Fix: Replace script with tests

Closes GH-631.

Author: localheinz

include/check_email_func.php

@@ -0,0 +1,53 @@
+--TEST--
+clean_AntiSPAM() removes spam terms
+--FILE--
+<?php
+
+require_once __DIR__ . '/../include/email-validation.inc';
+
+$emails = array (
+    '[email protected]',
+    '[email protected]',
+    '[email protected]',
+    '[email protected]',
+    '[email protected]',
+    '[email protected]',
+    '[email protected]',
+    '[email protected]',
+    '[email protected]',
+    'wrong-address-with@@@@-remove_me-and-some-i-hate_SPAM-stuff',
+    '[email protected]',
+);
+
+$cleanedEmails = array_map(static function (string $email): string {
+    return clean_AntiSPAM($email);
+}, $emails);
+
+var_dump($cleanedEmails);
+
+?>
+--EXPECT--
+array(11) {
+  [0]=>
+  string(21) "[email protected]"
+  [1]=>
+  string(22) "[email protected]"
+  [2]=>
+  string(22) "[email protected]"
+  [3]=>
+  string(22) "[email protected]"
+  [4]=>
+  string(22) "[email protected]"
+  [5]=>
+  string(19) "[email protected]"
+  [6]=>
+  string(23) "[email protected]"
+  [7]=>
+  string(23) "[email protected]"
+  [8]=>
+  string(20) "[email protected]"
+  [9]=>
+  string(35) "wrong-address-with@@@@and-somestuff"
+  [10]=>
+  string(33) "[email protected]"
+}

tests/clean-anti-spam.phpt

@@ -0,0 +1,43 @@
+--TEST--
+is_emailable_address() returns whether email is emailable
+--FILE--
+<?php
+
+require_once __DIR__ . '/../include/email-validation.inc';
+
+$emails = array(
+    '[email protected]',
+    '[email protected]',
+    '[email protected]',
+    '[email protected]',
+    '[email protected]',
+    '[email protected]',
+    '[email protected]',
+    '[email protected]',
+    '[email protected]',
+    'wrong-address-with@@@@-remove_me-and-some-i-hate_SPAM-stuff',
+    '[email protected]',
+);
+
+$emailsThatAreEmailableAddresses = array_filter($emails, static function (string $email): bool {
+    return is_emailable_address($email);
+});
+
+var_dump($emailsThatAreEmailableAddresses);
+
+?>
+--EXPECT--
+array(6) {
+  [0]=>
+  string(21) "[email protected]"
+  [1]=>
+  string(35) "[email protected]"
+  [3]=>
+  string(30) "[email protected]"
+  [5]=>
+  string(19) "[email protected]"
+  [7]=>
+  string(23) "[email protected]"
+  [8]=>
+  string(20) "[email protected]"
+}