'abc', 'g-recaptcha-response' => 'def', ], true ); $context = new DerivativeContext( RequestContext::getMain() ); $context->setRequest( $request ); $form = new HTMLForm( [ 'foo' => [ 'class' => HTMLReCaptchaNoCaptchaField::class, 'key' => '123', ], ], $context ); $mockClosure = $this->getMockBuilder( stdClass::class ) ->addMethods( [ '__invoke' ] )->getMock(); $mockClosure->expects( $this->once() )->method( '__invoke' ) ->with( [ 'foo' => 'def' ] )->willReturn( true ); $form->setTitle( Title::newFromText( 'Title' ) ); $form->setSubmitCallback( $mockClosure ); $form->prepareForm(); $form->trySubmit(); } }