Resource.swift

import Foundation

//    # Structure
//    - SwiftPackage
//      - Sources
//      - Tests
//          - Resources
//              - test.txt
//      - SwiftPackageTests
//          - SwiftPackageTests.swift
//
//    # Usage in SwiftPackageTests.swift
//    let file = Resource(name: "test", type: "txt")
//    let content = String(bytes: file.content!, encoding: .utf8)
//    XCTAssertEqual("Hello World!\n", content)

struct Resource {
    let name: String
    let type: String

    var path: String {
        let components = (#file as NSString).pathComponents
        let resourcePath = ["Resources", filename]
        let finalComponents = components.prefix(components.count - 2) + resourcePath
        return finalComponents.joined(separator: "/")
    }

    var url: URL { URL(fileURLWithPath: path) }

    var filename: String { "\(name).\(type)" }

    var content: Data? { try? Data(contentsOf: url) }

    init(name: String, type: String) {
        self.name = name
        self.type = type
    }
}