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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import Foundation
import XCTest
/// Checks the encoding of the given value against the given json string and verifies that decoding the json reproduces the original value (according to its equatable conformance).
///
/// - parameter value: The value to encode/decode.
/// - parameter json: The expected json encoding.
public func checkCoding<T: Codable & Equatable>(
_ value: T,
json: String,
file: StaticString = #filePath,
line: UInt = #line
) {
let encoder = JSONEncoder()
encoder.outputFormatting.insert(.prettyPrinted)
encoder.outputFormatting.insert(.sortedKeys)
let data = try! encoder.encode(WrapFragment(value: value))
let wrappedStr = String(data: data, encoding: .utf8)!
/// Strip off WrapFragment encoding `{"value":}` and extra indentation.
let pre = "{\n \"value\" : "
let suff = "\n}"
XCTAssert(wrappedStr.hasPrefix(pre))
XCTAssert(wrappedStr.hasSuffix(suff))
let str = String(wrappedStr.dropFirst(pre.count).dropLast(suff.count))
// Remove extra indentation
.replacingOccurrences(of: "\n ", with: "\n")
// Remove trailing whitespace to normalize between corelibs and Apple Foundation.
.trimmingTrailingWhitespace()
XCTAssertEqual(json, str, file: file, line: line)
let decoder = JSONDecoder()
let decodedValue = try! decoder.decode(WrapFragment<T>.self, from: data).value
XCTAssertEqual(value, decodedValue, file: file, line: line)
}
/// JSONEncoder requires the top-level value to be encoded as a JSON container (array or object). Give it one.
private struct WrapFragment<T>: Equatable, Codable where T: Equatable & Codable {
var value: T
}
/// Checks that decoding the given string is equal to the expected value.
///
/// - parameter value: The value to encode/decode.
/// - parameter json: The expected json encoding.
public func checkDecoding<T: Codable & Equatable>(
json: String,
expected value: T,
file: StaticString = #filePath,
line: UInt = #line
) {
let wrappedStr = "{\"value\":\(json)}"
let data = wrappedStr.data(using: .utf8)!
let decoder = JSONDecoder()
let decodedValue = try! decoder.decode(WrapFragment<T>.self, from: data).value
XCTAssertEqual(value, decodedValue, file: file, line: line)
}
public func checkCoding<T>(
_ value: T,
json: String,
userInfo: [CodingUserInfoKey: Any] = [:],
file: StaticString = #filePath,
line: UInt = #line,
body: (T) -> Void
) where T: Codable {
let encoder = JSONEncoder()
encoder.outputFormatting.insert(.prettyPrinted)
encoder.outputFormatting.insert(.sortedKeys)
let data = try! encoder.encode(value)
let str = String(data: data, encoding: .utf8)!
// Remove trailing whitespace to normalize between corelibs and Apple Foundation.
.trimmingTrailingWhitespace()
XCTAssertEqual(json, str, file: file, line: line)
let decoder = JSONDecoder()
decoder.userInfo = userInfo
let decodedValue = try! decoder.decode(T.self, from: data)
body(decodedValue)
}
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