scafolding for MessageID validation

src/Validation/MessageIDValidation.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Egulias\EmailValidator\Validation;
+
+use Egulias\EmailValidator\EmailLexer;
+use Egulias\EmailValidator\Result\InvalidEmail;
+
+class MessageIDValidation implements EmailValidation
+{
+    public function isValid(string $email, EmailLexer $emailLexer): bool
+    {
+        return true;
+    }
+
+    public function getWarnings(): array
+    {
+        return [];
+    }
+
+    public function getError(): ?InvalidEmail
+    {
+        return null;
+    }
+}

tests/EmailValidator/Validation/MessageIDValidationTest.php

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+<?php
+
+namespace Egulias\EmailValidator\Tests\EmailValidator\Validation;
+
+use Egulias\EmailValidator\EmailLexer;
+use Egulias\EmailValidator\Validation\MessageIDValidation;
+use PHPUnit\Framework\TestCase;
+
+class MessageIDValidationTest extends TestCase
+{
+
+    /**
+     * @dataProvider validMessageIDs
+     */
+    public function testValidMessageIDs(string $messageID)
+    {
+        $validator = new MessageIDValidation();
+
+        $this->assertTrue($validator->isValid($messageID, new EmailLexer()));
+    }
+
+    public function validMessageIDs() : array
+    {
+        return [
+            ['a@b.c+&%$.d'],
+            ['a.b+&%$.c@d'],
+            ['a@ä'],
+        ];
+    }
+
+    /**
+     * @dataProvider invalidMessageIDs
+     */
+    public function testInvalidMessageIDs(string $messageID)
+    {
+        $validator = new MessageIDValidation();
+
+        $this->assertFalse($validator->isValid($messageID, new EmailLexer()));
+    }
+
+    public function invalidMessageIDs() : array
+    {
+        return [
+            ['example'],
+        ];
+    }
+}