objectivec/Tests/GPBSwiftTests.swift

// Protocol Buffers - Google's data interchange format
// Copyright 2015 Google Inc.  All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd

import Foundation
import XCTest
// This works for the Xcode project, but for any other build that gets the tests wired up
// it will need something else.
import ProtocolBuffers

// Test some usage of the ObjC library from Swift.

private func dataFromStr(_ str: String) -> Data {
  return str.data(using: .utf8)!
}

class GPBBridgeTests: XCTestCase {

  func testProto2Basics() {
    let msg = Message2()
    let msg2 = Message2()
    let msg3 = Message2_OptionalGroup()

    msg.optionalInt32 = 100
    msg.optionalString = "abc"
    msg.optionalEnum = .bar
    msg2.optionalString = "other"
    msg.optional = msg2
    msg3.a = 200
    msg.optionalGroup = msg3
    msg.repeatedInt32Array.addValue(300)
    msg.repeatedInt32Array.addValue(301)
    msg.repeatedStringArray.add("mno")
    msg.repeatedStringArray.add("pqr")
    msg.repeatedEnumArray.addValue(Message2_Enum.bar.rawValue)
    msg.repeatedEnumArray.addValue(Message2_Enum.baz.rawValue)
    msg.mapInt32Int32.setInt32(400, forKey: 500)
    msg.mapInt32Int32.setInt32(401, forKey: 501)
    msg.mapStringString.setObject("foo", forKey: "bar" as NSString)
    msg.mapStringString.setObject("abc", forKey: "xyz" as NSString)
    msg.mapInt32Enum.setEnum(Message2_Enum.bar.rawValue, forKey: 600)
    msg.mapInt32Enum.setEnum(Message2_Enum.baz.rawValue, forKey: 601)

    // Check has*.
    XCTAssertTrue(msg.hasOptionalInt32)
    XCTAssertTrue(msg.hasOptionalString)
    XCTAssertTrue(msg.hasOptionalEnum)
    XCTAssertTrue(msg2.hasOptionalString)
    XCTAssertTrue(msg.hasOptionalMessage)
    XCTAssertTrue(msg3.hasA)
    XCTAssertTrue(msg.hasOptionalGroup)
    XCTAssertFalse(msg.hasOptionalInt64)
    XCTAssertFalse(msg.hasOptionalFloat)

    // Check values.
    XCTAssertEqual(msg.optionalInt32, Int32(100))
    XCTAssertEqual(msg.optionalString, "abc")
    XCTAssertEqual(msg2.optionalString, "other")
    XCTAssertTrue(msg.optional === msg2)
    XCTAssertEqual(msg.optionalEnum, Message2_Enum.bar)
    XCTAssertEqual(msg3.a, Int32(200))
    XCTAssertTrue(msg.optionalGroup === msg3)
    XCTAssertEqual(msg.repeatedInt32Array.count, UInt(2))
    XCTAssertEqual(msg.repeatedInt32Array.value(at: 0), Int32(300))
    XCTAssertEqual(msg.repeatedInt32Array.value(at: 1), Int32(301))
    XCTAssertEqual(msg.repeatedStringArray.count, Int(2))
    XCTAssertEqual(msg.repeatedStringArray.object(at: 0) as? String, "mno")
    XCTAssertEqual(msg.repeatedStringArray.object(at: 1) as? String, "pqr")
    XCTAssertEqual(msg.repeatedEnumArray.count, UInt(2))
    XCTAssertEqual(msg.repeatedEnumArray.value(at: 0), Message2_Enum.bar.rawValue)
    XCTAssertEqual(msg.repeatedEnumArray.value(at: 1), Message2_Enum.baz.rawValue)
    XCTAssertEqual(msg.repeatedInt64Array.count, UInt(0))
    XCTAssertEqual(msg.mapInt32Int32.count, UInt(2))
    var intValue: Int32 = 0
    XCTAssertTrue(msg.mapInt32Int32.getInt32(&intValue, forKey: 500))
    XCTAssertEqual(intValue, Int32(400))
    XCTAssertTrue(msg.mapInt32Int32.getInt32(&intValue, forKey: 501))
    XCTAssertEqual(intValue, Int32(401))
    XCTAssertEqual(msg.mapStringString.count, Int(2))
    XCTAssertEqual(msg.mapStringString.object(forKey: "bar") as? String, "foo")
    XCTAssertEqual(msg.mapStringString.object(forKey: "xyz") as? String, "abc")
    XCTAssertEqual(msg.mapInt32Enum.count, UInt(2))
    XCTAssertTrue(msg.mapInt32Enum.getEnum(&intValue, forKey: 600))
    XCTAssertEqual(intValue, Message2_Enum.bar.rawValue)
    XCTAssertTrue(msg.mapInt32Enum.getEnum(&intValue, forKey: 601))
    XCTAssertEqual(intValue, Message2_Enum.baz.rawValue)

    // Clearing a string with nil.
    msg2.optionalString = nil
    XCTAssertFalse(msg2.hasOptionalString)
    XCTAssertEqual(msg2.optionalString, "")

    // Clearing a message with nil.
    msg.optionalGroup = nil
    XCTAssertFalse(msg.hasOptionalGroup)
    XCTAssertTrue(msg.optionalGroup !== msg3)  // New instance

    // Clear.
    msg.clear()
    XCTAssertFalse(msg.hasOptionalInt32)
    XCTAssertFalse(msg.hasOptionalString)
    XCTAssertFalse(msg.hasOptionalEnum)
    XCTAssertFalse(msg.hasOptionalMessage)
    XCTAssertFalse(msg.hasOptionalInt64)
    XCTAssertFalse(msg.hasOptionalFloat)
    XCTAssertEqual(msg.optionalInt32, Int32(0))
    XCTAssertEqual(msg.optionalString, "")
    XCTAssertTrue(msg.optional !== msg2)  // New instance
    XCTAssertEqual(msg.optionalEnum, Message2_Enum.foo)  // Default
    XCTAssertEqual(msg.repeatedInt32Array.count, UInt(0))
    XCTAssertEqual(msg.repeatedStringArray.count, Int(0))
    XCTAssertEqual(msg.repeatedEnumArray.count, UInt(0))
    XCTAssertEqual(msg.mapInt32Int32.count, UInt(0))
    XCTAssertEqual(msg.mapStringString.count, Int(0))
    XCTAssertEqual(msg.mapInt32Enum.count, UInt(0))
  }

  func testProto3Basics() {
    let msg = Message3()
    let msg2 = Message3()

    msg.optionalInt32 = 100
    msg.optionalString = "abc"
    msg.optionalEnum = .bar
    msg2.optionalString = "other"
    msg.optional = msg2
    msg.repeatedInt32Array.addValue(300)
    msg.repeatedInt32Array.addValue(301)
    msg.repeatedStringArray.add("mno")
    msg.repeatedStringArray.add("pqr")
    // "proto3" syntax lets enum get unknown values.
    msg.repeatedEnumArray.addValue(Message3_Enum.bar.rawValue)
    msg.repeatedEnumArray.addRawValue(666)
    SetMessage3_OptionalEnum_RawValue(msg2, 666)
    msg.mapInt32Int32.setInt32(400, forKey: 500)
    msg.mapInt32Int32.setInt32(401, forKey: 501)
    msg.mapStringString.setObject("foo", forKey: "bar" as NSString)
    msg.mapStringString.setObject("abc", forKey: "xyz" as NSString)
    msg.mapInt32Enum.setEnum(Message2_Enum.bar.rawValue, forKey: 600)
    // "proto3" syntax lets enum get unknown values.
    msg.mapInt32Enum.setRawValue(666, forKey: 601)

    // Has only exists on for message fields.
    XCTAssertTrue(msg.hasOptionalMessage)
    XCTAssertFalse(msg2.hasOptionalMessage)

    // Check values.
    XCTAssertEqual(msg.optionalInt32, Int32(100))
    XCTAssertEqual(msg.optionalString, "abc")
    XCTAssertEqual(msg2.optionalString, "other")
    XCTAssertTrue(msg.optional === msg2)
    XCTAssertEqual(msg.optionalEnum, Message3_Enum.bar)
    XCTAssertEqual(msg.repeatedInt32Array.count, UInt(2))
    XCTAssertEqual(msg.repeatedInt32Array.value(at: 0), Int32(300))
    XCTAssertEqual(msg.repeatedInt32Array.value(at: 1), Int32(301))
    XCTAssertEqual(msg.repeatedStringArray.count, Int(2))
    XCTAssertEqual(msg.repeatedStringArray.object(at: 0) as? String, "mno")
    XCTAssertEqual(msg.repeatedStringArray.object(at: 1) as? String, "pqr")
    XCTAssertEqual(msg.repeatedInt64Array.count, UInt(0))
    XCTAssertEqual(msg.repeatedEnumArray.count, UInt(2))
    XCTAssertEqual(msg.repeatedEnumArray.value(at: 0), Message3_Enum.bar.rawValue)
    XCTAssertEqual(
      msg.repeatedEnumArray.value(at: 1), Message3_Enum.gpbUnrecognizedEnumeratorValue.rawValue)
    XCTAssertEqual(msg.repeatedEnumArray.rawValue(at: 1), 666)
    XCTAssertEqual(msg2.optionalEnum, Message3_Enum.gpbUnrecognizedEnumeratorValue)
    XCTAssertEqual(Message3_OptionalEnum_RawValue(msg2), Int32(666))
    XCTAssertEqual(msg.mapInt32Int32.count, UInt(2))
    var intValue: Int32 = 0
    XCTAssertTrue(msg.mapInt32Int32.getInt32(&intValue, forKey: 500))
    XCTAssertEqual(intValue, Int32(400))
    XCTAssertTrue(msg.mapInt32Int32.getInt32(&intValue, forKey: 501))
    XCTAssertEqual(intValue, Int32(401))
    XCTAssertEqual(msg.mapStringString.count, Int(2))
    XCTAssertEqual(msg.mapStringString.object(forKey: "bar") as? String, "foo")
    XCTAssertEqual(msg.mapStringString.object(forKey: "xyz") as? String, "abc")
    XCTAssertEqual(msg.mapInt32Enum.count, UInt(2))
    XCTAssertTrue(msg.mapInt32Enum.getEnum(&intValue, forKey: 600))
    XCTAssertEqual(intValue, Message2_Enum.bar.rawValue)
    XCTAssertTrue(msg.mapInt32Enum.getEnum(&intValue, forKey: 601))
    XCTAssertEqual(intValue, Message3_Enum.gpbUnrecognizedEnumeratorValue.rawValue)
    XCTAssertTrue(msg.mapInt32Enum.getRawValue(&intValue, forKey: 601))
    XCTAssertEqual(intValue, 666)

    // Clearing a string with nil.
    msg2.optionalString = nil
    XCTAssertEqual(msg2.optionalString, "")

    // Clearing a message with nil.
    msg.optional = nil
    XCTAssertFalse(msg.hasOptionalMessage)
    XCTAssertTrue(msg.optional !== msg2)  // New instance

    // Clear.
    msg.clear()
    XCTAssertFalse(msg.hasOptionalMessage)
    XCTAssertEqual(msg.optionalInt32, Int32(0))
    XCTAssertEqual(msg.optionalString, "")
    XCTAssertTrue(msg.optional !== msg2)  // New instance
    XCTAssertEqual(msg.optionalEnum, Message3_Enum.foo)  // Default
    XCTAssertEqual(msg.repeatedInt32Array.count, UInt(0))
    XCTAssertEqual(msg.repeatedStringArray.count, Int(0))
    XCTAssertEqual(msg.repeatedEnumArray.count, UInt(0))
    msg2.clear()
    XCTAssertEqual(msg2.optionalEnum, Message3_Enum.foo)  // Default
    XCTAssertEqual(Message3_OptionalEnum_RawValue(msg2), Message3_Enum.foo.rawValue)
    XCTAssertEqual(msg.mapInt32Int32.count, UInt(0))
    XCTAssertEqual(msg.mapStringString.count, Int(0))
    XCTAssertEqual(msg.mapInt32Enum.count, UInt(0))
  }

  func testAutoCreation() {
    let msg = Message2()

    XCTAssertFalse(msg.hasOptionalGroup)
    XCTAssertFalse(msg.hasOptionalMessage)

    // Access shouldn't result in has* but should return objects.
    let msg2 = msg.optionalGroup
    let msg3 = msg.optional.optional
    let msg4 = msg.optional
    XCTAssertNotNil(msg2)
    XCTAssertNotNil(msg3)
    XCTAssertFalse(msg.hasOptionalGroup)
    XCTAssertFalse(msg.optional.hasOptionalMessage)
    XCTAssertFalse(msg.hasOptionalMessage)

    // Setting things should trigger has* getting set.
    msg.optionalGroup.a = 10
    msg.optional.optional.optionalInt32 = 100
    XCTAssertTrue(msg.hasOptionalGroup)
    XCTAssertTrue(msg.optional.hasOptionalMessage)
    XCTAssertTrue(msg.hasOptionalMessage)

    // And they should be the same pointer as before.
    XCTAssertTrue(msg2 === msg.optionalGroup)
    XCTAssertTrue(msg3 === msg.optional.optional)
    XCTAssertTrue(msg4 === msg.optional)

    // Clear gets us new objects next time around.
    msg.clear()
    XCTAssertFalse(msg.hasOptionalGroup)
    XCTAssertFalse(msg.optional.hasOptionalMessage)
    XCTAssertFalse(msg.hasOptionalMessage)
    msg.optionalGroup.a = 20
    msg.optional.optional.optionalInt32 = 200
    XCTAssertTrue(msg.hasOptionalGroup)
    XCTAssertTrue(msg.optional.hasOptionalMessage)
    XCTAssertTrue(msg.hasOptionalMessage)
    XCTAssertTrue(msg2 !== msg.optionalGroup)
    XCTAssertTrue(msg3 !== msg.optional.optional)
    XCTAssertTrue(msg4 !== msg.optional)

    // Explicit set of a message, means autocreated object doesn't bind.
    msg.clear()
    let autoCreated = msg.optional
    XCTAssertFalse(msg.hasOptionalMessage)
    let msg5 = Message2()
    msg5.optionalInt32 = 123
    msg.optional = msg5
    XCTAssertTrue(msg.hasOptionalMessage)
    // Modifying the autocreated doesn't replaced the explicit set one.
    autoCreated?.optionalInt32 = 456
    XCTAssertTrue(msg.hasOptionalMessage)
    XCTAssertTrue(msg.optional === msg5)
    XCTAssertEqual(msg.optional.optionalInt32, Int32(123))
  }

  func testProto2OneOfSupport() {
    let msg = Message2()

    XCTAssertEqual(msg.oOneOfCase, Message2_O_OneOfCase.gpbUnsetOneOfCase)
    XCTAssertEqual(msg.oneofInt32, Int32(100))  // Default
    XCTAssertEqual(msg.oneofFloat, Float(110.0))  // Default
    XCTAssertEqual(msg.oneofEnum, Message2_Enum.baz)  // Default
    let autoCreated = msg.oneof  // Default create one.
    XCTAssertNotNil(autoCreated)
    XCTAssertEqual(msg.oOneOfCase, Message2_O_OneOfCase.gpbUnsetOneOfCase)

    msg.oneofInt32 = 10
    XCTAssertEqual(msg.oneofInt32, Int32(10))
    XCTAssertEqual(msg.oneofFloat, Float(110.0))  // Default
    XCTAssertEqual(msg.oneofEnum, Message2_Enum.baz)  // Default
    XCTAssertTrue(msg.oneof === autoCreated)  // Still the same
    XCTAssertEqual(msg.oOneOfCase, Message2_O_OneOfCase.oneofInt32)

    msg.oneofFloat = 20.0
    XCTAssertEqual(msg.oneofInt32, Int32(100))  // Default
    XCTAssertEqual(msg.oneofFloat, Float(20.0))
    XCTAssertEqual(msg.oneofEnum, Message2_Enum.baz)  // Default
    XCTAssertTrue(msg.oneof === autoCreated)  // Still the same
    XCTAssertEqual(msg.oOneOfCase, Message2_O_OneOfCase.oneofFloat)

    msg.oneofEnum = .bar
    XCTAssertEqual(msg.oneofInt32, Int32(100))  // Default
    XCTAssertEqual(msg.oneofFloat, Float(110.0))  // Default
    XCTAssertEqual(msg.oneofEnum, Message2_Enum.bar)
    XCTAssertTrue(msg.oneof === autoCreated)  // Still the same
    XCTAssertEqual(msg.oOneOfCase, Message2_O_OneOfCase.oneofEnum)

    // Sets via the autocreated instance.
    msg.oneof.optionalInt32 = 200
    XCTAssertEqual(msg.oneofInt32, Int32(100))  // Default
    XCTAssertEqual(msg.oneofFloat, Float(110.0))  // Default
    XCTAssertEqual(msg.oneofEnum, Message2_Enum.baz)  // Default
    XCTAssertTrue(msg.oneof === autoCreated)  // Still the same
    XCTAssertEqual(msg.oneof.optionalInt32, Int32(200))
    XCTAssertEqual(msg.oOneOfCase, Message2_O_OneOfCase.oneofMessage)

    // Clear the oneof.
    Message2_ClearOOneOfCase(msg)
    XCTAssertEqual(msg.oneofInt32, Int32(100))  // Default
    XCTAssertEqual(msg.oneofFloat, Float(110.0))  // Default
    XCTAssertEqual(msg.oneofEnum, Message2_Enum.baz)  // Default
    let autoCreated2 = msg.oneof  // Default create one
    XCTAssertNotNil(autoCreated2)
    XCTAssertTrue(autoCreated2 !== autoCreated)  // New instance
    XCTAssertEqual(msg.oneof.optionalInt32, Int32(0))  // Default
    XCTAssertEqual(msg.oOneOfCase, Message2_O_OneOfCase.gpbUnsetOneOfCase)

    msg.oneofInt32 = 10
    XCTAssertEqual(msg.oneofInt32, Int32(10))
    XCTAssertEqual(msg.oOneOfCase, Message2_O_OneOfCase.oneofInt32)

    // Confirm Message.clear() handles the oneof correctly.
    msg.clear()
    XCTAssertEqual(msg.oneofInt32, Int32(100))  // Default
    XCTAssertEqual(msg.oOneOfCase, Message2_O_OneOfCase.gpbUnsetOneOfCase)

    // Sets via the autocreated instance.
    msg.oneof.optionalInt32 = 300
    XCTAssertTrue(msg.oneof !== autoCreated)  // New instance
    XCTAssertTrue(msg.oneof !== autoCreated2)  // New instance
    XCTAssertEqual(msg.oneof.optionalInt32, Int32(300))
    XCTAssertEqual(msg.oOneOfCase, Message2_O_OneOfCase.oneofMessage)

    // Set message to nil clears the oneof.
    msg.oneof = nil
    XCTAssertEqual(msg.oneof.optionalInt32, Int32(0))  // Default
    XCTAssertEqual(msg.oOneOfCase, Message2_O_OneOfCase.gpbUnsetOneOfCase)
  }

  func testProto3OneOfSupport() {
    let msg = Message3()

    XCTAssertEqual(msg.oOneOfCase, Message3_O_OneOfCase.gpbUnsetOneOfCase)
    XCTAssertEqual(msg.oneofInt32, Int32(0))  // Default
    XCTAssertEqual(msg.oneofFloat, Float(0.0))  // Default
    XCTAssertEqual(msg.oneofEnum, Message3_Enum.foo)  // Default
    let autoCreated = msg.oneof  // Default create one.
    XCTAssertNotNil(autoCreated)
    XCTAssertEqual(msg.oOneOfCase, Message3_O_OneOfCase.gpbUnsetOneOfCase)

    msg.oneofInt32 = 10
    XCTAssertEqual(msg.oneofInt32, Int32(10))
    XCTAssertEqual(msg.oneofFloat, Float(0.0))  // Default
    XCTAssertEqual(msg.oneofEnum, Message3_Enum.foo)  // Default
    XCTAssertTrue(msg.oneof === autoCreated)  // Still the same
    XCTAssertEqual(msg.oOneOfCase, Message3_O_OneOfCase.oneofInt32)

    msg.oneofFloat = 20.0
    XCTAssertEqual(msg.oneofInt32, Int32(0))  // Default
    XCTAssertEqual(msg.oneofFloat, Float(20.0))
    XCTAssertEqual(msg.oneofEnum, Message3_Enum.foo)  // Default
    XCTAssertTrue(msg.oneof === autoCreated)  // Still the same
    XCTAssertEqual(msg.oOneOfCase, Message3_O_OneOfCase.oneofFloat)

    msg.oneofEnum = .bar
    XCTAssertEqual(msg.oneofInt32, Int32(0))  // Default
    XCTAssertEqual(msg.oneofFloat, Float(0.0))  // Default
    XCTAssertEqual(msg.oneofEnum, Message3_Enum.bar)
    XCTAssertTrue(msg.oneof === autoCreated)  // Still the same
    XCTAssertEqual(msg.oOneOfCase, Message3_O_OneOfCase.oneofEnum)

    // Sets via the autocreated instance.
    msg.oneof.optionalInt32 = 200
    XCTAssertEqual(msg.oneofInt32, Int32(0))  // Default
    XCTAssertEqual(msg.oneofFloat, Float(0.0))  // Default
    XCTAssertEqual(msg.oneofEnum, Message3_Enum.foo)  // Default
    XCTAssertTrue(msg.oneof === autoCreated)  // Still the same
    XCTAssertEqual(msg.oneof.optionalInt32, Int32(200))
    XCTAssertEqual(msg.oOneOfCase, Message3_O_OneOfCase.oneofMessage)

    // Clear the oneof.
    Message3_ClearOOneOfCase(msg)
    XCTAssertEqual(msg.oneofInt32, Int32(0))  // Default
    XCTAssertEqual(msg.oneofFloat, Float(0.0))  // Default
    XCTAssertEqual(msg.oneofEnum, Message3_Enum.foo)  // Default
    let autoCreated2 = msg.oneof  // Default create one
    XCTAssertNotNil(autoCreated2)
    XCTAssertTrue(autoCreated2 !== autoCreated)  // New instance
    XCTAssertEqual(msg.oneof.optionalInt32, Int32(0))  // Default
    XCTAssertEqual(msg.oOneOfCase, Message3_O_OneOfCase.gpbUnsetOneOfCase)

    msg.oneofInt32 = 10
    XCTAssertEqual(msg.oneofInt32, Int32(10))
    XCTAssertEqual(msg.oOneOfCase, Message3_O_OneOfCase.oneofInt32)

    // Confirm Message.clear() handles the oneof correctly.
    msg.clear()
    XCTAssertEqual(msg.oneofInt32, Int32(0))  // Default
    XCTAssertEqual(msg.oOneOfCase, Message3_O_OneOfCase.gpbUnsetOneOfCase)

    // Sets via the autocreated instance.
    msg.oneof.optionalInt32 = 300
    XCTAssertTrue(msg.oneof !== autoCreated)  // New instance
    XCTAssertTrue(msg.oneof !== autoCreated2)  // New instance
    XCTAssertEqual(msg.oneof.optionalInt32, Int32(300))
    XCTAssertEqual(msg.oOneOfCase, Message3_O_OneOfCase.oneofMessage)

    // Set message to nil clears the oneof.
    msg.oneof = nil
    XCTAssertEqual(msg.oneof.optionalInt32, Int32(0))  // Default
    XCTAssertEqual(msg.oOneOfCase, Message3_O_OneOfCase.gpbUnsetOneOfCase)
  }

  func testSerialization() {
    let msg = Message2()

    msg.optionalInt32 = 100
    msg.optionalInt64 = 101
    msg.optionalGroup.a = 102
    msg.repeatedStringArray.add("abc")
    msg.repeatedStringArray.add("def")
    msg.mapInt32Int32.setInt32(200, forKey: 300)
    msg.mapInt32Int32.setInt32(201, forKey: 201)
    msg.mapStringString.setObject("foo", forKey: "bar" as NSString)
    msg.mapStringString.setObject("abc", forKey: "xyz" as NSString)

    let data = msg.data()

    let msg2 = try! Message2(data: data!)
    XCTAssertTrue(msg2 !== msg)  // New instance
    XCTAssertEqual(msg.optionalInt32, Int32(100))
    XCTAssertEqual(msg.optionalInt64, Int64(101))
    XCTAssertEqual(msg.optionalGroup.a, Int32(102))
    XCTAssertEqual(msg.repeatedStringArray.count, Int(2))
    XCTAssertEqual(msg.mapInt32Int32.count, UInt(2))
    XCTAssertEqual(msg.mapStringString.count, Int(2))
    XCTAssertEqual(msg2, msg)
  }

  func testUnknownFieldsAdditions_getToOptional() {
    let ufs = GPBUnknownFields()
    ufs.addFieldNumber(1, varint: 1)
    ufs.addFieldNumber(1, varint: 2)
    ufs.addFieldNumber(1, fixed32: 3)
    ufs.addFieldNumber(1, fixed32: 4)
    ufs.addFieldNumber(1, fixed64: 5)
    ufs.addFieldNumber(1, fixed64: 6)
    ufs.addFieldNumber(1, lengthDelimited: dataFromStr("foo"))
    ufs.addFieldNumber(1, lengthDelimited: dataFromStr("bar"))
    let group1 = ufs.addGroup(withFieldNumber: 1)
    let group2 = ufs.addGroup(withFieldNumber: 1)
    XCTAssertFalse(group1 === group2)  // Different objects
    XCTAssertEqual(ufs.count, 10)

    ufs.addFieldNumber(11, varint: 11)
    ufs.addFieldNumber(12, fixed32: 12)
    ufs.addFieldNumber(13, fixed64: 13)
    ufs.addFieldNumber(14, lengthDelimited: dataFromStr("foo2"))
    let group3 = ufs.addGroup(withFieldNumber: 15)
    XCTAssertNotNil(group3)
    XCTAssertFalse(group3 === group1)  // Different objects
    XCTAssertFalse(group3 === group2)  // Different objects
    XCTAssertEqual(ufs.count, 15)

    XCTAssertEqual(ufs.firstVarint(1), 1)
    XCTAssertEqual(ufs.firstVarint(11), 11)
    XCTAssertNil(ufs.firstVarint(12))  // Different type
    XCTAssertNil(ufs.firstVarint(99))  // Not present

    XCTAssertEqual(ufs.firstFixed32(1), 3)
    XCTAssertEqual(ufs.firstFixed32(12), 12)
    XCTAssertNil(ufs.firstFixed32(11))  // Different type
    XCTAssertNil(ufs.firstFixed32(99))  // Not present

    XCTAssertEqual(ufs.firstFixed64(1), 5)
    XCTAssertEqual(ufs.firstFixed64(13), 13)
    XCTAssertNil(ufs.firstFixed64(11))  // Different type
    XCTAssertNil(ufs.firstFixed64(99))  // Not present

    XCTAssertEqual(dataFromStr("foo"), ufs.firstLengthDelimited(1))
    XCTAssertEqual(dataFromStr("foo2"), ufs.firstLengthDelimited(14))
    XCTAssertNil(ufs.firstLengthDelimited(11))  // Different type
    XCTAssertNil(ufs.firstLengthDelimited(99))  // Not present

    XCTAssertTrue(group1 === ufs.firstGroup(1))  // Testing ptr, exact object
    XCTAssertTrue(group3 === ufs.firstGroup(15))  // Testing ptr, exact object
    XCTAssertNil(ufs.firstGroup(11))  // Different type
    XCTAssertNil(ufs.firstGroup(99))  // Not present
  }

  // This also test the `NSFastEnumeration` -> `Sequence` support.
  func testUnknownFieldAdditions_value() {
    let ufs = GPBUnknownFields()
    ufs.addFieldNumber(1, varint: 1)
    ufs.addFieldNumber(2, varint: 2)
    ufs.addFieldNumber(1, fixed32: 3)
    ufs.addFieldNumber(2, fixed32: 4)
    ufs.addFieldNumber(1, fixed64: 5)
    ufs.addFieldNumber(3, fixed64: 6)
    ufs.addFieldNumber(1, lengthDelimited: dataFromStr("foo"))
    ufs.addFieldNumber(2, lengthDelimited: dataFromStr("bar"))
    let group1 = ufs.addGroup(withFieldNumber: 1)
    group1.addFieldNumber(10, varint: 1)
    let group2 = ufs.addGroup(withFieldNumber: 3)
    group2.addFieldNumber(10, varint: 2)

    // The order added nothing to do with field numbers.
    var loop = 0
    for field in ufs {
      loop += 1
      switch loop {
      case 1:
        XCTAssertEqual(field.number, 1)
        XCTAssertEqual(field.value, GPBUnknownField.Value.varint(1))
      case 2:
        XCTAssertEqual(field.number, 2)
        XCTAssertEqual(field.value, .varint(2))
      case 3:
        XCTAssertEqual(field.number, 1)
        XCTAssertEqual(field.value, .fixed32(3))
      case 4:
        XCTAssertEqual(field.number, 2)
        XCTAssertEqual(field.value, .fixed32(4))
      case 5:
        XCTAssertEqual(field.number, 1)
        XCTAssertEqual(field.value, .fixed64(5))
      case 6:
        XCTAssertEqual(field.number, 3)
        XCTAssertEqual(field.value, .fixed64(6))
      case 7:
        XCTAssertEqual(field.number, 1)
        XCTAssertEqual(field.value, .lengthDelimited(dataFromStr("foo")))
      case 8:
        XCTAssertEqual(field.number, 2)
        XCTAssertEqual(field.value, .lengthDelimited(dataFromStr("bar")))
      case 9:
        XCTAssertEqual(field.number, 1)
        XCTAssertEqual(field.value, .group(group1))
      case 10:
        XCTAssertEqual(field.number, 3)
        XCTAssertEqual(field.value, .group(group2))
      default:
        XCTFail("Unexpected")
      }
    }
    XCTAssertEqual(loop, 10)
  }

}