add validation to date metadata type

src/classes/metadata-types/date/class-tainacan-date.php

@@ -2,6 +2,8 @@
 
 namespace Tainacan\Metadata_Types;
 
+use Tainacan\Entities\Item_Metadata_Entity;
+
 defined( 'ABSPATH' ) or die( 'No script kiddies please!' );
 
 use Tainacan\Helpers;
@@ -28,4 +30,19 @@ class Date extends Metadata_Type {
                                value=\''.json_encode( $itemMetadata->get_value() ).'\'  
                                name="'.$itemMetadata->get_metadatum()->get_name().'"></tainacan-date>';
     }
+
+
+    public function validate( Item_Metadata_Entity $item_metadata) {
+        
+        $value = $item_metadata->get_value();
+
+        $format = 'Y-m-d';
+
+        $d = \DateTime::createFromFormat($format, $value);
+
+        return $d && $d->format($format) === $value;
+        
+    }
+
+
 }

src/importer/class-tainacan-test-importer.php

@@ -56,7 +56,7 @@ class Test_Importer extends Importer {
 	];
 
 	protected $date_values = [
-		'03/04/1993', '03/12/1998', '10/09/2001', '03/01/2018', '13/11/2016', '22/04/1993'
+		'1993-12-03', '1998-04-03', '2001-09-10', '2018-01-03', '2016-11-13', '1993-04-22'
 	];
 
 	protected $numeric_values = [

tests/test-date-metadatum-types.php

@@ -0,0 +1,81 @@
+<?php
+
+namespace Tainacan\Tests;
+
+/**
+ * Class TestCollections
+ *
+ * @package Test_Tainacan
+ */
+
+use Tainacan\Entities;
+
+/**
+ * Sample test case.
+ */
+class DateMetadatumTypes extends TAINACAN_UnitTestCase {
+
+	
+    function test_date_metadata_types() {
+
+        $Tainacan_Metadata = \Tainacan\Repositories\Metadata::get_instance();
+        $Tainacan_Item_Metadata = \Tainacan\Repositories\Item_Metadata::get_instance();
+        $Tainacan_Items = \Tainacan\Repositories\Items::get_instance();
+        
+        $collection = $this->tainacan_entity_factory->create_entity(
+			'collection',
+			array(
+				'name'   => 'test',
+			),
+			true
+		);
+		
+        
+        $metadatum = $this->tainacan_entity_factory->create_entity(
+        	'metadatum',
+	        array(
+	        	'name' => 'meta',
+		        'description' => 'description',
+		        'collection' => $collection,
+		        'metadata_type' => 'Tainacan\Metadata_Types\Date',
+				'status'	 => 'publish',
+	        ),
+	        true
+        );
+        
+		$i = $this->tainacan_entity_factory->create_entity(
+			'item',
+			array(
+				'title'         => 'item test',
+				'description'   => 'adasdasdsa',
+				'collection'    => $collection,
+				'status'		   => 'publish',
+			),
+			true
+		);
+		
+
+		$item_metadata = new \Tainacan\Entities\Item_Metadata_Entity($i, $metadatum);
+        
+        $item_metadata->set_value('2010-01-01');
+        $this->assertTrue($item_metadata->validate());
+        
+        $item_metadata->set_value('2010-12-01');
+        $this->assertTrue($item_metadata->validate());
+        
+        $item_metadata->set_value('2010-12-31');
+        $this->assertTrue($item_metadata->validate());
+        
+        $item_metadata->set_value('2010-22-01');
+        $this->assertFalse($item_metadata->validate());
+        
+        $item_metadata->set_value('3/3/1202');
+        $this->assertFalse($item_metadata->validate());
+        
+        $item_metadata->set_value('2010-02-30');
+		$this->assertFalse($item_metadata->validate());
+
+    }
+	
+    
+}