feat: add toHaveStudlyCaseKeys

src/Expectation.php

@@ -806,4 +806,26 @@ final class Expectation
 
         return $this;
     }
+
+    /**
+     * Asserts that the given expectation is iterable and contains StudlyCase keys.
+     *
+     * @return self<TValue>
+     */
+    public function toHaveStudlyCaseKeys(string $message = ''): self
+    {
+        if (! is_iterable($this->value)) {
+            InvalidExpectationValue::expected('iterable');
+        }
+
+        foreach ($this->value as $k => $item) {
+            $this->and($k)->toBeStudlyCase($message);
+
+            if (is_array($item)) {
+                $this->and($item)->toHaveStudlyCaseKeys($message);
+            }
+        }
+
+        return $this;
+    }
 }

tests/Features/Expect/toHaveStudlyCaseKeys.php

@@ -0,0 +1,31 @@
+<?php
+
+use Pest\Exceptions\InvalidExpectationValue;
+use PHPUnit\Framework\ExpectationFailedException;
+
+$array = [
+    'Studly' => true,
+    'StudlyCase' => [
+        'Studly' => true,
+        'StudlyCase' => [
+            'Studly' => true,
+            'StudlyCase' => true,
+        ],
+    ],
+];
+
+test('pass', function () use ($array) {
+    expect($array)->toHaveStudlyCaseKeys();
+});
+
+test('failures', function () {
+    expect('not-an-array')->toHaveStudlyCaseKeys();
+})->throws(InvalidExpectationValue::class);
+
+test('failures with message', function () use ($array) {
+    expect($array)->not->toHaveStudlyCaseKeys('oh no!');
+})->throws(ExpectationFailedException::class, 'oh no!');
+
+test('not failures', function () use ($array) {
+    expect($array)->not->toHaveStudlyCaseKeys();
+})->throws(ExpectationFailedException::class);