Improve DateTime transformer, Add microtime support on Sleep transformer

Author: camillebaronnet

src/Tests/Transformer/DateTimeTest.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace Camillebaronnet\ETL\Tests\Transformer;
+
+use Camillebaronnet\ETL\Transformer\DateTime;
+use PHPUnit\Framework\TestCase;
+
+final class DateTimeTest extends TestCase
+{
+    /**
+     * @var DateTime
+     */
+    private $dateTime;
+
+    /**
+     * @var array
+     */
+    private $data = [
+        'name' => 'Bar',
+        'created_at' => '20/06/1990 12h15',
+        'updated_at' => '21/06/2010 6h02',
+    ];
+
+
+    protected function setUp()
+    {
+        $this->dateTime = new DateTime();
+    }
+
+    public function testCanReformatTheDatesBySpecifyingInputFormatAndOutputFormat()
+    {
+        $this->dateTime->from = 'd/m/Y H\hi';
+        $this->dateTime->to = 'Y-m-d H:i:s';
+        $this->dateTime->fields = ['created_at', 'updated_at'];
+
+        $result = $this->dateTime->__invoke($this->data);
+
+        $this->assertEquals($result, [
+            'name' => 'Bar',
+            'created_at' => '1990-06-20 12:15:00',
+            'updated_at' => '2010-06-21 06:02:00',
+        ]);
+    }
+}

src/Transformer/DateTime.php

@@ -5,15 +5,20 @@
 class DateTime implements TransformInterface
 {
     public $fields = [];
-    public $format = 'Y-m-d H:i:s';
+    public $from = 'Y-m-d H:i:s';
+    public $to;
 
     public function __invoke(array $data): array
     {
         foreach($this->fields as $fieldName){
             $data[$fieldName] = \DateTime::createFromFormat(
-                $this->format,
+                $this->from,
                 $data[$fieldName]
             );
+
+            if($this->to){
+                $data[$fieldName] = $data[$fieldName]->format($this->to);
+            }
         }
 
         return $data;

src/Transformer/Sleep.php

@@ -6,19 +6,12 @@ class Sleep implements TransformInterface
 {
     public $seconds = 1;
 
-    /**
-     * The saved context, hydrated by the __invoke.
-     *
-     * @var array
-     */
-    protected $context = [];
-
     /**
      * The class entry point.
      */
     public function __invoke(array $data): array
     {
-        sleep($this->seconds);
+        usleep($this->seconds * 1000000);
 
         return $data;
     }