ViewInspector

0.9.2

Runtime introspection and unit testing of SwiftUI views
nalexn/ViewInspector

What's New

0.9.2

2022-09-17T13:59:39Z

Released on 2022-09-17.

Requires Xcode 14.0

What's new:

  • Adds support for SwiftUI 4.0

  • New APIs:

    • find(viewWithAccessibilityLabel: ) and find(viewWithAccessibilityIdentifier: ) (PR #168)
    • axes: Axis.Set and showsIndicators: Bool inspectable attributes on ScrollView
    • callOnSubmit inspection of the onSubmit modifier (PR #184)
    • primaryAction inspection support on Menu (#183)
    • Inspectable attributes on Rotation3D (PR #191)
    • Label(_:systemImage:) inspection (#176)
  • Fixes and PRs:

    • 'callOnChange' not recognizing Optional parameters (#163)
    • Error when accessing the keyboardType in TextField (#171)
    • Failure to find .background() when BackgroundView contains Color (#169)
    • Error 'Cannot find 'XCTFail' in scope' when integrating with CocoaPods (#145)

ViewInspector 🕵️‍♂️ for SwiftUI

Platform Build Status codecov

ViewInspector is a library for unit testing SwiftUI views. It allows for traversing a view hierarchy at runtime providing direct access to the underlying View structs.

Why?

SwiftUI view is a function of state. We could provide it with the input, but were unable to verify the output... Until now!

Helpful links

Use cases

1. Search the view of a specific type or condition

Use one of the find functions to quickly locate a specific view or assert there are none of such:

try sut.inspect().find(button: "Back")

try sut.inspect().findAll(ViewType.Text.self,
                          where: { try $0.attributes().isBold() })

Check out this section in the guide for the reference.

2. Read the inner state of the standard views

Standard SwiftUI views are no longer a black box:

let sut = Text("Completed by \(72.51, specifier: "%.1f")%").font(.caption)

let string = try sut.inspect().text().string(locale: Locale(identifier: "es"))
XCTAssertEqual(string, "Completado por 72,5%")

XCTAssertEqual(try sut.inspect().text().attributes().font(), .caption)

Each view has its own set of inspectable parameters, you can refer to the API coverage document to see what's available for a particular SwiftUI view.

3. Verify your custom view's state

Obtain a copy of your custom view with actual state and references from the hierarchy of any depth:

let sut = try view.inspect().find(CustomView.self).actualView()
XCTAssertTrue(sut.viewModel.isUserLoggedIn)

The library can operate with various types of the view's state, such as @Binding, @State, @ObservedObject and @EnvironmentObject.

4. Trigger side effects

You can simulate user interaction by programmatically triggering system-controls callbacks:

try sut.inspect().find(button: "Close").tap()

let list = try view.inspect().list()
try list[5].view(RowItemView.self).callOnAppear()

The library provides helpers for writing asynchronous tests for views with callbacks.

FAQs

Which views and modifiers are supported?

Check out the API coverage. There is currently almost full support for SwiftUI v1 API, the v2 and v3 support is under active development.

Is it using private APIs?

ViewInspector is using official Swift reflection API to dissect the view structures. So it'll be production-friendly even if you could somehow ship the test target to the production.

How do I add it to my Xcode project?

Assure you're adding the framework to your unit-test target. Do NOT add it to the main build target.

Swift Package Manager

https://github.com/nalexn/ViewInspector

Carthage

github "nalexn/ViewInspector"

CocoaPods

pod 'ViewInspector'

How do I use it in my project?

Please refer to the Inspection guide. You can also check out my other project that harnesses the ViewInspector for testing the entire UI.

Other questions, concerns or suggestions?

Ping me on Twitter or just submit an issue or a pull request on Github.


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Description

  • Swift Tools 5.3.0
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Dependencies

  • None
Last updated: Wed Nov 30 2022 02:53:01 GMT-0500 (GMT-05:00)