Added mixed values support test and example

Author: Petr Knap

README.md

@@ -7,6 +7,7 @@ Enumerated type for PHP by [Petr Knap].
 * [Usage of php-enum](#usage-of-php-enum)
     * [Enum declaration](#enum-declaration)
     * [Enum usage](#enum-usage)
+    * [Tips & Tricks](#tips--tricks)
 * [How to install](#how-to-install)
 
 
@@ -131,6 +132,29 @@ if (date('w') == DayOfWeekEnum::FRIDAY()->getValue()) {
 }
 ```
 
+### Tips & Tricks
+
+Enum is capable to carry any data type as values, including another enum instance.
+
+```php
+class MixedValues extends \PetrKnap\Php\Enum\Enum
+{
+    protected function members()
+    {
+        return array(
+            "null" => null,
+            "boolean" => true,
+            "integer" => 1,
+            "float" => 1.0,
+            "string" => "s",
+            "array" => array(),
+            "object" => new \stdClass(),
+            "callable" => function() {}
+        );
+    }
+}
+```
+
 
 ## How to install
 

tests/Enum/EnumTest.php

@@ -5,6 +5,7 @@
 use PetrKnap\Php\Enum\Enum;
 use PetrKnap\Php\Enum\Exception\EnumException;
 use PetrKnap\Php\Enum\Exception\EnumNotFoundException;
+use PetrKnap\Php\Enum\Test\EnumTest\MixedValues;
 use PetrKnap\Php\Enum\Test\EnumTest\MyBoolean;
 
 class EnumTest extends \PHPUnit_Framework_TestCase
@@ -92,4 +93,23 @@ public function dataToStringWorks()
             array(MyBoolean::MY_FALSE(), MyBoolean::getClass() . "::MY_FALSE")
         );
     }
+
+    /**
+     * @dataProvider dataMixedValuesAreSupported
+     * @param MixedValues $enum
+     * @param string $expectedDataType
+     */
+    public function testMixedValuesAreSupported(MixedValues $enum, $expectedDataType)
+    {
+        $this->assertInternalType($expectedDataType, $enum->getValue());
+    }
+
+    public function dataMixedValuesAreSupported()
+    {
+        $data = array();
+        foreach (MixedValues::getMembers() as $name => $ignored) {
+            $data[] = array(MixedValues::__callStatic($name, array()), $name);
+        }
+        return $data;
+    }
 }

tests/Enum/EnumTest/MixedValues.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace PetrKnap\Php\Enum\Test\EnumTest;
+
+use PetrKnap\Php\Enum\Enum;
+
+class MixedValues extends Enum
+{
+    /**
+     * @inheritdoc
+     */
+    protected function members()
+    {
+        return array(
+            "null" => null,
+            "boolean" => true,
+            "integer" => 1,
+            "float" => 1.0,
+            "string" => "s",
+            "array" => array(),
+            "object" => new \stdClass(),
+            "callable" => function() {}
+        );
+    }
+}

tests/Enum/EnumTest/MyBoolean.php

@@ -10,6 +10,9 @@
  */
 class MyBoolean extends Enum
 {
+    /**
+     * @inheritdoc
+     */
     protected function members()
     {
         return array(