Tests update.

- Add testing for PHP8.
- Add guard against testing outside of Composer.

Author: Maikuolan

.github/workflows/core.yml

@@ -9,7 +9,7 @@ jobs:
   strategy:
    matrix:
     operating-system: [ubuntu-latest]
-    php-versions: ['7.2', '7.3', '7.4']
+    php-versions: ['7.2', '7.3', '7.4', '8.0']
   name: PHP ${{ matrix.php-versions }} on ${{ matrix.operating-system }}
   steps:
   - name: Checkout

tests.php

@@ -1,4 +1,11 @@
 <?php
+// Prevent running tests outside of Composer (if the package is deployed
+// somewhere live with this file still intact, useful to prevent hammering and
+// cycles being needlessly wasted).
+if (!isset($_SERVER['COMPOSER_BINARY'])) {
+    die;
+}
+
 // Suppress unexpected errors from output and exit early as a failure when encountered.
 set_error_handler(function ($errno, $errstr, $errfile, $errline) {
     exit(1);