How can I get XCTest to wait for async calls in setUp before tests are run?

Question

I\'m writing integration tests in Xcode 6 to go alongside my unit and functional tests. XCTest has a setUp() method that gets called before every test. Great!

It al

Answer 1

Swift 4.2

use this extension:

import XCTest

extension XCTestCase {
    func wait(interval: TimeInterval = 0.1 , completion: @escaping (() -> Void)) {
        let exp = expectation(description: "")
        DispatchQueue.main.asyncAfter(deadline: .now() + interval) {
            completion()
            exp.fulfill()
        }
        waitForExpectations(timeout: interval + 0.1) // add 0.1 for sure asyn after called
    }
}

and usage like this:

func testShoudDeleteSection() {
        let tableView = TableViewSpy()
        sut.tableView = tableView

        sut.sectionDidDelete(at: 0)

        wait {
            XCTAssert(tableView.isReloadDataCalled, "Chcek relaod table view after section delete")
        }
    }

example above isn't complete but you can get the idea. hope this help.