From 5d81cf0d4c3aa2ad67a0933b8f6a2c4623468d1e Mon Sep 17 00:00:00 2001
From: Maurizio <hello@lemaur.me>
Date: Thu, 17 Aug 2023 20:51:14 +0200
Subject: [PATCH] feat: add `toHaveCamelCaseKeys`

---
 src/Expectation.php                           | 22 +++++++++++++
 tests/Features/Expect/toHaveCamelCaseKeys.php | 31 +++++++++++++++++++
 2 files changed, 53 insertions(+)
 create mode 100644 tests/Features/Expect/toHaveCamelCaseKeys.php

diff --git a/src/Expectation.php b/src/Expectation.php
index c5f4c411..df725059 100644
--- a/src/Expectation.php
+++ b/src/Expectation.php
@@ -784,4 +784,26 @@ final class Expectation
 
         return $this;
     }
+
+    /**
+     * Asserts that the given expectation is iterable and contains camelCase keys.
+     *
+     * @return self<TValue>
+     */
+    public function toHaveCamelCaseKeys(string $message = ''): self
+    {
+        if (! is_iterable($this->value)) {
+            InvalidExpectationValue::expected('iterable');
+        }
+
+        foreach ($this->value as $k => $item) {
+            $this->and($k)->toBeCamelCase($message);
+
+            if (is_array($item)) {
+                $this->and($item)->toHaveCamelCaseKeys($message);
+            }
+        }
+
+        return $this;
+    }
 }
diff --git a/tests/Features/Expect/toHaveCamelCaseKeys.php b/tests/Features/Expect/toHaveCamelCaseKeys.php
new file mode 100644
index 00000000..4fc73428
--- /dev/null
+++ b/tests/Features/Expect/toHaveCamelCaseKeys.php
@@ -0,0 +1,31 @@
+<?php
+
+use Pest\Exceptions\InvalidExpectationValue;
+use PHPUnit\Framework\ExpectationFailedException;
+
+$array = [
+    'camel' => true,
+    'camelCase' => [
+        'camel' => true,
+        'camelCase' => [
+            'camel' => true,
+            'camelCase' => true,
+        ],
+    ],
+];
+
+test('pass', function () use ($array) {
+    expect($array)->toHaveCamelCaseKeys();
+});
+
+test('failures', function () {
+    expect('not-an-array')->toHaveCamelCaseKeys();
+})->throws(InvalidExpectationValue::class);
+
+test('failures with message', function () use ($array) {
+    expect($array)->not->toHaveCamelCaseKeys('oh no!');
+})->throws(ExpectationFailedException::class, 'oh no!');
+
+test('not failures', function () use ($array) {
+    expect($array)->not->toHaveCamelCaseKeys();
+})->throws(ExpectationFailedException::class);