Fixed PHPStan issue.

composer.json

@@ -20,6 +20,10 @@
 	"autoload": {
 		"classmap": ["src/"]
 	},
+    "scripts": {
+        "analyse": "phpstan analyse --memory-limit=512M",
+        "test": "phpunit"
+    },
     "require-dev": {
         "phpunit/phpunit": "^10.5",
         "phpstan/phpstan": "^1.10"

phpstan.neon

@@ -0,0 +1,4 @@
+parameters:
+    level: 5
+    paths:
+        - src

src/cssdoc.php

@@ -3,6 +3,10 @@
 namespace hexydec\css;
 use \hexydec\tokens\tokenise;
 
+/**
+ * @property-read array<mixed> $config The object configuration array
+ * @property-read int $length The number of children in the document
+ */
 class cssdoc extends config implements \ArrayAccess, \Iterator {
 
 	/**

tests/findcssdocTest.php

@@ -0,0 +1,37 @@
+<?php
+use hexydec\css\cssdoc;
+
+final class findCssdocTest extends \PHPUnit\Framework\TestCase {
+
+	public function testCanFindRules() {
+		$css = '
+			#id {
+				display: block;
+				background: green;
+				color: white;
+			}
+			input[type=submit].form__control-submit {
+				border: 1px solid red;
+				padding: 10px;
+			}
+		';
+		$tests = [
+			[
+				'find' => '#id',
+				'props' => [],
+				'exact' => true,
+				'output' => '#id {
+					display: block;
+					background: green;
+					color: white;
+				}'
+			]
+		];
+		$obj = new cssdoc();
+		$obj->load($css);
+		foreach ($tests AS $item) {
+			$doc = $obj->find($item['find'], $item['props'], [], $item['exact']);
+			$this->assertEquals($item['output'], $doc->compile());
+		}
+	}
+}