Test file uploads properly

composer.json

@@ -22,7 +22,7 @@
         "php": ">=8.1",
         "ext-json": "*",
         "behat/mink": "^1.11@dev",
-        "lullabot/php-webdriver": "^2.0.5"
+        "lullabot/php-webdriver": "^2.0.6"
     },
     "require-dev": {
         "mink/driver-testsuite": "dev-master",

tests/Custom/RemoteFileUploadTest.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace Behat\Mink\Tests\Driver\Custom;
+
+use Behat\Mink\Tests\Driver\TestCase;
+use Composer\InstalledVersions;
+
+class RemoteFileUploadTest extends TestCase
+{
+    public function testRemoteFileUpload(): void
+    {
+        $this->getSession()->visit($this->pathTo('/advanced_form.html'));
+
+        $webAssert = $this->getAssertSession();
+        $page = $this->getSession()->getPage();
+
+        $about = $webAssert->fieldExists('about');
+        // Place a file outside of the directories mapped to the selenium
+        // server.
+        $path = sys_get_temp_dir() . '/some_file.txt';
+        copy(InstalledVersions::getInstallPath('mink/driver-testsuite') . '/web-fixtures/some_file.txt', $path);
+        $about->attachFile($path);
+        unlink(sys_get_temp_dir() . '/some_file.txt');
+
+        $button = $page->findButton('Register');
+        $this->assertNotNull($button);
+        $button->press();
+
+        if ($this->safePageWait(5000, 'document.title === "Advanced form save"')) {
+            $out = <<<'OUT'
+some_file.txt
+1 uploaded file
+OUT;
+            $this->assertStringContainsString($out, $page->getContent());
+        }
+        else {
+            $this->fail('Failed to submit form');
+        }
+    }
+
+    protected function tearDown(): void
+    {
+        if (file_exists(sys_get_temp_dir() . '/some_file.txt')) {
+            unlink(sys_get_temp_dir() . '/some_file.txt');
+        }
+    }
+
+}