Can I mock an interface implementation with PHPUnit?

Question

I've got an interface I'd like to mock. I know I can mock an implementation of that interface, but is there a way to just mock the interface?

<?php require __DIR__ . '/../vendor/autoload.php';  use My\Http\IClient as IHttpClient;  // The interface use My\SomethingElse\Client as SomethingElseClient;   class SomethingElseClientTest extends PHPUnit_Framework_TestCase {   public function testPost() {     $url = 'some_url';     $http_client = $this->getMockBuilder('Cpm\Http\IClient');     $something_else = new SomethingElseClient($http_client, $url);   } } 

What I get here is:

1) SomethingElseTest::testPost Argument 1 passed to Cpm\SomethingElse\Client::__construct() must be an instance of My\Http\IClient, instance of PHPUnit_Framework_MockObject_MockBuilder given, called in $PATH_TO_PHP_TEST_FILE on line $NUMBER and defined 

Interestingly, PHPUnit, mocked interfaces, and instanceof would suggest this might work.

Answer 1

Instead of

$http_client = $this->getMockBuilder(Cpm\Http\IClient::class); 

use

$http_client = $this->getMock(Cpm\Http\IClient::class); 

or

$http_client = $this->getMockBuilder(Cpm\Http\IClient::class)->getMock(); 

Totally works!