feat: validation expectations (#1762)

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

* improvements

* improvements

tests/Features/Expect/toBeBase64.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+use Pest\Exceptions\InvalidExpectationValue;
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function (): void {
+    expect('Zm9v')->toBeBase64() // 'foo' (no padding)
+        ->and('Zm9vYg==')->toBeBase64() // 'foob' (with padding)
+        ->and('Zm9vYmE=')->toBeBase64() // 'fooba' (with padding)
+        ->and('Zm9vYmFy')->toBeBase64() // 'foobar' (no padding)
+        ->and('')->toBeBase64(); // empty string
+});
+
+test('failures', function (): void {
+    expect('not-base64!')->toBeBase64();
+})->throws(ExpectationFailedException::class);
+
+test('failures with invalid padding', function (): void {
+    expect('AAA')->toBeBase64();
+})->throws(ExpectationFailedException::class);
+
+test('failures with padding only', function (): void {
+    expect('====')->toBeBase64();
+})->throws(ExpectationFailedException::class);
+
+test('failures with malformed input', function (): void {
+    expect('!!invalid!!')->toBeBase64();
+})->throws(ExpectationFailedException::class);
+
+test('failures with invalid type', function (): void {
+    expect([])->toBeBase64();
+})->throws(InvalidExpectationValue::class, 'Invalid expectation value type. Expected [string].');
+
+test('failures with custom message', function (): void {
+    expect('!!invalid!!')->toBeBase64('oh no!');
+})->throws(ExpectationFailedException::class, 'oh no!');
+
+test('not failures', function (): void {
+    expect('Zm9v')->not->toBeBase64();
+})->throws(ExpectationFailedException::class);