feat: open-source 小浣熊阅读 for iOS

Tests/LegadoCoreTests/BookSourceRepositoryTests.swift

@@ -0,0 +1,45 @@
+import Foundation
+import Testing
+@testable import LegadoCore
+
+struct BookSourceRepositoryTests {
+    @Test func fileRepositoryPersistsAtomically() async throws {
+        let directory = FileManager.default.temporaryDirectory
+            .appending(path: UUID().uuidString, directoryHint: .isDirectory)
+        defer { try? FileManager.default.removeItem(at: directory) }
+        let repository = FileBookSourceRepository(fileURL: directory.appending(path: "sources.json"))
+        let expected = [BookSource(bookSourceUrl: "https://saved.test", bookSourceName: "已保存")]
+
+        try await repository.save(expected)
+        let loaded = try await repository.load()
+
+        #expect(loaded == expected)
+    }
+
+    @Test func groupOperationsSplitSeparatorsAndDeduplicate() {
+        var source = BookSource(bookSourceUrl: "https://groups.test", bookSourceName: "分组源")
+        source.bookSourceGroup = "文学, 科幻；文学;听书"
+
+        #expect(source.groups == ["文学", "科幻", "听书"])
+        #expect(source.hasGroup("科幻"))
+
+        source.addGroups("悬疑，科幻")
+        #expect(source.groups == ["文学", "科幻", "听书", "悬疑"])
+
+        source.removeGroups("文学;听书")
+        #expect(source.bookSourceGroup == "科幻,悬疑")
+    }
+
+    @Test func renamesAndDeletesGroupsWithoutLeavingEmptyText() {
+        var source = BookSource(bookSourceUrl: "https://rename.test", bookSourceName: "重命名源")
+        source.bookSourceGroup = "旧组,保留"
+
+        source.replaceGroup("旧组", with: "新组")
+        #expect(source.groups == ["保留", "新组"])
+        source.replaceGroup("保留", with: nil)
+        source.removeGroups("新组")
+
+        #expect(source.groups.isEmpty)
+        #expect(source.bookSourceGroup == nil)
+    }
+}