Add dummy ParserFactory test

:/

lib/PhpParser/ParserFactory.php

@@ -9,11 +9,17 @@ class ParserFactory {
     const ONLY_PHP5 = 4;
 
     /**
-     * @param int $kind
-     * @return Parser
+     * Creates a Parser instance, according to the provided kind.
+     *
+     * @param int        $kind  One of ::PREFER_PHP7, ::PREFER_PHP5, ::ONLY_PHP7 or ::ONLY_PHP5
+     * @param Lexer|null $lexer Lexer to use. Defaults to emulative lexer when not specified
+     *
+     * @return Parser The parser instance
      */
-    public function create($kind) {
-        $lexer = new Lexer\Emulative();
+    public function create($kind, Lexer $lexer = null) {
+        if (null === $lexer) {
+            $lexer = new Lexer\Emulative();
+        }
         switch ($kind) {
             case self::PREFER_PHP7:
                 return new Parser\Multiple([

test/PhpParser/ParserFactoryTest.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace PhpParser;
+
+/* This test is very weak, because PHPUnit's assertEquals assertion is way too slow dealing with the
+ * large objects involved here. So we just do some basic instanceof tests instead. */
+class ParserFactoryTest extends \PHPUnit_Framework_TestCase {
+    /** @dataProvider provideTestCreate */
+    public function testCreate($kind, $lexer, $expected) {
+        $this->assertInstanceOf($expected, (new ParserFactory)->create($kind, $lexer));
+    }
+
+    public function provideTestCreate() {
+        $lexer = new Lexer();
+        return [
+            [
+                ParserFactory::PREFER_PHP7, $lexer,
+                'PhpParser\Parser\Multiple'
+            ],
+            [
+                ParserFactory::PREFER_PHP5, null,
+                'PhpParser\Parser\Multiple'
+            ],
+            [
+                ParserFactory::ONLY_PHP7, null,
+                'PhpParser\Parser\Php7'
+            ],
+            [
+                ParserFactory::ONLY_PHP5, $lexer,
+                'PhpParser\Parser\Php5'
+            ]
+        ];
+    }
+}