From 0b254c4446482aba098884790ac2e2e8c8b7fc26 Mon Sep 17 00:00:00 2001
From: Dariusz Rybicki <dariusz@elixxir.io>
Date: Tue, 23 Aug 2022 00:13:11 +0100
Subject: [PATCH] Add Stored utility
---
Sources/XXMessengerClient/Utils/Stored.swift | 41 +++++++++++++++++++
.../Messenger/Utils/StoredTests.swift | 18 ++++++++
2 files changed, 59 insertions(+)
create mode 100644 Sources/XXMessengerClient/Utils/Stored.swift
create mode 100644 Tests/XXMessengerClientTests/Messenger/Utils/StoredTests.swift
diff --git a/Sources/XXMessengerClient/Utils/Stored.swift b/Sources/XXMessengerClient/Utils/Stored.swift
new file mode 100644
index 00000000..56b5e97e
--- /dev/null
+++ b/Sources/XXMessengerClient/Utils/Stored.swift
@@ -0,0 +1,41 @@
+import XCTestDynamicOverlay
+
+public struct Stored<Value> {
+ public var get: () -> Value
+ public var set: (Value) -> Void
+
+ public func callAsFunction() -> Value {
+ get()
+ }
+}
+
+extension Stored {
+ public static func inMemory(_ value: Value) -> Stored<Value> {
+ let memory = Memory(value)
+ return Stored(
+ get: { memory.value },
+ set: { memory.value = $0 }
+ )
+ }
+
+ public static func inMemory<V>() -> Stored<Optional<V>> where Value == Optional<V> {
+ inMemory(nil)
+ }
+}
+
+private final class Memory<Value> {
+ init(_ value: Value) {
+ self.value = value
+ }
+
+ var value: Value
+}
+
+extension Stored {
+ public static func unimplemented() -> Stored<Value> {
+ Stored<Value>(
+ get: XCTUnimplemented("\(Self.self).get"),
+ set: XCTUnimplemented("\(Self.self).set")
+ )
+ }
+}
diff --git a/Tests/XXMessengerClientTests/Messenger/Utils/StoredTests.swift b/Tests/XXMessengerClientTests/Messenger/Utils/StoredTests.swift
new file mode 100644
index 00000000..154f6196
--- /dev/null
+++ b/Tests/XXMessengerClientTests/Messenger/Utils/StoredTests.swift
@@ -0,0 +1,18 @@
+import XCTest
+@testable import XXMessengerClient
+
+final class StoredTests: XCTestCase {
+ func testInMemory() throws {
+ let stored: Stored<String?> = .inMemory()
+
+ XCTAssertNil(stored())
+
+ stored.set("test")
+
+ XCTAssertEqual(stored(), "test")
+
+ stored.set(nil)
+
+ XCTAssertNil(stored())
+ }
+}
--
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