public function test_getSetAmount_returnsCorrectly()
{
$mockAmount = 1;
$mockNewAmount = 2;
$mockType = "mock";
$budget = new Budget($mockAmount);
$budget->setAmountType($mockType);
$this->assertEquals($mockType, $budget->getAmountType());
$this->assertFalse($budget->isValid());
$budget->setAmount($mockNewAmount);
$this->assertEquals($mockNewAmount, $budget->getAmount());
}
