SnapshotTesting を Xcode Cloud でつかうと, snapshot が見つからない問題がでてくるので、対応する ref: https://github.com/pointfreeco/swift-snapshot-testing/discussions/553 ref: https://gist.github.com/qmoya/dc007b682b47e6d59f2c65705c067d81

SnapshotHelper.swift

// SnapshotTesting を Xcode Cloud でつかうと,
// snapshot が見つからない問題がでてくるので、対応する
// ref: https://github.com/pointfreeco/swift-snapshot-testing/discussions/553
// ref: https://gist.github.com/qmoya/dc007b682b47e6d59f2c65705c067d81

import UIKit
import SnapshotTesting
import XCTest

private let ArtifactsPath = "SnapshotTestArtifacts"
private let CIPath = "ci_scripts"

private func snapshotDirectory(file: StaticString = #file) -> String? {
    // remove TestHelper/SnapshotHelper.swift from #file
    let snapshotHelperPath = URL(fileURLWithPath: #file)
        .deletingLastPathComponent()
        .deletingLastPathComponent()
        .path

    let filePath: String
    if let ciWorkspace = ProcessInfo.processInfo.environment["CI_WORKSPACE"], !ciWorkspace.isEmpty {
        filePath = ciWorkspace
    } else {
        filePath = snapshotHelperPath
    }

    let sourceRoot = URL(fileURLWithPath: filePath,
                         isDirectory: true)
    let fileUrl = URL(fileURLWithPath: "\(file)", isDirectory: false)
    let fileName = fileUrl.deletingPathExtension().lastPathComponent
    // remove FILENAME.swift and add __Snapshots__/FILENAME
    let absoluteSourceTestPath = fileUrl
        .deletingLastPathComponent()
        .appendingPathComponent("__Snapshots__")
        .appendingPathComponent(fileName)
    var components = absoluteSourceTestPath.pathComponents
    let sourceRootComponents = sourceRoot.pathComponents
    for component in sourceRootComponents {
        if components.first == component {
            components = Array(components.dropFirst())
        } else {
            return nil
        }
    }
    var snapshotDirectoryUrl = sourceRoot.appendingPathComponent(ArtifactsPath)
    if  ProcessInfo.processInfo.environment["CI"] == "TRUE" {
        snapshotDirectoryUrl = sourceRoot
            .appendingPathComponent(CIPath)
            .appendingPathComponent(ArtifactsPath)
    }

    for component in components {
        snapshotDirectoryUrl = snapshotDirectoryUrl.appendingPathComponent(component)
    }
    return snapshotDirectoryUrl.path
}

func assertSnapshot<Value, Format>(
    matching value: @autoclosure () throws -> Value,
    as snapshotting: Snapshotting<Value, Format>,
    named name: String? = nil,
    record recording: Bool = false,
    timeout: TimeInterval = 5,
    file: StaticString = #file,
    testName: String = #function,
    line: UInt = #line
) {
    let failure = verifySnapshot(
        matching: try value(),
        as: snapshotting,
        named: name,
        record: recording,
        snapshotDirectory: snapshotDirectory(file: file),
        timeout: timeout,
        file: file,
        testName: testName
    )

    guard let message = failure else { return }
    XCTFail(message, file: file, line: line)
}