XCTest用于模型对象中的测试设置器

Question

I have a model object with computed variables. now i want to test setter of the variable. i wrote a test case and it gives the following error

XCTAssertEqual failed: ("nil") is not equal to ("Optional("example@gmail.com")") -

bellow i have mentioned the test case which i wrote

func testNetworkModelObjectSet() {

    let testObject = ["network": ["first_name": "Dimuth", "last_name": "Lasantha", "business_email": "testemail@gmail.com", "currency": "USD", "language": "en-us", "category": "individual"]]

    let network = HVConnection(data: testObject)

    network.business_email = "example@gmail.com"

    XCTAssertEqual(network.business_email, "example@gmail.com")
}

here i have mentioned the related model object variable

class HVConnection: NSObject {

    //private var _data: NSMutableDictionary
    private var _data: NSMutableDictionary

    // MARK:- Init

    init(data: NSDictionary)
    {
        _data = NSMutableDictionary(dictionary: data)
    }

    var business_email: String? {

        get {
            if let businessemailObject = _data.objectForKey("network")?.objectForKey("business_email") {
                return (businessemailObject as! String)
            } else {
                return nil
            }
        }

        set {
            _data = ["business_email": newValue!]
        }
    }
}

Answer 1

You are reading from _data["network"]["business_email"] , but writing to _data["business_email"] . You should either update the getter, or the setter, depending on specifications.

As a side note, you can rewrite the getter in a more shorter/readable manner:

get {
    return _data["network"]?["business_email"] as? String
}

The optional chaining feature of Swift makes it very easy to check for nil in chain of method calls.

Also note that the setter will crash the app if a nil value is passed, as the forced unwrap crashes when trying to unwrap nils.

Answer 2

by setting network.business_email = "example@gmail.com" you are overriding the content of _data with ["business_email": newValue!] .

This will cause the getter to return nil since it will enter the else case because _data.objectForKey("network") is nil . Hence, the behaviour is as expected.

Answer 3

I have changed the setter as follows

set {
        _data = ["network":["business_email": newValue!]]
    }

Now the test case passed