add to be url expectation

tests/Features/Expect/toBeUrl.php

@@ -0,0 +1,24 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect('https://pestphp.com')->toBeUrl()
+        ->and('pestphp.com')->not->toBeUrl();
+});
+
+test('failures', function () {
+    expect('pestphp.com')->toBeUrl();
+})->throws(ExpectationFailedException::class);
+
+test('failures with custom message', function () {
+    expect('pestphp.com')->toBeUrl('oh no!');
+})->throws(ExpectationFailedException::class, 'oh no!');
+
+test('failures with default message', function () {
+    expect('pestphp.com')->toBeUrl();
+})->throws(ExpectationFailedException::class, 'Failed asserting that pestphp.com is a url.');
+
+test('not failures', function () {
+    expect('https://pestphp.com')->not->toBeUrl();
+})->throws(ExpectationFailedException::class);