pin tox versions and update unit/int file specifiers

.github/workflows/tox.yml

@@ -40,7 +40,7 @@ jobs:
           python-version: ${{ matrix.py }}
       - uses: actions/checkout@v4
       - name: Install tox-gh
-        run: python -m pip install tox-gh
+        run: python -m pip install tox-gh tox==4.12.1
       - name: Setup test suite
         run: tox r -vv --notest
       - name: Run test suite
@@ -53,7 +53,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Run code coverage
         run: |
-          python -m pip install tox
+          python -m pip install tox==4.12.1
           tox -e coverage
           coverage=$(jq .totals.percent_covered coverage.json | cut -c1-4)
           echo "Code coverage: $coverage%" >> $GITHUB_STEP_SUMMARY

dev_requirements

@@ -11,4 +11,4 @@ pylint<=2.13.8
 flake8
 pytest-xdist
 pytest-rerunfailures
-tox
+tox==4.12.1

tox.ini

@@ -70,8 +70,8 @@ commands =
     az -v
     # run tests
     # You can pass additional positional args to pytest using `-- {args}`
-    unit: pytest -k _unit ./azext_iot/tests {posargs}
-    int: pytest -k _int ./azext_iot/tests {posargs}
+    unit: pytest -k _unit.py ./azext_iot/tests {posargs}
+    int: pytest -k _int.py ./azext_iot/tests {posargs}
 
 # tox-gh matrix (github action -> tox python environment)
 [gh]