Fixed tests on HHVM (#70)

Author: GrahamCampbell

.gitattributes

@@ -3,7 +3,6 @@
 /.gitignore export-ignore
 /.gitattributes export-ignore
 /.github export-ignore
-/.travis.yml export-ignore
 /Makefile export-ignore
 /phpunit.xml.dist export-ignore
 /tests export-ignore

.github/bin/composer.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+EXPECTED_CHECKSUM="$(wget -q -O - https://composer.github.io/installer.sig)"
+php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
+ACTUAL_CHECKSUM="$(php -r "echo hash_file('sha384', 'composer-setup.php');")"
+if [ "$EXPECTED_CHECKSUM" != "$ACTUAL_CHECKSUM" ]; then
+  >&2 echo 'ERROR: Invalid installer checksum'
+  rm composer-setup.php
+  exit 1
+else
+  php composer-setup.php --install-dir="/usr/bin" --filename=composer
+  RESULT=$?
+  rm composer-setup.php
+  composer config platform.php 5.6.50
+  exit $RESULT
+fi

.github/bin/hhvm.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+echo "deb https://dl.hhvm.com/ubuntu $(lsb_release -sc)-lts-$1 main" >> /etc/apt/sources.list
+apt-get update
+apt-get --allow-downgrades --reinstall install hhvm/$(lsb_release -sc)-lts-$1

.github/workflows/tests.yml

@@ -91,3 +91,33 @@ jobs:
 
       - name: Execute PHPUnit
         run: vendor\bin\phpunit.bat
+
+  test_hhvm:
+    name: HHVM ${{ matrix.hhvm }}
+    runs-on: ubuntu-16.04
+
+    strategy:
+      matrix:
+        hhvm: ["3.15", "3.18", "3.21", "3.24"]
+
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v2
+
+      - name: Install HHVM
+        shell: bash
+        run: sudo .github/bin/hhvm.sh ${{ matrix.hhvm }}
+
+      - name: Install Composer
+        shell: bash
+        run: sudo .github/bin/composer.sh
+
+      - name: Install Dependencies
+        uses: nick-invision/retry@v1
+        with:
+          timeout_minutes: 5
+          max_attempts: 5
+          command: composer update --no-interaction --no-progress
+
+      - name: Execute PHPUnit
+        run: hhvm vendor/bin/phpunit