extracted date format converting to a helper class

framework/helpers/FormatConverter.php

+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\helpers;
+
+/**
+ * FormatConverter provides functionality to convert between different formatting pattern formats.
+ *
+ * It provides functions to convert date format patterns between different conventions.
+ *
+ * @author Carsten Brandt <mail@cebe.cc>
+ * @author Enrica Ruedin <e.ruedin@guggach.com>
+ * @since 2.0
+ */
+class FormatConverter extends BaseFormatConverter
+{
+}

tests/unit/framework/helpers/FormatConverterTest.php

+<?php
+
+// override information about intl
+namespace yii\helpers {
+    use yiiunit\framework\i18n\FormatterTest;
+    if (!function_exists('yii\helpers\extension_loaded')) {
+        function extension_loaded($name)
+        {
+            if ($name === 'intl' && FormatterTest::$enableIntl !== null) {
+                return FormatterTest::$enableIntl;
+            }
+            return \extension_loaded($name);
+        }
+    }
+}
+
+namespace yiiunit\framework\helpers {
+
+use Yii;
+use yii\helpers\FormatConverter;
+    use yii\i18n\Formatter;
+    use yiiunit\framework\i18n\FormatterTest;
+use yiiunit\TestCase;
+
+/**
+ * @group helpers
+ */
+class FormatConverterTest extends TestCase
+{
+    protected function setUp()
+    {
+        parent::setUp();
+
+        // emulate disabled intl extension
+        // enable it only for tests prefixed with testIntl
+        FormatterTest::$enableIntl = null;
+        if (strncmp($this->getName(false), 'testIntl', 8) === 0) {
+            if (!extension_loaded('intl')) {
+                $this->markTestSkipped('intl extension is not installed.');
+            }
+            FormatterTest::$enableIntl = true;
+        } else {
+            FormatterTest::$enableIntl = false;
+        }
+
+        $this->mockApplication([
+            'timeZone' => 'UTC',
+            'language' => 'ru-RU',
+        ]);
+    }
+
+    protected function tearDown()
+    {
+        parent::tearDown();
+        FormatterTest::$enableIntl = null;
+    }
+
+    public function testIntlIcuToPhpShortForm()
+    {
+        $this->assertEquals('m/j/y', FormatConverter::convertDateIcuToPhp('short', 'date', 'en-US'));
+        $this->assertEquals('d.m.y', FormatConverter::convertDateIcuToPhp('short', 'date', 'de-DE'));
+    }
+
+    public function testIntlOneDigitIcu()
+    {
+        $formatter = new Formatter(['locale' => 'en-US']);
+        $this->assertEquals('24.8.2014', $formatter->asDate('2014-8-24', 'php:d.n.Y'));
+        $this->assertEquals('24.8.2014', $formatter->asDate('2014-8-24', 'd.M.yyyy'));
+    }
+
+    public function testOneDigitIcu()
+    {
+        $formatter = new Formatter(['locale' => 'en-US']);
+        $this->assertEquals('24.8.2014', $formatter->asDate('2014-8-24', 'php:d.n.Y'));
+        $this->assertEquals('24.8.2014', $formatter->asDate('2014-8-24', 'd.M.yyyy'));
+    }
+}
+}
\ No newline at end of file

tests/unit/framework/i18n/FormatterTest.php

 <?php
-/**
- * @link http://www.yiiframework.com/
- * @copyright Copyright (c) 2008 Yii Software LLC
- * @license http://www.yiiframework.com/license/
- */
 
-namespace yii\i18n;
+// override information about intl
+namespace yii\helpers {
+    use yiiunit\framework\i18n\FormatterTest;
+    if (!function_exists('yii\helpers\extension_loaded')) {
+        function extension_loaded($name)
+        {
+            if ($name === 'intl' && FormatterTest::$enableIntl !== null) {
+                return FormatterTest::$enableIntl;
+            }
+            return \extension_loaded($name);
+        }
+    }
+}
 
 // override information about intl
-use yiiunit\framework\i18n\FormatterTest;
+namespace yii\i18n {
+    use yiiunit\framework\i18n\FormatterTest;
 
-function extension_loaded($name)
-{
+    function extension_loaded($name)
+    {
         if ($name === 'intl' && FormatterTest::$enableIntl !== null) {
             return FormatterTest::$enableIntl;
         }
         return \extension_loaded($name);
+    }
 }
 
-namespace yiiunit\framework\i18n;
+namespace yiiunit\framework\i18n {
 
 use yii\base\InvalidParamException;
 use yii\i18n\Formatter;
@@ -64,6 +73,7 @@ class FormatterTest extends TestCase
     protected function tearDown()
     {
         parent::tearDown();
+        static::$enableIntl = null;
         $this->formatter = null;
     }
 
@@ -794,3 +804,4 @@ class FormatterTest extends TestCase
         $this->assertSame("1023 bytes", $this->formatter->asSize(1023));
     }
 }
+}