Update README.md

Author: leberknecht

README.md

@@ -26,10 +26,89 @@ $bundles = [
 ```
 
 ## Generate unit-tests from service classes
-From time to time it happens that a dev looses the strict tests-first pattern and writes a service
-without a proper test, and later on he wants to add a phpunit-test for this service. 
-Your service probably has some dependencies in the constructor, and now you have to setup mocks for that.
+From time to time it happens that a dev is confronted with a brownfield service that has no unit-test, and wants to fix that. If the service has a lot of dependencies in the constructor, preparing the mocks for that can be really annoying (yes, the clean solution is to split the service to smaller parts with nice and easy-to-mock constructor). Anyways, if you are in a situation where you want to add a proper test for a monster-service, this tool can be ver handy.
+
+Lets say you have a simple service like this: 
+
+```php
+<?php
+namespace Tps\UtilBundle\Tests\Fixtures;
+
+use Doctrine\ORM\EntityManager;
+use Symfony\Bundle\TwigBundle\TwigEngine;
+use Symfony\Component\Form\Form;
+
+class ExampleClass {
+    /**
+     * @var EntityManager
+     */
+    private $testForm;
+    /**
+     * @var TwigEngine
+     */
+    private $templating;
+    /**
+     * @var string
+     */
+    private $primitiveParameter;
+
+    public function __construct(Form $testForm, TwigEngine $templating, $primitiveParameter)
+    {
+        $this->testForm = $testForm;
+        $this->templating = $templating;
+        $this->primitiveParameter = $primitiveParameter;
+    }
+    [...]
+```
+
 To generate a base template for a service test, run the command
 
-    app/console tps:util:generate-service-test "Acme\DemoBundle\Service\MyService"
+    app/console tps:util:generate-service-test 'Tps\UtilBundle\Tests\Fixtures\ExampleClass'
 
+Generated output will be:
+
+```php
+<?php
+
+namespace Tps\UtilBundle\Tests\Tests\Fixtures;
+
+use PHPUnit_Framework_MockObject_MockObject;
+use Tps\UtilBundle\Tests\Fixtures\ExampleClass;
+use Symfony\Component\Form\Form;
+use Symfony\Bundle\TwigBundle\TwigEngine;
+
+class ExampleClassTest extends \PHPUnit_Framework_TestCase
+{
+   /**
+    * @var PHPUnit_Framework_MockObject_MockObject|\Symfony\Component\Form\Form
+    */
+    private $formMock;
+   /**
+    * @var PHPUnit_Framework_MockObject_MockObject|\Symfony\Bundle\TwigBundle\TwigEngine
+    */
+    private $twigEngineMock;
+   /**
+    * @var int|string|boolean|array
+    */
+    private $primitiveParameter = null;
+
+   /**
+    * @var PHPUnit_Framework_MockObject_MockObject|\Tps\UtilBundle\Tests\Fixtures\ExampleClass
+    */
+    private $exampleClass;
+
+    public function setUp()
+    {
+        $this->formMock = $this->getMockBuilder(Form::class)
+            ->disableOriginalConstructor()->getMock();
+        $this->twigEngineMock = $this->getMockBuilder(TwigEngine::class)
+            ->disableOriginalConstructor()->getMock();
+
+        $this->exampleClass = new ExampleClass(
+            $this->formMock,
+            $this->twigEngineMock,
+            $this->primitiveParameter
+        );
+    }
+}
+```