如何使用 XCTAssertEqual 与可选模型属性进行比较答案

【问题标题】：How to compare to optional model properties with XCTAssertEqual如何使用 XCTAssertEqual 与可选模型属性进行比较
【发布时间】：2014-08-13 05:48:52
【问题描述】：

有没有更好的方法来比较我的模型对象中的值，而不是下面的 sn-p，它看起来非常冗长并且仅适用于一个属性？

模型对象

struct Address {

    static let kADDRESS1 = "address1"
    static let kADDRESS2 = "address2"
    static let kADDRESS3 = "address3"
    static let kCITY = "city"
    static let kSTATE = "state"
    static let kPOSTAL_CODE = "postalCode"

    var address1:String?,
    address2:String?,
    address3:String?,
    city:String?,
    state:String?,
    postalCode:String?

    init(address1: String?,
            address2: String?,
            address3: String?,
            city: String?,
            state: String?,
        postalCode: String?) {
            self.address1 = address1;
            self.address2 = address2;
            self.address3 = address3;
            self.city = city;
            self.state = state;
            self.postalCode = postalCode;

    }
    init(params:NSDictionary) {
        self.init(address1: params.objectForKey("address1") as String?,
            address2: params.objectForKey("address2") as String?,
            address3: params.objectForKey("address3") as String?,
            city: params.objectForKey("city") as String?,
            state: params.objectForKey("state") as String?,
            postalCode: params.objectForKey("state") as String?)
    }
}

来自测试用例 func testCreateAddress() {

let params:NSDictionary = [Address.kADDRESS1: "1 Main St.", Address.kADDRESS2: "Apt. 1", Address.kADDRESS3: "Box 1", Address.kCITY: "San Francisco", Address.kSTATE: "CA", Address.kPOSTAL_CODE: "7899"];

let address = Address(params:params);

if let param  = params[Address.kADDRESS1] as String? {
    if let property = address.address1 {
        XCTAssertEqual(property, param)
    }
    else {
        XCTFail("properties do not match")
    }
}
else {
    if let property = address.address1 {
        XCTFail("properties do not match")
    }
}

}

【问题讨论】：

标签： ios swift xctest

【解决方案1】：

我认为您可以在测试中假设一些事情：

XCTAssertEqual 会让您的测试失败（带有适当的错误消息）如果字符串不相等，因此您不需要任何XCTFail
params[Address.kADDRESS1] 绝对按照您刚刚定义的方式设置以上

所以我建议将您的测试更改为如下所示：

let params:NSDictionary = [Address.kADDRESS1: "1 Main St.", Address.kADDRESS2: "Apt. 1", Address.kADDRESS3: "Box 1", Address.kCITY: "San Francisco", Address.kSTATE: "CA", Address.kPOSTAL_CODE: "7899"]

let address = Address(params:params)
XCTAssertNotNil(address.address1)
XCTAssertEqual(address.address1!, params[Address.kADDRESS1], "address1 should be set")

我承认，如果 address.adress1 为 nil，您将收到运行时异常，因为 XCTAssertEqual 将无法解开变量，但 XCTAssertNotNil 会提前失败，因此您知道发生了什么。

【讨论】：

虽然在这个测试中 params[Address.kAddress] 不为空，但它将在其他测试中，如果它们都为空，我将不得不比较，我最终想把它变成我可以用任何参数排列调用的函数

【解决方案2】：

我想我找到了更简洁的方法：

    if(address.address1? != nil && params[Address.kADDRESS1]? != nil) {
        XCTAssertEqual(address.address1!, params[Address.kADDRESS1]!)
    }

【讨论】：

你需要给测试失败的机会。如果其中一个值为 nil，这将跳过测试，并且您永远不会仅从测试中知道。此外，您应该解开不变量中的选项。