" >> ${GITHUB_ENV}
 
     - name: "conda package cache"
       uses: ./.github/workflows/composite/conda-pkg-cache
@@ -93,23 +93,21 @@ jobs:
     - name: "conda environment cache"
       uses: ./.github/workflows/composite/conda-env-cache
       with:
-        cache_build: 0
+        cache_build: 1
         cache_period: ${{ env.CACHE_PERIOD }}
         env_name: ${{ env.ENV_NAME }}
-        install_packages: "nox pip"
+        install_packages: "tox'<4' pip"
 
-    - name: "nox cache"
-      uses: ./.github/workflows/composite/nox-cache
+    - name: "tox cache"
+      uses: ./.github/workflows/composite/tox-cache
       with:
         cache_build: 1
         env_name: ${{ env.ENV_NAME }}
         lock_file: ${{ env.LOCK_FILE }}
 
-    - name: "nox install and test wheel"
-      env:
-        PY_VER: ${{ matrix.python-version }}
+    - name: "tox install and test wheel"
       run: |
-        nox --session ${{ matrix.session }} -- --verbose
+        tox -e py${{ matrix.python-version }}-${{ matrix.session }}
 
   show-artifacts:
     needs: build

.github/workflows/composite/nox-cache/action.yml → .github/workflows/composite/tox-cache/action.yml

@@ -1,9 +1,9 @@
-name: "nox cache"
-description: "cache the nox test environments"
+name: "tox cache"
+description: "cache the tox test environments"
 
 inputs:
   cache_build:
-    description: "nox cache build number"
+    description: "tox cache build number"
     required: false
     default: "0"
   env_name:
@@ -18,5 +18,5 @@ runs:
   steps:
     - uses: actions/cache@v3
       with:
-        path: ${{ github.workspace }}/.nox
-        key: ${{ runner.os }}-nox-${{ inputs.env_name }}-s${{ matrix.session }}-py${{ matrix.python-version }}-b${{ inputs.cache_build }}-${{ hashFiles(inputs.lock_file) }}
+        path: ${{ github.workspace }}/.tox
+        key: ${{ runner.os }}-tox-${{ inputs.env_name }}-s${{ matrix.session }}-py${{ matrix.python-version }}-b${{ inputs.cache_build }}-${{ hashFiles(inputs.lock_file) }}

MANIFEST.in

@@ -20,7 +20,7 @@ exclude codecov.yml
 include COPYING
 include COPYING.LESSER
 exclude Makefile
-exclude noxfile.py
+exclude tox.ini
 
 # files required to build iris.std_names module
 include etc/cf-standard-name-table.xml

benchmarks/README.md

@@ -21,7 +21,7 @@ by the PR. (This run is managed by
 [the aforementioned GitHub Action](../.github/workflows/benchmark.yml)).
 
 `asv ...` commands must be run from this directory. You will need to have ASV
-installed, as well as Nox (see
+installed, as well as tox (see
 [Benchmark environments](#benchmark-environments)).
 
 The benchmark runner ([bm_runner.py](./bm_runner.py)) provides conveniences for
@@ -107,13 +107,12 @@ suites for the UK Met Office NG-VAT project.
 ## Benchmark environments
 
 We have disabled ASV's standard environment management, instead using an
-environment built using the same Nox scripts as Iris' test environments. This
-is done using ASV's plugin architecture - see
+environment built using tox. This is done using ASV's plugin architecture - see
 [asv_delegated_conda.py](asv_delegated_conda.py) and the extra config items in
 [asv.conf.json](asv.conf.json).
 
 (ASV is written to control the environment(s) that benchmarks are run in -
 minimising external factors and also allowing it to compare between a matrix
 of dependencies (each in a separate environment). We have chosen to sacrifice
 these features in favour of testing each commit with its intended dependencies,
-controlled by Nox + lock-files).
+controlled by tox + lock-files).

benchmarks/asv.conf.json

@@ -20,9 +20,9 @@
     //  * No build-time environment variables.
     //  * Is run in the same environment as the ASV install itself.
     "delegated_env_commands": [
-        "PY_VER=3.11 nox --envdir={conf_dir}/.asv/env/nox01 --session=tests --install-only --no-error-on-external-run --verbose"
+        "tox -c {conf_dir}/.. --devenv={conf_dir}/.asv/env/tox01/bm_env -e py311 --verbose"
     ],
     // The parent directory of the above environment.
     //  The most recently modified environment in the directory will be used.
-    "delegated_env_parent": "{conf_dir}/.asv/env/nox01"
+    "delegated_env_parent": "{conf_dir}/.asv/env/tox01"
 }

benchmarks/bm_runner.py

@@ -62,27 +62,29 @@ def _prep_data_gen_env() -> None:
     """
 
     root_dir = BENCHMARKS_DIR.parent
-    python_version = "3.11"
+    python_version = "311"
     data_gen_var = "DATA_GEN_PYTHON"
     if data_gen_var in environ:
         print("Using existing data generation environment.")
     else:
         print("Setting up the data generation environment ...")
-        # Get Nox to build an environment for the `tests` session, but don't
-        #  run the session. Will re-use a cached environment if appropriate.
+        # Get tox to build an environment. It will re-use a cached environment
+        # if appropriate.
         _subprocess_run_print(
             [
-                "nox",
-                f"--noxfile={root_dir / 'noxfile.py'}",
-                "--session=tests",
-                "--install-only",
-                f"--python={python_version}",
+                "tox",
+                "-c",
+                str(root_dir),
+                "-e",
+                f"py{python_version}",
             ]
         )
         # Find the environment built above, set it to be the data generation
         #  environment.
         data_gen_python = next(
-            (root_dir / ".nox").rglob(f"tests*/bin/python{python_version}")
+            (root_dir / ".tox").rglob(
+                f"py{python_version}/bin/python{python_version[:1]}.{python_version[1:]}"
+            )
         ).resolve()
         environ[data_gen_var] = str(data_gen_python)
 
@@ -112,7 +114,7 @@ def _prep_data_gen_env() -> None:
 
 def _setup_common() -> None:
     _check_requirements("asv")
-    _check_requirements("nox")
+    _check_requirements("tox")
 
     _prep_data_gen_env()
 
@@ -154,7 +156,7 @@ def _asv_compare(*commits: str, overnight_mode: bool = False) -> None:
 
 
 class _SubParserGenerator(ABC):
-    """Convenience for holding all the necessary argparse info in 1 place."""
+    """Convenience for holding all the necessary argparse info in one place."""
 
     name: str = NotImplemented
     description: str = NotImplemented

docs/src/common_links.inc

@@ -37,6 +37,7 @@
 .. _sphinx: https://www.sphinx-doc.org/en/master/
 .. _sphinx-apidoc: https://github.com/sphinx-contrib/apidoc
 .. _test-iris-imagehash: https://github.com/SciTools/test-iris-imagehash
+.. _tox: https://tox.readthedocs.io/en/latest/
 .. _using git: https://docs.github.com/en/github/using-git
 .. _requirements: https://github.com/SciTools/iris/tree/main/requirements
 .. _CF-UGRID: https://ugrid-conventions.github.io/ugrid-conventions/

docs/src/conf.py

@@ -384,6 +384,7 @@ def _dotv(version):
     "http://www.nationalarchives.gov.uk/doc/open-government-licence",
     "https://www.metoffice.gov.uk/",
     "https://biggus.readthedocs.io/",
+    "https://stickler-ci.com/",
 ]
 
 # list of sources to exclude from the build.

docs/src/developers_guide/contributing_pull_request_checklist.rst

@@ -30,7 +30,7 @@ is merged.  Before submitting a pull request please consider the following:
    :ref:`code_formatting`.
 
 #. **Check all new dependencies added to the** `requirements`_ **yaml
-   files.**  If dependencies have been added then new nox testing lockfiles
+   files.**  If dependencies have been added then new testing lockfiles
    should be generated too, see :ref:`gha_test_env`.
 
 #. **Check the source documentation been updated to explain all new or changed