Update tests

tests/Support/AltchaPayload.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace Tests\Support;
+
+use AltchaOrg\Altcha\Algorithm\Pbkdf2;
+use AltchaOrg\Altcha\Altcha;
+use AltchaOrg\Altcha\CreateChallengeOptions;
+use AltchaOrg\Altcha\SolveChallengeOptions;
+
+/**
+ * Builds a valid altcha payload for tests using the fixed ALTCHA_HMAC_KEY,
+ * mirroring the payload shape produced by the browser widget (base64 JSON with
+ * a challenge array and a solution array).
+ */
+final class AltchaPayload
+{
+    public static function valid(?int $counter = null): string
+    {
+        $pbkdf2 = new Pbkdf2;
+        $altcha = new Altcha(
+            hmacSignatureSecret: config('captcha.hmac_key'),
+        );
+
+        $counter ??= random_int(1, 100);
+
+        $challenge = $altcha->createChallenge(new CreateChallengeOptions(
+            algorithm: $pbkdf2,
+            cost: 5000,
+            counter: $counter,
+            expiresAt: time() + 600,
+        ));
+
+        $solution = $altcha->solveChallenge(new SolveChallengeOptions(
+            challenge: $challenge,
+            algorithm: $pbkdf2,
+            start: $counter,
+            step: 1,
+            timeout: 5,
+        ));
+
+        return base64_encode(json_encode([
+            'challenge' => $challenge->toArray(),
+            'solution' => $solution->toArray(),
+        ]));
+    }
+}