Add PHP 8.0 tests (#186)

Author: mmoll

.travis.yml

@@ -7,6 +7,7 @@ php:
     - 7.2 # security support until 30/11/2020
     - 7.3 # security support until 06/12/2021
     - 7.4 # security support until 28/11/2022
+    - 8.0 # security support until 26/11/2023
     - nightly
 
 addons:
@@ -17,6 +18,13 @@ addons:
 before_script:
   - stable='^[0-9\.]+$'; if [[ "$TRAVIS_PHP_VERSION" =~ $stable ]]; then phpenv config-rm xdebug.ini; fi
   - export PATH="$HOME/.composer/vendor/bin:$PATH"
+  # PHPUnit 8.x is not (yet) supported, so prevent issues with Travis images using it.
+  - |
+    if [[ $TRAVIS_PHP_VERSION == "nightly" || $TRAVIS_PHP_VERSION == "8.0" ]]; then
+      travis_retry composer install --ignore-platform-reqs
+    else
+      travis_retry composer install
+    fi
 
 script:
     - ant test -Dcomposer.path=composer

build.properties

@@ -4,4 +4,3 @@ composer.path = ${basedir}/composer.phar
 
 #PHP Code Sniffer
 phpcs.standard = PEAR
-phpcs.dir = ${basedir}/vendor/squizlabs/php_codesniffer

build.xml

@@ -17,7 +17,7 @@
         <delete dir="${basedir}/build" />
     </target>
 
-    <target name="vendor" description="Load composer repositories" depends="composer">
+    <target name="vendor" description="Load composer repositories" depends="composer" unless="${env.TRAVIS}">
         <exec executable="${composer.path}" failonerror="true">
             <arg value="install" />
         </exec>