JSONAPI/Tests/JSONAPITests/Test Helpers/EncodeDecode.swift

//
//  EncodeDecode.swift
//  JSONAPITests
//
//  Created by Mathew Polzin on 11/16/18.
//

import Foundation
import XCTest

func decodedTestType<T: Codable & Equatable>(type: T.Type, data: Data) -> T {
	return try! JSONDecoder().decode(T.self, from: data)
}

/// A helper function that tests that decode() == decode().encode().decode().
/// If decoding is well tested and the above is true then encoding is well
/// tested.
func test_DecodeEncodeEquality<T: Codable & Equatable>(type: T.Type, data: Data) {
	let entity = try? JSONDecoder().decode(T.self, from: data)

	XCTAssertNotNil(entity)

	guard let e = entity else { return }

	let encodedEntity = try? JSONEncoder().encode(e)

	XCTAssertNotNil(encodedEntity)

	guard let ee = encodedEntity else { return }

	// check that decoding ee results in e
	XCTAssertEqual(try? JSONDecoder().decode(T.self, from: ee), e)
}