代码之家 › 专栏 › 技术社区 › Declan McKenna

如何对静态属性进行单元测试?

static unit-testing swift ios

Declan McKenna · 技术社区 · 7 年前

我有一个 ConferenceNumberDirectory build 函数,该函数解析JSON文件以创建 ConferenceNumber 物体。我想对这个函数进行单元测试。

我使用一个较小的JSON文件创建了一个单元测试来测试这一点,但我的测试失败了,因为测试值只是附加到实际值上。 ConferenceNumberDirectory.att 数组,但当我运行测试时,这些值仍然在这里,并且我的测试值(13个条目)被附加到原始数组中。如何测试静态属性而不让测试数据影响它们?在之前提交的单元测试中属性和实际的一个是独立的实体,我不知道这里发生了什么(自从这次提交以来,我没有更改我的测试类)。

class ConferenceNumberDirectory {

static var countryNumbers = [Any]()
static var att = [ConferenceNumber]()
static var arkadin = [ConferenceNumber]()
static var webex = [ConferenceNumber]()
static var zoom = [ConferenceNumber]()

   static func build(from rootJSONArray: [Any]?) {

do {
        guard let rootJSONArray = rootJSONArray else {
            throw SerializationError.missing("JSON Root")
        }

        for entry in rootJSONArray {
            guard let dictionary = entry as? [String: Any] else {
                throw SerializationError.missing("JSON Root")
            }
            guard let isoCode = dictionary["ISO Code"] as? String else {
                throw SerializationError.missing("isoCode")
            }
            guard let country = dictionary["Country"] as? String else {
                throw SerializationError.missing("country")
            }

            if let attTollNumbers = try self.extractNumbers(from: dictionary, forKey: "AT&T toll") {
                ConferenceNumberDirectory.att.append(contentsOf: attTollNumbers.map{ConferenceNumber(ISO: isoCode, country: country, number: $0, provider: ConferenceProvider.att, toll: true) })
            }
            print(ConferenceNumberDirectory.att.count)
            if let attTollFreeNumbers = try self.extractNumbers(from: dictionary, forKey: "AT&T toll-free") {
                ConferenceNumberDirectory.att.append(contentsOf: attTollFreeNumbers.map{ConferenceNumber(ISO: isoCode, country: country, number: $0, provider: ConferenceProvider.att, toll: false)})
            }
            if let arkadinTollNumbers = try self.extractNumbers(from: dictionary, forKey: "Arkadin toll") {
                ConferenceNumberDirectory.arkadin.append(contentsOf: arkadinTollNumbers.map{ConferenceNumber(ISO: isoCode, country: country, number: $0, provider: ConferenceProvider.arkadin, toll: true) })
            }
            if let arkadinTollFreeNumbers = try self.extractNumbers(from: dictionary, forKey: "Arkadin toll-free") {
                ConferenceNumberDirectory.arkadin.append(contentsOf: arkadinTollFreeNumbers.map{ConferenceNumber(ISO: isoCode, country: country, number: $0, provider: ConferenceProvider.arkadin, toll: false) })
            }
            if let webexTollNumbers = try self.extractNumbers(from: dictionary, forKey: "Webex toll") {
                ConferenceNumberDirectory.webex.append(contentsOf: webexTollNumbers.map{ConferenceNumber(ISO: isoCode, country: country, number: $0, provider: ConferenceProvider.webex, toll: true) })
            }
            if let webexTollFreeNumbers = try self.extractNumbers(from: dictionary, forKey: "Webex toll-free") {
                ConferenceNumberDirectory.webex.append(contentsOf: webexTollFreeNumbers.map{ConferenceNumber(ISO: isoCode, country: country, number: $0, provider: ConferenceProvider.webex, toll: false) })
            }
            if let zoomTollNumbers = try self.extractNumbers(from: dictionary, forKey: "Zoom toll") {
                ConferenceNumberDirectory.zoom.append(contentsOf: zoomTollNumbers.map{ConferenceNumber(ISO: isoCode, country: country, number: $0, provider: ConferenceProvider.zoom, toll: true) })
            }
        }
    }
    catch let error {
        print(error)
    }

}

1 回复 | 直到 7 年前

Losiowaty 7 年前

因为你的财产 static ,它们在代码的整个执行过程中都存在-它们不需要类的实际实例就可以保留在内存中。这就是为什么 静止的 静止的 in the docs, under "Type properties" .

关于你手头的问题:
tearDown() 方法,并将这些属性恢复到其空状态。 撕裂() XCTestCase

override func tearDown() {
    ConferenceNumberDirectory.att = []()
    super.tearDown()
}

编辑:

override func setUp() {
    super.setUp()
    ConferenceNumberDirectory.att = []()
}

此方法在运行每个测试用例之前运行。我强烈建议通读一遍 XCTest documentation.