chore: Migrate tests to swift-testing and update assertions

Author: Shibo Lyu

Tests/TypedAppStorageTests/TypedAppStorageTests.swift

@@ -1,5 +1,5 @@
 import SwiftUI
-import XCTest
+import Testing
 
 @testable import TypedAppStorage
 
@@ -47,40 +47,49 @@ struct TestArticleWithADifferentDefault: View {
   }
 }
 
-final class TypedAppStorageTests: XCTestCase {
-  override func setUp() {
+@Suite("TypedAppStorage Tests", .serialized)
+struct TypedAppStorageTests {
+
+  init() {
     UserDefaults.standard.removeObject(forKey: "preferredFruit")
   }
 
-  func testReadDefaultValue() throws {
+  @Test("Read default value")
+  func readDefaultValue() throws {
+    UserDefaults.standard.removeObject(forKey: "preferredFruit")
     let testArticle = TestArticle()
 
-    XCTAssertEqual(
-      testArticle.preferredFruit,
-      PreferredFruit(.veryFresh, .apple)
+    #expect(
+      testArticle.preferredFruit == PreferredFruit(.veryFresh, .apple)
     )
   }
 
-  func testCallSiteDefault() throws {
+  @Test("Call-site default")
+  func callSiteDefault() throws {
+    UserDefaults.standard.removeObject(forKey: "preferredFruit")
     let testArticle = TestArticleWithADifferentDefault()
 
-    XCTAssertEqual(testArticle.preferredFruit, .init(.moderate, .pear))
+    #expect(testArticle.preferredFruit == .init(.moderate, .pear))
   }
 
-  func testSaveAndReadBack() throws {
+  @Test("Save and read back")
+  func saveAndReadBack() throws {
+    UserDefaults.standard.removeObject(forKey: "preferredFruit")
     let testArticle = TestArticle()
 
     testArticle.changePreferred(to: .init(.somewhatStale, .banana))
 
-    XCTAssertEqual(testArticle.preferredFruit, .init(.somewhatStale, .banana))
+    #expect(testArticle.preferredFruit == .init(.somewhatStale, .banana))
   }
 
-  func testSaveAndReadElsewhere() throws {
+  @Test("Save and read elsewhere")
+  func saveAndReadElsewhere() throws {
+    UserDefaults.standard.removeObject(forKey: "preferredFruit")
     let articleA = TestArticle()
     let articleB = TestArticle()
 
     articleA.changePreferred(to: .init(.moderate, .banana))
 
-    XCTAssertEqual(articleB.preferredFruit, .init(.moderate, .banana))
+    #expect(articleB.preferredFruit == .init(.moderate, .banana))
   }
 }