Added unit test for stringifying ClassString

Author: othercorey

src/TypeResolver.php

@@ -432,7 +432,7 @@ private function resolveCollection(ArrayIterator $tokens, Type $classType, Conte
         $isArray    = ((string) $classType === 'array');
         $isIterable = ((string) $classType === 'iterable');
 
-        // allow only "array", "iterable", "class-string" or class name before "<"
+        // allow only "array", "iterable" or class name before "<"
         if (!$isArray && !$isIterable
             && (!$classType instanceof Object_ || $classType->getFqsen() === null)) {
             throw new RuntimeException(

tests/unit/Types/ClassStringTest.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of phpDocumentor.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @link      http://phpdoc.org
+ */
+
+namespace phpDocumentor\Reflection\Types;
+
+use phpDocumentor\Reflection\Fqsen;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @coversDefaultClass \phpDocumentor\Reflection\Types\ClassString
+ */
+class ClassStringTest extends TestCase
+{
+    /**
+     * @dataProvider provideClassStrings
+     * @covers ::__toString
+     */
+    public function testClassStringStringifyCorrectly(ClassString $array, string $expectedString) : void
+    {
+        $this->assertSame($expectedString, (string) $array);
+    }
+
+    /**
+     * @return mixed[]
+     */
+    public function provideClassStrings() : array
+    {
+        return [
+            'generic clss string' => [new ClassString(), 'class-string'],
+            'typed class string' => [new ClassString(new Fqsen('\Foo\Bar')), 'class-string<\Foo\Bar>'],
+        ];
+    }
+}