diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 3aa7778..14e6fbe 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -11,25 +11,65 @@
     throw new \RuntimeException('Class loader not found');
 }
 
+if (! \function_exists('recursiveDirectoryRegexIterator')) {
+    function recursiveDirectoryRegexIterator(string $path, string $regex): \Generator
+    {
+        $flags = \FilesystemIterator::FOLLOW_SYMLINKS | \FilesystemIterator::SKIP_DOTS;
+
+        $recursiveDirectoryIterator = new \RecursiveDirectoryIterator($path, $flags);
+
+        $recursiveIteratorIterator = new \RecursiveIteratorIterator($recursiveDirectoryIterator);
+
+        yield from new \RegexIterator($recursiveIteratorIterator, $regex);
+    }
+}
+
+\error_reporting(\E_ALL);
+
 \ini_set('memory_limit', '-1');
 
-$path = __DIR__ . \DIRECTORY_SEPARATOR . 'Fixture';
-if (! \is_dir($path)) {
-    return $classLoader;
+$autoloadPath = \implode(\DIRECTORY_SEPARATOR, [__DIR__, 'Fixture', 'Autoload']);
+if (\is_dir($autoloadPath)) {
+    // load the Fixture files in the "Autoload" directory
+    foreach (\recursiveDirectoryRegexIterator($autoloadPath, '#^.+\.php$#iu') as $file) {
+        require_once $file->getPathname();
+    }
 }
 
-$iterator = new \RegexIterator(
-    new \RecursiveIteratorIterator(
-        new \RecursiveDirectoryIterator(
-            $path,
-            \FilesystemIterator::FOLLOW_SYMLINKS | \FilesystemIterator::SKIP_DOTS
-        )
-    ),
-    '#^.+\.php$#iu'
-);
-
-foreach ($iterator as $file) {
-    require_once $file->getPathname();
+$currentPHPVersion = (\PHP_MAJOR_VERSION * 10) + \PHP_MINOR_VERSION;
+$phpVersions = [54, 55, 56, 70, 71, 72, 73, 74, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90];
+
+foreach ($phpVersions as $versionChecked) {
+    if ($currentPHPVersion < $versionChecked) {
+        // if the current PHP version is less than the version being checked, skip it
+        continue;
+    }
+
+    if ($currentPHPVersion === $versionChecked) {
+        $phpVersionOnlyPath = \implode(\DIRECTORY_SEPARATOR, [
+            __DIR__,
+            'Fixture',
+            \sprintf('PHP%dOnly', $versionChecked)
+        ]);
+        if (\is_dir($phpVersionOnlyPath)) {
+            // load the Fixture files in the "PHP{version}Only" directory
+            foreach (\recursiveDirectoryRegexIterator($phpVersionOnlyPath, '#^.+\.php$#iu') as $file) {
+                require_once $file->getPathname();
+            }
+        }
+    }
+
+    $phpVersionPath = \implode(\DIRECTORY_SEPARATOR, [
+        __DIR__,
+        'Fixture',
+        \sprintf('PHP%d', $versionChecked)
+    ]);
+    if (\is_dir($phpVersionPath)) {
+        // load the Fixture files in the "PHP{version}" directory
+        foreach (\recursiveDirectoryRegexIterator($phpVersionPath, '#^.+\.php$#iu') as $file) {
+            require_once $file->getPathname();
+        }
+    }
 }
 
 return $classLoader;