Added PHPUnit test for sorting; I could not get the rows in the right...

order without calling array_values - maybe this helps just PHPUnit. I
consider the risk of breaking library users' code unlikely.

tests/properties/BaseClass.php

@@ -0,0 +1,31 @@
+<?php
+
+class BaseClass extends PHPUnit\Framework\TestCase {
+
+    /**
+     * CSV
+     * The parseCSV object
+     *
+     * @access protected
+     * @var parseCSV
+     */
+    protected $csv;
+
+    /**
+     * Setup
+     * Setup our test environment objects
+     *
+     * @access public
+     */
+    public function setUp() {
+        $this->csv = new parseCSV();
+    }
+
+    protected function _compareWithExpected($expected) {
+        $this->csv->auto(__DIR__ . '/../../examples/_books.csv');
+        $actual = array_map(function ($row) {
+            return $row['title'];
+        }, $this->csv->data);
+        $this->assertEquals($expected, $actual);
+    }
+}