diff --git a/.github/workflows/macos.yaml b/.github/workflows/macos.yaml
index 77973d2b..6b1a1d4a 100644
--- a/.github/workflows/macos.yaml
+++ b/.github/workflows/macos.yaml
@@ -31,8 +31,6 @@ on:
 jobs:
   ci:
     runs-on: macos-latest
-    env:
-      PY_VERSION: "${{ matrix.python-version }}"
     strategy:
       matrix:
         python-version:
@@ -58,8 +56,35 @@ jobs:
           brew unlink gcc
           brew link gcc
 
-      - name: Run "install" to setup Python environment and tooling
-        run: scripts/macos/setup.sh
+      - name: Show Python version
+        run: |
+          python --version
+
+      - name: Update host Python packaging
+        run: |
+          python -m pip install --upgrade "cmake >= 3.25.2" "nox >= 2022.11.21" numpy pip
+
+      - name: Unit tests in Python 3.9
+        if: matrix.python-version == '3.9'
+        run: |
+          nox --session unit-3.9
+
+      - name: Unit tests in Python 3.10
+        if: matrix.python-version == '3.10'
+        run: |
+          nox --session unit-3.10
+
+      - name: Unit tests AND line coverage in Python 3.11
+        if: matrix.python-version == '3.11'
+        run: |
+          nox --session cover
 
-      - name: Run tests
-        run: scripts/macos/test.sh
+      - name: Functional tests in Python 3.11
+        if: matrix.python-version == '3.11'
+        run: |
+          nox --session functional-3.11
+
+      - name: Run all doctests
+        if: matrix.python-version == '3.11'
+        run: |
+          nox --session doctest
diff --git a/scripts/macos/setup.sh b/scripts/macos/setup.sh
deleted file mode 100755
index 7dbb4697..00000000
--- a/scripts/macos/setup.sh
+++ /dev/null
@@ -1,30 +0,0 @@
-#!/bin/bash
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-set -e -x
-
-if [[ -z "${Python_ROOT_DIR}" ]]; then
-    echo "Python_ROOT_DIR environment variable should be set by the caller." >&2
-    exit 1
-fi
-
-PIP_CMD="${Python_ROOT_DIR}/bin/python -m pip"
-echo "PIP_CMD=${PIP_CMD}"
-
-# Make sure our installed CPython is set up for testing.
-${PIP_CMD} install --ignore-installed virtualenv pip
-${PIP_CMD} install --upgrade "nox >= 2022.11.21" numpy
-# Make sure there is a working ``cmake`` on the ``${PATH}``.
-${PIP_CMD} install --upgrade "cmake >= 3.25.2"
-command -v cmake
diff --git a/scripts/macos/test.sh b/scripts/macos/test.sh
deleted file mode 100755
index 48a7be77..00000000
--- a/scripts/macos/test.sh
+++ /dev/null
@@ -1,38 +0,0 @@
-#!/bin/bash
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-set -e -x
-
-if [[ -z "${PY_VERSION}" ]]; then
-    echo "PY_VERSION environment variable should be set by the caller." >&2
-    exit 1
-fi
-
-if [[ -z "${Python_ROOT_DIR}" ]]; then
-    echo "Python_ROOT_DIR environment variable should be set by the caller." >&2
-    exit 1
-fi
-
-if [[ "${PY_VERSION}" == "3.9" ]]; then
-    "${Python_ROOT_DIR}/bin/nox" --session "unit-3.9"
-elif [[ "${PY_VERSION}" == "3.10" ]]; then
-    "${Python_ROOT_DIR}/bin/nox" --session "unit-3.10"
-elif [[ "${PY_VERSION}" == "3.11" ]]; then
-    "${Python_ROOT_DIR}/bin/nox" --session cover
-    "${Python_ROOT_DIR}/bin/nox" --session "functional-3.11"
-    "${Python_ROOT_DIR}/bin/nox" --session doctest
-else
-    echo "Unexpected version: ${PY_VERSION}" >&2
-    exit 1
-fi