Asynchronous UI testing in Swift

Question

I have a button in a UI test that logs in to an app. The user flow to automate is this:

User taps button
Button text changes from "Log In" to "Processing..."
Button disappears when log in is successful

My UI test code is very simple for the functional test:

let loginButton = app.buttons["LOG IN"]
let welcomeText = app.staticTexts["Welcome!"]
loginButton.tap()
XCTAssertTrue(welcomeText.waitForExistence(10))

However, it does not validate that the button changes state to "Processing...".

If I attempt to put a check in the code like this, it doesn't work because by the time the UI Test has walked the screen looking for the text, it might have disappeared.

let loginButton = app.buttons["LOG IN"]
let loginButtonProcessingText = app.buttons.staticTexts["Processing..."]
let welcomeText = app.staticTexts["Welcome!"]
loginButton.tap()
XCTAssertTrue(loginButtonProcessingText.exists)
XCTAssertTrue(welcomeText.waitForExistence(10))

So my thought is that I need to somehow start the check for the processing test simultaneously with the button tap, or maybe a second before it.

Is there a way to spin up a check like that asynchronously in XCUI testing?

What is the app flow? In which controller `Welcome!` text is in? — dahiya_boy, May 20 '20 at 17:04
Could you describe what you mean by app flow? There are different controllers for the loginButton and the subsequent Welcome text. The app flow is incredibly simple: WebView instantiates all buttons and fields. loginButton is a webView button loginButton, when tapped, begins authentication and simultaneously changes text to "Processing..." — Sean Long, May 20 '20 at 19:01

score 1 · Accepted Answer · answered Jun 02 '20 at 07:53

You can use expectation to test asynchronous task. But first it can be more clear if you separate your steps like below;

let loginButton = app.buttons["LOG IN"]
loginButton.tap()

let loginButtonProcessingText = app.buttons.staticTexts["Processing..."]
XCTAssertTrue(loginButtonProcessingText.exists)

let welcomeText = app.staticTexts["Welcome!"]
XCTAssertTrue(welcomeText.waitForExistence(10))

Asynchronous UI testing in Swift

1 Answers1