Why Accessibility IDs Over other Locators?

Accessibility IDs are favored in mobile app development and testing for several compelling reasons:

• Enhanced Test Execution Speed: Accessibility IDs are faster than other locator strategies like XPath or OS Native mechanisms. ID locators require only a single pass through the app's source code to locate an element, whereas XPath may need to traverse the entire source tree.
• Stable & Reliable Tests: ID locators are unique identifiers within the app's UI. Since identifiers are unique, they eliminate any uncertainty in element location, leading to more stable and low-maintenance tests.
• Broader App Accessibility: Implementing accessibility IDs helps in testing and enhances the user experience for individuals with disabilities. In markets such as the US and UK, where accessibility is a key consideration, this can significantly expand an app's user base.

Adding Accessibility IDs:

• Android: Use the contentDescription property to define accessibility IDs.
• iOS: Use the accessibilityIdentifier to define accessibility IDs.

Here's an infographic which gives more info:

References:

Android Developer - Accessibility

Buildfire - App Accessibility Mobile Development

Appium Pro - Pick Right Locator Strategy