Don't break people's code just because they don't have Composer

tests/methods/OldRequireTest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace ParseCsv\tests\methods;
+
+use PHPUnit\Framework\TestCase;
+
+class OldRequireTest extends TestCase {
+
+    protected function setUp() {
+        rename('vendor/autoload.php', '__autoload');
+    }
+
+    protected function tearDown() {
+        rename('__autoload', 'vendor/autoload.php');
+    }
+
+    /**
+     * @runInSeparateProcess because download.php uses header()
+     */
+    public function testOldLibWithoutComposer() {
+
+        file_put_contents('__eval.php', '<?php require "parsecsv.lib.php"; new \ParseCsv\Csv;');
+        exec("php __eval.php", $output, $return_var);
+        unlink('__eval.php');
+        $this->assertEquals($output, []);
+        $this->assertEquals(0, $return_var);
+    }
+}