minor #7869 mention old way to create PHPUnit mock objects (xabbuh)

This PR was merged into the 2.7 branch.

Discussion
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mention old way to create PHPUnit mock objects

This addresses an issue raised in symfony/symfony#20948.

Commits
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ecec417 mention old way to create PHPUnit mock objects

Author: xabbuh

create_framework/unit_testing.rst

@@ -93,6 +93,9 @@ We are now ready to write our first test::
         private function getFrameworkForException($exception)
         {
             $matcher = $this->createMock(Routing\Matcher\UrlMatcherInterface::class);
+            // use getMock() on PHPUnit 5.3 or below
+            // $matcher = $this->getMock(Routing\Matcher\UrlMatcherInterface::class);
+
             $matcher
                 ->expects($this->once())
                 ->method('match')
@@ -149,6 +152,9 @@ Response::
     public function testControllerResponse()
     {
         $matcher = $this->createMock(Routing\Matcher\UrlMatcherInterface::class);
+        // use getMock() on PHPUnit 5.3 or below
+        // $matcher = $this->getMock(Routing\Matcher\UrlMatcherInterface::class);
+
         $matcher
             ->expects($this->once())
             ->method('match')

form/unit_testing.rst

@@ -185,6 +185,8 @@ allows you to return a list of extensions to register::
         protected function getExtensions()
         {
             $validator = $this->createMock(ValidatorInterface::class);
+            // use getMock() on PHPUnit 5.3 or below
+            // $validator = $this->getMock(ValidatorInterface::class);
             $validator
                 ->method('validate')
                 ->will($this->returnValue(new ConstraintViolationList()));

testing/database.rst

@@ -71,6 +71,8 @@ it's easy to pass a mock object within a test::
         {
             // First, mock the object to be used in the test
             $employee = $this->createMock(Employee::class);
+            // use getMock() on PHPUnit 5.3 or below
+            // $employee = $this->getMock(Employee::class);
             $employee->expects($this->once())
                 ->method('getSalary')
                 ->will($this->returnValue(1000));