scan only php files

composer.json

@@ -23,6 +23,7 @@
             "Faissaloux\\PestInside\\": "src/"
         },
         "files": [
+            "src/helpers.php",
             "src/Autoload.php"
         ]
     },

src/Expectation.php

@@ -14,6 +14,7 @@ function (): PestExpectation {
 
             if ($files = scandir($files[0])) {
                 $files = array_diff($files, ['.', '..']);
+                $files = array_filter($files, 'isPhp');
                 $files = array_map(fn (string $file): string => $directory.DIRECTORY_SEPARATOR.$file, $files);
             }
 

src/helpers.php

@@ -0,0 +1,8 @@
+<?php
+
+function isPhp(string $file): bool
+{
+    $exploded = explode(".", $file);
+
+    return end($exploded) === "php";
+}