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//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2024 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 Swift project authors
//
@testable @_spi(ForToolsIntegrationOnly) import Testing
@Suite("Expression.Value Tests")
struct Expression_ValueTests {
@Test("Value reflecting a simple struct with one property")
func simpleStruct() throws {
struct Foo {
var x: Int = 123
}
let foo = Foo()
let value = Expression.Value(reflecting: foo)
let children = try #require(value.children)
try #require(children.count == 1)
let child = try #require(children.first)
#expect(child.label == "x")
#expect(child.typeInfo == TypeInfo(describing: Int.self))
#expect(String(describing: child) == "123")
#expect(child.children == nil)
}
@Test("Value reflecting an object with multiple non-cyclic references")
func multipleNonCyclicReferences() throws {
class C: CustomStringConvertible {
var one: C?
var two: C?
let description: String
init(description: String) {
self.description = description
}
}
let x = C(description: "x")
let y = C(description: "y")
x.one = y
x.two = y
let value = Expression.Value(reflecting: x)
let children = try #require(value.children)
try #require(children.count == 3)
let one = try #require(value.children?[0].children?.first)
#expect(String(describing: one) == "y")
let two = try #require(value.children?[1].children?.first)
#expect(String(describing: two) == "y")
}
@Test("Value reflecting an object with multiple cyclic references")
func multipleCyclicReferences() throws {
class C: CustomStringConvertible {
var one: C?
weak var two: C?
let description: String
init(description: String) {
self.description = description
}
}
let x = C(description: "x")
let y = C(description: "y")
x.one = y
x.two = y
y.two = x
let value = Expression.Value(reflecting: x)
let children = try #require(value.children)
try #require(children.count == 3)
do {
let one = try #require(value.children?[0].children?.first)
#expect(String(describing: one) == "y")
let oneChildren = try #require(one.children)
try #require(oneChildren.count == 3)
try #require(oneChildren[1].label == "two")
let childlessX = try #require(oneChildren[1].children?.first)
#expect(String(describing: childlessX) == "x")
}
do {
let two = try #require(value.children?[1].children?.first)
#expect(String(describing: two) == "y")
let twoChildren = try #require(two.children)
try #require(twoChildren.count == 3)
try #require(twoChildren[1].label == "two")
let childlessX = try #require(twoChildren[1].children?.first)
#expect(String(describing: childlessX) == "x")
}
}
@Test("Value reflecting an object with a cyclic reference to itself")
func recursiveObjectReference() throws {
class RecursiveItem {
weak var anotherItem: RecursiveItem?
let boolValue = false
}
let recursiveItem = RecursiveItem()
recursiveItem.anotherItem = recursiveItem
let value = Expression.Value(reflecting: recursiveItem)
let children = try #require(value.children)
try #require(children.count == 2)
let firstChild = try #require(children.first)
#expect(firstChild.label == "anotherItem")
let lastChild = try #require(children.last)
#expect(lastChild.label == "boolValue")
#expect(String(describing: lastChild) == "false")
}
@Test("Value reflecting an object with a reference to another object which has a cyclic back-reference the first")
func cyclicBackReference() throws {
class One {
var two: Two?
}
class Two {
weak var one: One?
}
let one = One()
let two = Two()
one.two = two
two.one = one
let value = Expression.Value(reflecting: one)
let children = try #require(value.children)
try #require(children.count == 1)
let twoChild = try #require(children.first)
#expect(twoChild.label == "two")
#expect(twoChild.typeInfo == TypeInfo(describing: Two?.self))
let twoChildChildren = try #require(twoChild.children)
try #require(twoChildChildren.count == 1)
let twoChildChildrenOptionalChild = try #require(twoChildChildren.first)
#expect(twoChildChildrenOptionalChild.label == "some")
let twoChildChildrenOptionalChildren = try #require(twoChildChildrenOptionalChild.children)
try #require(twoChildChildrenOptionalChildren.count == 1)
let oneChild = try #require(twoChildChildrenOptionalChildren.first)
#expect(oneChild.label == "one")
#expect(oneChild.typeInfo == TypeInfo(describing: One?.self))
let oneChildChildren = try #require(oneChild.children)
try #require(oneChildChildren.count == 1)
let oneChildChildrenOptionalChild = try #require(oneChildChildren.first)
#expect(oneChildChildrenOptionalChild.label == "some")
#expect(oneChildChildrenOptionalChild.children == nil)
}
}
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