Enable testing on Windows and MacOS (#357)

Co-authored-by: Gleb Nikonorov <gleb.i.nikonorov@gmail.com>

.github/workflows/actions.yml

@@ -16,25 +16,83 @@ on:
 jobs:
   build_python:
     name: ${{ matrix.name }}
-    runs-on: ubuntu-18.04
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         include:
-          - name: linting
+          - os: ubuntu-18.04
+            name: linting-ubuntu
             python-version: 3.6
-          - name: py36
+
+          - os: ubuntu-18.04
+            name: py36-ubuntu
             python-version: 3.6
-          - name: py37
+
+          - os: windows-latest
+            name: py36-windows
+            python-version: 3.6
+
+          - os: macOS-latest
+            name: py36-mac
+            python-version: 3.6
+
+          - os: ubuntu-18.04
+            name: py37-ubuntu
             python-version: 3.7
-          - name: py38
+
+          - os: windows-latest
+            name: py37-windows
+            python-version: 3.7
+
+          - os: macOS-latest
+            name: py37-mac
+            python-version: 3.7
+
+          - os: ubuntu-18.04
+            name: py38-ubuntu
             python-version: 3.8
-          - name: py39
+
+          - os: windows-latest
+            name: py38-windows
+            python-version: 3.8
+
+          - os: macOS-latest
+            name: py38-mac
+            python-version: 3.8
+
+          - os: ubuntu-18.04
+            name: py39-ubuntu
             python-version: 3.9
-          - name: devel
-            python-version: 3.8
-          - name: pypy3
+
+          - os: windows-latest
+            name: py39-windows
+            python-version: 3.9
+
+          - os: macOS-latest
+            name: py39-mac
+            python-version: 3.9
+
+          - os: ubuntu-18.04
+            name: pypy3-ubuntu
             python-version: pypy3
+
+          # Disabling due to https://github.com/actions/setup-python/issues/151
+          # - os: windows-latest
+          #   name: pypy3-windows
+          #   python-version: pypy3
+
+          - os: macOS-latest
+            name: pypy3-mac
+            python-version: pypy3
+
+          - os: ubuntu-18.04
+            name: devel-ubuntu
+            python-version: 3.8
+
     steps:
+    - name: Set Newline Behavior
+      run : |
+        git config --global core.autocrlf false
     - uses: actions/checkout@master
     - name: Set up Python
       uses: actions/setup-python@v2
@@ -43,9 +101,15 @@ jobs:
     - name: Install tox
       run: |
         python -m pip install --upgrade tox
+    - name: Get Tox Environment Name From Matrix Name
+      uses: rishabhgupta/split-by@v1
+      id: split-matrix-name
+      with:
+        string: '${{ matrix.name }}'
+        split-by: '-'
     - name: Test with tox
       run: |
-        python -m tox -e ${{ matrix.name }}
+        python -m tox -e ${{ steps.split-matrix-name.outputs._0}}
   build_javascript:
     name: grunt
     runs-on: ubuntu-18.04

testing/test_pytest_html.py

@@ -1,6 +1,7 @@
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import builtins
 import json
 import os
 import random
@@ -12,6 +13,20 @@ import pytest
 
 pytest_plugins = ("pytester",)
 
+if os.name == "nt":
+    # Force a utf-8 encoding on file io (since by default windows does not). See
+    # https://github.com/pytest-dev/pytest-html/issues/336
+    #  If we drop support for Python 3.6 and earlier could use python -X utf8 instead.
+    _real_open = builtins.open
+
+    def _open(file, mode="r", buffering=-1, encoding=None, *args, **kwargs):
+        if mode in ("r", "w") and encoding is None:
+            encoding = "utf-8"
+
+        return _real_open(file, mode, buffering, encoding, *args, **kwargs)
+
+    builtins.open = _open
+
 
 def remove_deprecation_from_recwarn(recwarn):
     # TODO: Temporary hack until they fix