[Libraries] Dependency #6

Merged
javier merged 5 commits from libraries/dependency into main 2023-04-11 00:41:08 +00:00
7 changed files with 260 additions and 1 deletions

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@ -11,7 +11,9 @@ let package = Package(
.library(
name: "Libraries",
targets: [
"Locations"
"Dependency",
"Locations",
"Persistence"
]
),
],
@ -21,6 +23,10 @@ let package = Package(
name: "APICore",
dependencies: []
),
.target(
name: "Dependency",
dependencies: []
),
.target(
name: "Locations",
dependencies: [
@ -37,6 +43,12 @@ let package = Package(
"APICore"
]
),
.testTarget(
name: "DependencyTests",
dependencies: [
"Dependency"
]
),
.testTarget(
name: "LocationsTests",
dependencies: [

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@ -0,0 +1,31 @@
//
// Dependency.swift
// Dependency
//
// Created by Javier Cicchelli on 11/04/2023.
// Copyright © 2023 Röck+Cöde. All rights reserved.
//
/// This property wrapper provides a direct connection to the `DependencyService` service.
@propertyWrapper
public struct Dependency<D> {
// MARK: Properties
private let keyPath: WritableKeyPath<DependencyService, D>
/// This property allows direct read/write access to a defined dependency attached to a selected key path.
public var wrappedValue: D {
get { DependencyService[keyPath] }
set { DependencyService[keyPath] = newValue }
}
// MARK: Initialisers
/// Initialise the property wrapper by setting a key path to a defined dependency.
/// - Parameter keyPath: A key path to a defined dependency in the `DependencyService` service.
public init(_ keyPath: WritableKeyPath<DependencyService, D>) {
self.keyPath = keyPath
}
}

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@ -0,0 +1,22 @@
//
// DependencyKey.swift
// Dependency
//
// Created by Javier Cicchelli on 11/04/2023.
// Copyright © 2023 Röck+Cöde. All rights reserved.
//
/// This protocol defines a key to use in the dependency service.
public protocol DependencyKey {
// MARK: Associated types
/// The associated type representing the type of the dependency key's value.
associatedtype Value
// MARK: Properties
/// The default value for the dependency key.
static var currentValue: Value { get set }
}

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@ -0,0 +1,28 @@
//
// DependencyService.swift
// Dependency
//
// Created by Javier Cicchelli on 11/04/2023.
// Copyright © 2023 Röck+Cöde. All rights reserved.
//
/// This service provide write/read access to the injected dependencies.
public struct DependencyService {
// MARK: Properties
private static var current = DependencyService()
// MARK: Subscripts
public static subscript<DK: DependencyKey>(key: DK.Type) -> DK.Value {
get { key.currentValue }
set { key.currentValue = newValue }
}
public static subscript<D>(_ keyPath: WritableKeyPath<DependencyService, D>) -> D {
get { current[keyPath: keyPath] }
set { current[keyPath: keyPath] = newValue }
}
}

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@ -0,0 +1,34 @@
//
// TestServices.swift
// DependencyTests
//
// Created by Javier Cicchelli on 11/04/2023.
// Copyright © 2023 Röck+Cöde. All rights reserved.
//
import Dependency
// MARK: - Protocols
protocol TestService {}
// MARK: - Services
struct SomeService: TestService, Equatable {}
struct SomeOtherService: TestService, Equatable {}
// MARK: - DependencyKey
struct TestServiceKey: DependencyKey {
static var currentValue: TestService = SomeService()
}
// MARK: - DependencyService+Keys
extension DependencyService {
var testService: TestService {
get { Self[TestServiceKey.self] }
set { Self[TestServiceKey.self] = newValue }
}
}

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@ -0,0 +1,74 @@
//
// DependencyTests.swift
// DependencyTests
//
// Created by Javier Cicchelli on 11/04/2023.
// Copyright © 2023 Röck+Cöde. All rights reserved.
//
import XCTest
@testable import Dependency
final class DependencyTests: XCTestCase {
// MARK: Properties
private var subject: TestSubject!
// MARK: Setup
override func setUp() {
DependencyService[\.testService] = SomeService()
}
// MARK: Tests
func test_readTestService() {
// GIVEN
subject = .init()
// WHEN
let service = subject.testService
// THEN
XCTAssertNotNil(service)
XCTAssert(service is SomeService)
}
func test_writeDependencyKey() async throws {
// GIVEN
subject = .init()
subject.testService = SomeOtherService()
// WHEN
let service = DependencyService[\.testService]
// THEN
XCTAssertNotNil(service)
XCTAssert(service is SomeOtherService)
}
func test_writeDependencyKeyTwice() async throws {
// GIVEN
subject = .init()
subject.testService = SomeOtherService()
subject.testService = SomeService()
// WHEN
let service = DependencyService[\.testService]
// THEN
XCTAssertNotNil(service)
XCTAssert(service is SomeService)
}
}
// MARK: - TestSubject
private struct TestSubject {
@Dependency(\.testService) var testService
}

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@ -0,0 +1,58 @@
//
// DependencyServiceTests.swift
// DependencyTests
//
// Created by Javier Cicchelli on 11/04/2023.
// Copyright © 2023 Röck+Cöde. All rights reserved.
//
import XCTest
@testable import Dependency
final class DependencyServiceTests: XCTestCase {
// MARK: Setup
override func setUp() {
DependencyService[\.testService] = SomeService()
}
// MARK: Tests
func test_readDependencyKey() async throws {
// GIVEN
// WHEN
let service = DependencyService[\.testService]
// THEN
XCTAssertNotNil(service)
XCTAssert(service is SomeService)
}
func test_writeDependencyKey() async throws {
// GIVEN
DependencyService[\.testService] = SomeOtherService()
// WHEN
let service = DependencyService[\.testService]
// THEN
XCTAssertNotNil(service)
XCTAssert(service is SomeOtherService)
}
func test_writeDependencyKeyTwice() async throws {
// GIVEN
DependencyService[\.testService] = SomeOtherService()
DependencyService[\.testService] = SomeService()
// WHEN
let service = DependencyService[\.testService]
// THEN
XCTAssertNotNil(service)
XCTAssert(service is SomeService)
}
}