SDWebImageMockPlugin makes possible the creation of snapshot testing with views using SDWebImage to configure images.

To run the example project, clone the repo, and run pod install from the Example directory first.

This modules provides a ImageCacheMocker which allow you to mock all images requested by SDWebImage. To enable its mocking capabilities call its method setupSDWebImageMocking(), after that all requests from SDWebImage will use this cache instance.

class Tests: XCTestCase {

    var imageMocker = ImageCacheMocker()

    override func setUp() {
        super.setUp()
        imageMocker.setupSDWebImageMocking()
    }
    
    // Your snapshot tests here
}

Once the mocker in place the image configured by SDWebImage will depend on the url format. Here the list of the default behaviors:

• size://1920x1080 will provide an image with a width of 1920pt and an height of 1080pt
• ratio://3:2 will provide an image with a ratio of 3/2 and a constant height of 500pt
• bundle://main/mySampleImage will provide the image named mySampleImage from Bundle.main (by default main is the only identifier configured in ImageCacheMocker)

Any other urls will return a default image.

Extension on URL are provided to construct those default urls:

URL.imageMock(forWidth: 500, height: 100) // -> size://500x100
URL.imageMock(withRatio: Double(16) / Double(9)) // -> ratio://1.7777777777777777:1 (equivalent to ratio://16:9)
URL.imageMock(named: "sampleImage1", inBundleID: "testBundle") // -> bundle://testBundle/sampleImage1

Those behaviors are customizable by registering a custom image provider using ImageCacheMocker.registerProvider(:).

You can find the example Tests here: Tests.swift, and the snapshots for those tests:

testViewController.1.png	testMultipleImagesViewController.1.png	testConfiguredMultipleImagesViewController.1.png

SDWebImageMockPlugin is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'SDWebImageMockPlugin'

SDWebImageMockPlugin can be installed as a Swift Package with Xcode 11 or higher. To install it, add a package using Xcode or a dependency to your Package.swift file:

.package(url: "https://github.com/faberNovel/SDWebImageMockPlugin")

SDWebImageMockPlugin is owned and maintained by Fabernovel. You can follow us on Twitter at @Fabernovel.

SDWebImageMockPlugin is available under the MIT license. See the LICENSE file for more info.