[TASK] Add unit tests for Selector.selector (#1036)

Part of #757

Author: oliverklee

tests/Unit/Property/SelectorTest.php

@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabberworm\CSS\Tests\Unit\Property;
+
+use PHPUnit\Framework\TestCase;
+use Sabberworm\CSS\Property\Selector;
+
+/**
+ * @covers \Sabberworm\CSS\Property\Selector
+ */
+final class SelectorTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function getSelectorByDefaultReturnsSelectorProvidedToConstructor(): void
+    {
+        $selector = 'a';
+        $subject = new Selector($selector);
+
+        self::assertSame($selector, $subject->getSelector());
+    }
+
+    /**
+     * @test
+     */
+    public function setSelectorOverwritesSelectorProvidedToConstructor(): void
+    {
+        $subject = new Selector('a');
+
+        $selector = 'input';
+        $subject->setSelector($selector);
+
+        self::assertSame($selector, $subject->getSelector());
+    }
+}