[TASK] Add trait for getArrayRepresentation to populate class (#1451)

Part of #1440.

Author: JakeQZ

src/ShortClassNameProvider.php

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabberworm\CSS;
+
+/**
+ * Provides a method to obtain the short name of the instantiated class (i.e. without namespace prefix).
+ *
+ * @internal
+ */
+trait ShortClassNameProvider
+{
+    /**
+     * @return non-empty-string
+     */
+    private function getShortClassName(): string
+    {
+        return (new \ReflectionClass($this))->getShortName();
+    }
+}

tests/Unit/Fixtures/ConcreteShortClassNameProvider.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Sabberworm\CSS\Tests\Unit\Fixtures;
+
+use Sabberworm\CSS\ShortClassNameProvider;
+
+final class ConcreteShortClassNameProvider
+{
+    use ShortClassNameProvider;
+
+    /**
+     * Public wrapper for private method to allow testing.
+     *
+     * @return non-empty-string
+     */
+    public function getTheShortClassName(): string
+    {
+        return $this->getShortClassName();
+    }
+}

tests/Unit/ShortClassNameProviderTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Sabberworm\CSS\Tests\Unit;
+
+use PHPUnit\Framework\TestCase;
+use Sabberworm\CSS\Tests\Unit\Fixtures\ConcreteShortClassNameProvider;
+
+/**
+ * @covers \Sabberworm\CSS\ShortClassNameProvider
+ */
+final class ShortClassNameProviderTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function getArrayRepresentationIncludesClassName(): void
+    {
+        $subject = new ConcreteShortClassNameProvider();
+
+        $result = $subject->getTheShortClassName();
+
+        self::assertSame('ConcreteShortClassNameProvider', $result);
+    }
+}