Reimplements the new toHaveArray features.

src/Expectation.php

@@ -6,8 +6,10 @@ namespace Pest;
 
 use BadMethodCallException;
 use Pest\Concerns\Extendable;
+use Pest\Support\Arr;
 use PHPUnit\Framework\Assert;
 use PHPUnit\Framework\Constraint\Constraint;
+use PHPUnit\Framework\ExpectationFailedException;
 use SebastianBergmann\Exporter\Exporter;
 
 /**
@@ -522,10 +524,16 @@ final class Expectation
             $array = (array) $this->value;
         }
 
-        Assert::assertArrayHasKey($key, $array);
+        try {
+            Assert::assertTrue(Arr::has($array, $key));
+
+            /* @phpstan-ignore-next-line  */
+        } catch (ExpectationFailedException $exception) {
+            throw new ExpectationFailedException("Failed asserting that an array has the key '$key'", $exception->getComparisonFailure());
+        }
 
         if (func_num_args() > 1) {
-            Assert::assertEquals($value, $array[$key]);
+            Assert::assertEquals($value, Arr::get($array, $key));
         }
 
         return $this;

src/Support/Arr.php

@@ -0,0 +1,68 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Support;
+
+/**
+ * Credits: most of this class methods and implementations
+ * belongs to the Arr helper of laravel/framework project
+ * (https://github.com/laravel/framework).
+ *
+ * @internal
+ */
+final class Arr
+{
+    /**
+     * @param array<mixed> $array
+     * @param string|int   $key
+     */
+    public static function has(array $array, $key): bool
+    {
+        $key = (string) $key;
+
+        if (array_key_exists($key, $array)) {
+            return true;
+        }
+
+        foreach (explode('.', $key) as $segment) {
+            if (is_array($array) && array_key_exists($segment, $array)) {
+                $array = $array[$segment];
+            } else {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * @param array<mixed> $array
+     * @param string|int   $key
+     * @param null         $default
+     *
+     * @return array|mixed|null
+     */
+    public static function get(array $array, $key, $default = null)
+    {
+        $key = (string) $key;
+
+        if (array_key_exists($key, $array)) {
+            return $array[$key];
+        }
+
+        if (strpos($key, '.') === false) {
+            return $array[$key] ?? $default;
+        }
+
+        foreach (explode('.', $key) as $segment) {
+            if (is_array($array) && array_key_exists($segment, $array)) {
+                $array = $array[$segment];
+            } else {
+                return $default;
+            }
+        }
+
+        return $array;
+    }
+}