ios - XCTest : Can expectationForPredicate fulfill on async variable change?
<p><p>我正在使用 expect(for:evaluateWith:handler:) 来观察生产代码中的变量是否发生变化，但它从未实现 - 为什么？ </p>
<p>我不想通过添加人工完成 block 或通知来弄乱我的生产代码。 </p>
<pre><code>class ProductionClass {
var areWeDone = false
func doSomeStuff() {
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1) {
self.areWeDone = true
}
}
}
class Test: XCTestCase {
override func setUp() { }
override func tearDown() { }
func testDoSomeStuff() {
let productionClass = ProductionClass()
let predicate = NSPredicate(format: "areWeDone = %d", true)
let exp = expectation(for: predicate, evaluatedWith: productionClass, handler: nil)
productionClass.doSomeStuff()
let result = XCTWaiter.wait(for: , timeout: 3)
if result != XCTWaiter.Result.completed {
XCTAssert(false, "areWeDone changed but test timeout")
}
}
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>解决方案非常简单 - 只需确保“ProductionClass”类继承自 NSObject 并且您的测试将按预期工作:</p>
<pre><code>import Foundation
class ProductionClass : NSObject {
var areWeDone = false
func doSomeStuff() {
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1) {
self.areWeDone = true
}
}
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - XCTest : Can expectationForPredicate fulfill on async variable change?，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/53001940/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/53001940/
</a>
</p>
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