XCTestCase+Loading.swift

import XCTest

extension XCTestCase {
    private class TestBundle { }
    
    func deserializedObject<T: Decodable>(resourceName: String) throws -> T {
        let bundle = Bundle(for: TestBundle.self)
        let url = try XCTUnwrap(bundle.url(forResource: resourceName, withExtension: "json"))
        let data = try Data(contentsOf: url)
        
        return try JSONDecoder().decode(T.self, from: data)
    }
    
    func loadJSON(resourceName: String) throws -> Any {
        let bundle = Bundle(for: TestBundle.self)
        let url = try XCTUnwrap(bundle.url(forResource: resourceName, withExtension: "json"))
        let data = try Data(contentsOf: url)
        
        return try JSONSerialization.jsonObject(with: data)
    }
    
    func loadData(resourceName: String) throws -> Data {
        let bundle = Bundle(for: TestBundle.self)
        let url = try XCTUnwrap(bundle.url(forResource: resourceName, withExtension: "json"))
        
        return try Data(contentsOf: url)
    }
}