feat: validation expectations (#1762)

* feat: add validation expectations for IP, MAC, hostname, domain, base64, and hexadecimal

* improvements

* improvements

tests/Features/Expect/toBeHexadecimal.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+use Pest\Exceptions\InvalidExpectationValue;
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function (): void {
+    expect('abcdef')->toBeHexadecimal() // lowercase
+        ->and('ABCDEF')->toBeHexadecimal() // uppercase
+        ->and('aBcDeF')->toBeHexadecimal() // mixed case
+        ->and('1234567890')->toBeHexadecimal() // numeric
+        ->and('deadbeef')->toBeHexadecimal(); // alphanumeric
+});
+
+test('failures', function (): void {
+    expect('xyz')->toBeHexadecimal();
+})->throws(ExpectationFailedException::class);
+
+test('failures with invalid characters', function (): void {
+    expect('ghijkl')->toBeHexadecimal();
+})->throws(ExpectationFailedException::class);
+
+test('failures with zero-x prefix', function (): void {
+    expect('0x1a')->toBeHexadecimal();
+})->throws(ExpectationFailedException::class);
+
+test('failures with empty string', function (): void {
+    expect('')->toBeHexadecimal();
+})->throws(ExpectationFailedException::class);
+
+test('failures with invalid type', function (): void {
+    expect([])->toBeHexadecimal();
+})->throws(InvalidExpectationValue::class, 'Invalid expectation value type. Expected [string].');
+
+test('failures with custom message', function (): void {
+    expect('xyz')->toBeHexadecimal('oh no!');
+})->throws(ExpectationFailedException::class, 'oh no!');
+
+test('not failures', function (): void {
+    expect('abcdef')->not->toBeHexadecimal();
+})->throws(ExpectationFailedException::class);