Upgrade to PHP 8.1 (#14)

* Updated PHP requirements to >= 8.0

* Updated Codeception to ^5

* Enabled `SecureSocketCest::sendSMTPMessageOverSecureSocket` since it is functional, but added a stopgap in case SSL is not configured correctly since the actual error message is garbled

* Rewrote the development guidelines

* Removed Travis and added Github Actions

.github/workflows/test.yml

@@ -0,0 +1,34 @@
+name: Codeception tests
+
+on: [push]
+
+jobs:
+  build:
+    name: ${{matrix.operating-system}}, PHP ${{ matrix.php }}
+
+    runs-on: ${{ matrix.operating-system }}
+
+    strategy:
+      matrix:
+        operating-system: [ ubuntu-latest, ubuntu-20.04 ]
+        php: [ '8.0', '8.1' ]
+
+    steps:
+      - uses: actions/checkout@master
+
+      - name: Setup PHP
+        uses: nanasess/setup-php@master
+        with:
+          php-version: ${{ matrix.php }}
+
+      - name: Install dependencies
+        run: composer install
+
+      - name: Start smtp-sink
+        run: |
+          sudo apt-get update -qq
+          sudo apt-get install -y -qq postfix
+          smtp-sink -d "%d.%H.%M.%S" localhost:2500 1000 &
+
+      - name: Run tests
+        run: php vendor/bin/codecept run

.gitignore

@@ -4,4 +4,5 @@
 /tests/_output
 /tests/_support/_generated
 /tests/*.suite.yml
-/codeception.yml
+!/tests/unit.suite.yml
+composer.lock

.travis.yml

@@ -1,9 +1,8 @@
 language: php
 
 php:
-  - 7.1
-  - 7.2
-  - 7.3
+  - 8.0
+  - 8.1
 
 before_script:
   - 'composer update --prefer-source'
@@ -13,8 +12,4 @@ before_install:
   - sudo apt-get install -y -qq postfix
   - smtp-sink -d "%d.%H.%M.%S" localhost:2500 1000 &
 
-script: if [ $(phpenv version-name) = "7.0" ]; then vendor/bin/codecept run --coverage-xml; else vendor/bin/codecept run; fi
-
-after_script:
-  - if [ $(phpenv version-name) = "7.0" ]; then wget https://scrutinizer-ci.com/ocular.phar; fi
-  - if [ $(phpenv version-name) = "7.0" ]; then php ocular.phar code-coverage:upload --format=php-clover tests/_output/coverage.xml; fi
+script: vendor/bin/codecept run

README.md

@@ -1,7 +1,7 @@
 kodus/mail
 ==========
 
-[![PHP Version](https://img.shields.io/badge/php-7.1%2B-blue.svg)](https://packagist.org/packages/kodus/mail)
+[![PHP Version](https://img.shields.io/badge/php-8.0%2B-blue.svg)](https://packagist.org/packages/kodus/mail)
 [![Build Status](https://travis-ci.org/kodus/mail.svg?branch=master)](https://travis-ci.org/kodus/mail)
 [![Code Coverage](https://scrutinizer-ci.com/g/kodus/mail/badges/coverage.png?b=master)](https://scrutinizer-ci.com/g/kodus/mail/?branch=master)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/kodus/mail/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/kodus/mail/?branch=master)
@@ -119,15 +119,17 @@ a fake mail-service for testing and development, enabling you to see Messages th
 
 To run the integration tests, you will need to set up a local SMTP server for testing.
 
-On Windows, try [Papercut](https://papercut.codeplex.com/) or [SMTP4Dev](http://smtp4dev.codeplex.com/).
+To make sure `SecureSocketCest` passes your SMTP server also needs to have TLS support with a SSL certificate.
 
-On Linux, you will likely just have to set up an actual, local SMTP daemon. (see `.travis.yml` for an
-example of installing and starting `smtp-sink` which comes with `postfix`.)
+It is recommended to use [smtp4dev](https://github.com/rnwood/smtp4dev) since it has cross-platform support and can generate its own self-signed SSL certificate.
+
+When configuring smtp4dev make sure to set `TlsMode` to `StartTls`, this ensures that TLS is only used when the client asks for it, setting it to `ImplicitTls` will likely make all non-TLS tests fail.
+
+When starting the smtp4dev server it should tell you where the generated certificate is stored, you'll need to add this to your systems trusted CA store.
 
 You may need to copy `integration.suite.dist.yml` to `integration.suite.yml` to customize the
 SMTP host-name, port-number, etc.
 
-
 <a name="objectives"></a>
 ## Objectives
 

codeception.dist.yml → codeception.yml

@@ -5,13 +5,11 @@ coverage:
         - src/*
 paths:
     tests: tests
-    log: tests/_output
+    output: tests/_output
     data: tests/_data
     support: tests/_support
     envs: tests/_envs
 settings:
-    bootstrap: _bootstrap.php
-    colors: false
     memory_limit: 1024M
 extensions:
     enabled:

composer.json

@@ -12,11 +12,12 @@
     "minimum-stability": "dev",
     "prefer-stable": true,
     "require": {
-        "php": ">= 7.1",
+        "php": ">= 8.0",
         "psr/log": "^1"
     },
     "require-dev": {
-        "codeception/codeception": "^2"
+        "codeception/codeception": "^5",
+        "codeception/module-asserts": "^3.0"
     },
     "autoload": {
         "psr-4": {