/**
  * @covers Ebizmarts\MageMonkey\Model\Plugin\Subscriber::beforeSubscribeCustomerById
  */
 public function testBeforeSubscribeCustomerById()
 {
     $this->plugin->beforeSubscribeCustomerById($this->subscriberMock, 1);
     $this->helperMock->expects($this->exactly(2))->method('isDoubleOptInEnabled')->willReturn(true);
     $this->plugin->beforeSubscribeCustomerById($this->subscriberMock, 1);
     $this->helperMock->expects($this->once())->method('getMergeVars')->willReturn(['FNAME' => 'fname']);
     $this->plugin->beforeSubscribeCustomerById($this->subscriberMock, 1);
 }