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Add BindingTests #33

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Feb 1, 2024
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Add BindingTests #33

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263 changes: 263 additions & 0 deletions Tests/OpenSwiftUITests/DataAndStorage/ModelData/Binding/BindingTests.swift
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Original file line number Diff line number Diff line change
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//
// BindingTests.swift
//
//
// Created by Kyle on 2024/2/1.
//

@testable import OpenSwiftUI
import Testing

struct BindingTests {
@Test("Test Binding.init(get:set:)")
func initWithGetterSetter() {
var storage = 0
let binding = Binding {
storage
} set: { newValue in
storage = newValue
}
#expect(binding.wrappedValue == 0)

let newValue = 10
binding.wrappedValue = newValue
#expect(binding.wrappedValue == newValue)
#expect(storage == newValue)
}

@Test("Test Binding.init(get:set:) with transaction")
func initWithGetterSetterWithTransaction() {
var storage = 0
var transaction = Transaction(animation: .default)

let binding = Binding {
storage
} set: { newValue, newTransaction in
storage = newValue
transaction = newTransaction
}

#expect(binding.wrappedValue == 0)
#expect(storage == 0)
#expect(transaction.animation == .default)

binding.wrappedValue = 10
#expect(binding.wrappedValue == 10)
#expect(storage == 10)
#expect(transaction.animation == nil)
}

@Test("Test Binding.constant")
func initWithConstantValue() {
let binding = Binding.constant(0)
#expect(binding.location.wasRead == true)
binding.location.wasRead = false
#expect(binding.location.wasRead == true)
binding.wrappedValue = 5
#expect(binding.wrappedValue == 0)
}

@Test("Test Binding's projectedValue")
func bindingProjectingValue() {
struct T {
var name: String
}

let binding = Binding.constant(T(name: "test"))
#expect(binding.location === binding.projectedValue.location)

let newBinding = Binding(projectedValue: binding)
#expect(binding.location === newBinding.location)

let nameBinding = binding.name
#expect(nameBinding.wrappedValue == "test")
}

@Test
func initBindingToOptionalBinding() {
var storage = 0
let baseBinding = Binding {
storage
} set: { newValue in
storage = newValue
}
#expect(baseBinding.wrappedValue == 0)

let optionalBinding: Binding<Int?> = Binding(baseBinding)
#expect(optionalBinding.wrappedValue == 0)

optionalBinding.wrappedValue = 10
#expect(optionalBinding.wrappedValue == 0)
storage = 20
#expect(optionalBinding.wrappedValue == 20)
optionalBinding.wrappedValue = nil
#expect(optionalBinding.wrappedValue == 20)
}

@Test("Test Binding.init?(_:)")
func initWithBindingOptionalValue() {
struct FunctionalLocationWithWasRead<Value>: Location {
var getValue: () -> Value
var setValue: (Value, Transaction) -> Void
var wasRead = false
func get() -> Value { getValue() }
func set(_ value: Value, transaction: Transaction) { setValue(value, transaction) }
}
class Wrapper {
var storage: Int?
}

let wrapper = Wrapper()
let location = LocationBox(location: FunctionalLocationWithWasRead(getValue: {
wrapper.storage
}, setValue: { newValue, _ in
wrapper.storage = newValue
}))

_ = {
wrapper.storage = nil
let baseBinding = Binding(value: location.get(), location: location)
#expect(baseBinding.location.wasRead == false)
#expect(GraphHost.isUpdating == false)

// _value: nil
// location.get(): nil
// GraphHost.isUpdating: false
// - location.get()
let binding1 = Binding(baseBinding)
#expect(binding1 == nil)

wrapper.storage = 0
// _value: nil
// location.get(): 0
// GraphHost.isUpdating: false
// - location.get()

// MARK: Expected a forceUnwrap failure.

// swift-testing is tracking it via https://github.com/apple/swift-testing/issues/157
// #expectCrash(Binding(baseBinding))

GraphHost.isUpdating = true
#expect(GraphHost.isUpdating == true)

wrapper.storage = nil
// _value: nil
// location.get(): nil
// GraphHost.isUpdating: true
// - wasRead & _value
let binding3 = Binding(baseBinding)
#expect(baseBinding.location.wasRead == true)
#expect(binding3 == nil)
baseBinding.location.wasRead = false
#expect(baseBinding.location.wasRead == false)

wrapper.storage = 0
// _value: nil
// location.get(): 0
// GraphHost.isUpdating: true
// - wasRead & _value
let binding4 = Binding(baseBinding)
#expect(baseBinding.location.wasRead == true)
#expect(binding4 == nil)
baseBinding.location.wasRead = false
#expect(baseBinding.location.wasRead == false)

GraphHost.isUpdating = false
#expect(GraphHost.isUpdating == false)
}()

_ = {
wrapper.storage = 0
let baseBinding = Binding(value: location.get(), location: location)
#expect(baseBinding.location.wasRead == false)
#expect(GraphHost.isUpdating == false)

// _value: 0
// location.get(): 0
// GraphHost.isUpdating: false
// - location.get()
let binding1 = Binding(baseBinding)
#expect(binding1 != nil)

wrapper.storage = nil
// _value: 0
// location.get(): nil
// GraphHost.isUpdating: false
// - location.get()
let binding2 = Binding(baseBinding)
#expect(binding2 == nil)

GraphHost.isUpdating = true
#expect(GraphHost.isUpdating == true)

wrapper.storage = 0
// _value: 0
// location.get(): 0
// GraphHost.isUpdating: true
// - wasRead & _value
let binding3 = Binding(baseBinding)
#expect(baseBinding.location.wasRead == true)
#expect(binding3 != nil)
baseBinding.location.wasRead = false
#expect(baseBinding.location.wasRead == false)

wrapper.storage = nil
// _value: 0
// location.get(): nil
// GraphHost.isUpdating: true
// - wasRead & _value
let binding4 = Binding(baseBinding)
#expect(baseBinding.location.wasRead == true)
#expect(binding4 != nil)
baseBinding.location.wasRead = false
#expect(baseBinding.location.wasRead == false)

GraphHost.isUpdating = false
#expect(GraphHost.isUpdating == false)
}()
}

@Test
func initToAnyHashableBinding() {
var storage = 0
let baseBinding = Binding {
storage
} set: { newValue in
storage = newValue
}
#expect(baseBinding.wrappedValue == 0)

let anyHashableBinding: Binding<AnyHashable> = Binding(baseBinding)
#expect(anyHashableBinding.wrappedValue == AnyHashable(0))
anyHashableBinding.wrappedValue = 10
#expect(anyHashableBinding.wrappedValue == AnyHashable(0))
storage = 20
#expect(anyHashableBinding.wrappedValue == AnyHashable(20))
// #expectCrash(optionalBinding.wrappedValue = 0.0)
}

@Test
func identifiableValue() {
struct Storage: Identifiable {
var id: Int

var bindableID: Int {
get { id }
set { id = newValue }
}

var name: String
}
var storage = Storage(id: 0, name: "")
let binding = Binding {
storage
} set: { newValue in
storage = newValue
}
#expect(type(of: binding.id) == Int.self)
#expect(type(of: binding.bindableID) == Binding<Int>.self)
#expect(type(of: binding.name) == Binding<String>.self)
#expect(binding.id == storage.id)
}
}
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