public function testSubtract()
{
$mocks['currency'] = $this->getMockBuilder('\\SerendipityHQ\\Component\\ValueObjects\\Currency\\Currency')->disableOriginalConstructor()->getMock();
$mocks['currency']->method('getSubUnit')->willReturn(100);
$mocks['currency']->method('getDefaultFractionDigits')->willReturn(2);
$test = ['amount' => 100, 'currency' => $mocks['currency']];
$resource = new Money($test);
$toAdd = new Money($test);
$result = $resource->subtract($toAdd);
// Test the value object direct interface
$this->assertInstanceOf(MoneyInterface::class, $result);
// Test the type of value object interface
$this->assertInstanceOf(ComplexValueObjectInterface::class, $result);
$this->assertInstanceOf(CurrencyInterface::class, $result->getCurrency());
$this->assertEquals(0, $result->getAmount());
}
