我正在阅读作者Kent Beck撰写的名为“以测试为导向的发展”的书。
我正在尝试在php中编写类似的函数但不了解这些步骤。
原始功能:
测试功能:
public void testEquality() {
assertTrue(new Dollar(5).equals(new Dollar(5)));
assertFalse(new Dollar(5).equals(new Dollar(6)));
}
班级职能:
public boolean equals(Object object) {
Dollar dollar = (Dollar) object;
return amount == dollar.amount;
}
我的代码:
测试功能:
public function setup() {
$this->dollarFive = new Dollar(5);
}
public function testEquality() {
$this->assertTrue($this->dollarFive->equals(new Dollar(5)));
}
班级职能:
class Dollar
{
public function __construct($amount) {
$this->amount = (int) $amount;
}
public function equals(Dollar $object) {
$this->Object = $object;
return $this->amount == $this->Object;
}
}
执行测试用例时,我收到以下错误。
类Dollar的对象无法转换为int
需要一些帮助。我该如何解决这个问题?
答案 0 :(得分:8)
return $this->amount == $this->Object;
$this->amount
是一个int,$this->Object
不是int。你试图相互比较,因此你会得到
类Dollar的对象无法转换为int
你可能意味着
return $this->amount == $this->Object->amount;
但是,你的班级也有一些奇怪的东西
class Dollar {
public $amount = 0; // <-- forgotten
public function __construct($amount) {
$this->amount = (int) $amount;
}
public function equals(Dollar $object) {
$this->Object = $object; // <--- ?!?
return $this->amount == $this->Object;
}
}
你可能只想要
public function equals(Dollar $object) {
return $this->amount == $object->amount;
}