Migrate tests to phpunit > 6

Author: mikehaertl

phpunit.xml.dist

@@ -9,7 +9,7 @@
          processIsolation="false"
          stopOnFailure="false"
          syntaxCheck="false"
-         bootstrap="vendor/autoload.php"
+         bootstrap="./tests/bootstrap.php"
 >
     <testsuites>
         <testsuite name="PHP tmpfile Test Suite">

tests/FileTest.php

@@ -1,7 +1,7 @@
 <?php
 use mikehaertl\tmp\File;
 
-class FileTest extends \PHPUnit_Framework_TestCase
+class FileTest extends \PHPUnit\Framework\TestCase
 {
     public function testCanCreateFile()
     {

tests/bootstrap.php

@@ -0,0 +1,10 @@
+<?php
+// Some travis environments use phpunit > 6
+$newClass = '\PHPUnit\Framework\TestCase';
+$oldClass = '\PHPUnit_Framework_TestCase';
+if (!class_exists($newClass) && class_exists($oldClass)) {
+    class_alias($oldClass, $newClass);
+}
+
+require __DIR__ . '/../vendor/autoload.php';
+