Color asset test not working due to color not being loaded when test conditions are evaluated

Question

Created May ’23

Replies 2

Boosts 1

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I've written a Swift package plugin to add the colours provided in the asset bundles in an extension of the SwiftUI Color type but I'm having difficulties testing this since the bundle and/or colour that is in the asset catalogs are not yet loaded when XCTest goes to evaluate the test conditions. Here is my test code: (colours are just random colours, some derive from macOS colour picker; also, the new static method is functionality that I added and is not present in the existing Color APIs)

final class TestCase: XCTestCase {
func testBanana() {
        XCTAssertEqual(Color.banana, Color.new(from: "FEFC78")!)
    }
    
    func testAlexsColor() {
        XCTAssertEqual(Color.alexsColor, Color.new(from: "0432FF")!)
    }
    
    func testMaximumPowerColor() {
        XCTAssertEqual(Color.maximumPower, Color.new(from: "FF2600")!)
    }
    
    func testLongNameColor() {
        XCTAssertEqual(Color.reallyLongNameThatJustKeepsGoingOnAndOnAndOnAndOn, Color.new(from: "AAA000"))
    }
}

Here is an example error message that I get when I run the test:

testBanana(): XCTAssertEqual failed: ("NamedColor(name: "Banana", bundle: Optional(NSBundle &lt;&#x2F;Users&#x2F;trevorhafner&#x2F;Library&#x2F;Developer&#x2F;Xcode&#x2F;DerivedData&#x2F;TransportBase-cbagdabrompfzofwkimswvlsincu&#x2F;Build&#x2F;Products&#x2F;Debug&#x2F;TransportBaseTests.xctest&#x2F;Contents&#x2F;Resources&#x2F;TransportBase_TransportBaseTests.bundle> (not yet loaded)))") is not equal to ("#FEFC78FF")

Here is the autogenerated code that my Swift Package Plugin creates:

#if canImport(SwiftUI)
import SwiftUI
import Foundation

@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, *)
public extension Color {
    static let banana = Color("Banana", bundle: .module)
    static let alexsColor = Color("Alex&#039;s Color", bundle: .module)
    static let reallyLongNameThatJustKeepsGoingOnAndOnAndOnAndOn = Color("really long name that just keeps going on and on and on and on", bundle: .module)
    static let maximumPower = Color("Maximum Power", bundle: .module)
}
#endif

Does anyone know how to somehow instruct the bundle or the Color to load such that the comparison can be made correctly between the two colours?

Boost

Answer 1

DTS Engineer OP

Apple

May ’23

since the bundle and/or colour that is in the asset catalogs are not yet loaded

I think the not yet loaded message is a red herring. This is Bundle telling you that the bundle’s code isn’t loaded, and that makes sense because the .module bundle has no code.

I recommend that you temporarily expand the implementation of banana to run in multiple steps:

Locate the bundle.
Use a platform specific API (NSColor or UIColor) to get a colour from that bundle.
Create a Swift Color from that.

At which point does it fail?

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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1

Answer 2

fruitcoder_DE OP

Mar ’24

While I have a different setup the general problem remains them same. I use SwiftGen to generate symbols for my colors (and images, and Strings) and I get a crash when trying to access the color in a test (because it cannot be found in the bundle. Did you solve this issue somehow?

0