Make CI setup work again

Do not run CI on both push and PR.
Use latest version of actions.
Iterate over oldest and newest supported Python versions.
Iterate over oldest and newest supported cocotb versions.
Use color output for cocotb tests.

.github/workflows/tests.yml

@@ -1,13 +1,11 @@
 # Copyright cocotb contributors
 # Licensed under the Revised BSD License, see LICENSE for details.
 # SPDX-License-Identifier: BSD-3-Clause
+
 name: Tests
 
 on:
   push:
-    # branches:
-    #   - master
-    #   - 'stable/**'
   pull_request:
     branches:
       - master
@@ -23,7 +21,7 @@ jobs:
     if:
       github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
 
-    name: ${{ matrix.extra_name }}${{ matrix.sim }} (${{ matrix.sim-version }}) | ${{ matrix.os }} | Python ${{ matrix.python-version }} ${{ matrix.may_fail && '| May Fail' || '' }}
+    name: ${{ matrix.extra_name }}cocotb ${{matrix.cocotb-version }} | ${{ matrix.sim }} (${{ matrix.sim-version }}) | ${{ matrix.os }} | Python ${{ matrix.python-version }} ${{ matrix.may_fail && '| May Fail' || '' }}
     runs-on: ${{ matrix.os }}
     env:
       SIM: ${{ matrix.sim }}
@@ -32,23 +30,26 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.6", "3.12"]
+        # NOTE: align with versions in noxfile.py:
+        cocotb-version: ["1.6.0", "1.8.1"]
         include:
         - sim: icarus
           sim-version: apt
-          # python-version: "3.6"
           lang: verilog
           os: ubuntu-20.04
+    timeout-minutes: 10
+
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-python@v4
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install cocotb requirements
       env:
         DEBIAN_FRONTEND: noninteractive
       run: |
         sudo apt-get update
-        sudo apt-get install --yes g++ make
+        sudo apt-get install --yes --no-install-recommends g++ make
     - name: Set up Icarus (apt)
       if: matrix.sim == 'icarus' && matrix.sim-version == 'apt'
       env:
@@ -57,8 +58,10 @@ jobs:
         sudo apt-get install --yes --no-install-recommends iverilog
     - name: Install testing requirements
       run: |
-        pip install nox
+        python -m pip install nox
     - name: Run tests
+      env:
+        COCOTB_ANSI_OUTPUT: 1
       continue-on-error: ${{ matrix.may_fail || false }}
       run: |
-        nox -e tests
+        nox --session "tests(cocotb='${{ matrix.cocotb-version }}')"

noxfile.py

@@ -2,8 +2,9 @@
 
 
 @nox.session
-def tests(session):
-    session.install("pytest", "coverage")
+@nox.parametrize("cocotb", ["1.6.0", "1.8.1"])
+def tests(session, cocotb):
+    session.install("pytest", "coverage", f"cocotb=={cocotb}")
     session.install(".")
     session.run("make", external=True)