N°2651 rollback gitignore for lib tests dirs

Too dangerous ! We'll work properly on this but for 2.8

lib/nikic/php-parser/test/PhpParser/Parser/Php7Test.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace PhpParser\Parser;
+
+use PhpParser\Lexer;
+use PhpParser\ParserTest;
+
+require_once __DIR__ . '/../ParserTest.php';
+
+class Php7Test extends ParserTest {
+    protected function getParser(Lexer $lexer) {
+        return new Php7($lexer);
+    }
+}