1 files changed, 92 insertions, 0 deletions
diff --git a/SoraTests/SettingsManagerSyncTests.swift b/SoraTests/SettingsManagerSyncTests.swift
index 27f05f5..72cf2ad 100644
--- a/SoraTests/SettingsManagerSyncTests.swift
+++ b/SoraTests/SettingsManagerSyncTests.swift
@@ -1,7 +1,98 @@
 import Foundation
 import XCTest
 
+// swiftlint:disable type_body_length
 final class SettingsManagerSyncTests: XCTestCase {
+  func testBookmarkMutationPathReusesEncodedPayload() throws {
+    let source = try loadSource(at: "Sora/Data/Settings/SettingsManager.swift")
+    let addBookmarkSection = try extractFunction(
+      named: "func addBookmark(provider: BooruProvider, tags: [String], folder: UUID? = nil)",
+      from: source
+    )
+    let updateBookmarksSection = try extractFunction(named: "func updateBookmarks(", from: source)
+    let bookmarksSetterSection = try extractFunction(named: "var bookmarks: [SettingsBookmark]", from: source)
+    let normalizedAddBookmark = strippingCommentsAndStrings(from: addBookmarkSection)
+    let normalizedUpdateBookmarks = strippingCommentsAndStrings(from: updateBookmarksSection)
+    let normalizedBookmarksSetter = strippingCommentsAndStrings(from: bookmarksSetterSection)
+
+    let addBookmarkInlineEncodeCount = tokenCount(
+      matching: #"Self\s*\.\s*encode\s*\(\s*updatedBookmarks\s*\)"#,
+      in: normalizedAddBookmark
+    )
+    let updateBookmarksPreEncodedForwardCount = tokenCount(
+      matching: #"syncableData\s*\([\s\S]*?\bencodedData\s*:"#,
+      in: normalizedUpdateBookmarks
+    )
+    let bookmarksSetterPreEncodedForwardCount = tokenCount(
+      matching: #"syncableData\s*\([\s\S]*?\bencodedData\s*:"#,
+      in: normalizedBookmarksSetter
+    )
+
+    // swiftlint:disable:next prefer_nimble
+    XCTAssertEqual(
+      addBookmarkInlineEncodeCount,
+      0,
+      "addBookmark should not pre-encode and then trigger another encode downstream."
+    )
+    // swiftlint:disable:next prefer_nimble
+    XCTAssertGreaterThan(
+      updateBookmarksPreEncodedForwardCount,
+      0,
+      "updateBookmarks should forward a pre-encoded payload to syncableData to avoid duplicate encoding."
+    )
+    // swiftlint:disable:next prefer_nimble
+    XCTAssertGreaterThan(
+      bookmarksSetterPreEncodedForwardCount,
+      0,
+      "bookmarks setter should forward a pre-encoded payload to syncableData."
+    )
+  }
+
+  func testFavoriteMutationPathReusesEncodedPayload() throws {
+    let source = try loadSource(at: "Sora/Data/Settings/SettingsManager.swift")
+    let addFavoriteSection = try extractFunction(
+      named: "func addFavorite(post: BooruPost, provider: BooruProvider, folder: UUID? = nil)",
+      from: source
+    )
+    let updateFavoritesSection = try extractFunction(named: "func updateFavorites(", from: source)
+    let favoritesSetterSection = try extractFunction(named: "var favorites: [SettingsFavoritePost]", from: source)
+    let normalizedAddFavorite = strippingCommentsAndStrings(from: addFavoriteSection)
+    let normalizedUpdateFavorites = strippingCommentsAndStrings(from: updateFavoritesSection)
+    let normalizedFavoritesSetter = strippingCommentsAndStrings(from: favoritesSetterSection)
+
+    let addFavoriteInlineEncodeCount = tokenCount(
+      matching: #"Self\s*\.\s*encode\s*\(\s*updatedFavorites\s*\)"#,
+      in: normalizedAddFavorite
+    )
+    let updateFavoritesPreEncodedForwardCount = tokenCount(
+      matching: #"syncableData\s*\([\s\S]*?\bencodedData\s*:"#,
+      in: normalizedUpdateFavorites
+    )
+    let favoritesSetterPreEncodedForwardCount = tokenCount(
+      matching: #"syncableData\s*\([\s\S]*?\bencodedData\s*:"#,
+      in: normalizedFavoritesSetter
+    )
+
+    // swiftlint:disable:next prefer_nimble
+    XCTAssertEqual(
+      addFavoriteInlineEncodeCount,
+      0,
+      "addFavorite should not pre-encode and then trigger another encode downstream."
+    )
+    // swiftlint:disable:next prefer_nimble
+    XCTAssertGreaterThan(
+      updateFavoritesPreEncodedForwardCount,
+      0,
+      "updateFavorites should forward a pre-encoded payload to syncableData to avoid duplicate encoding."
+    )
+    // swiftlint:disable:next prefer_nimble
+    XCTAssertGreaterThan(
+      favoritesSetterPreEncodedForwardCount,
+      0,
+      "favorites setter should forward a pre-encoded payload to syncableData."
+    )
+  }
+
   func testBatchedSyncPathGuardsUnchangedPayloadWrites() throws {
     let source = try loadSource(at: "Sora/Data/Settings/SettingsManager.swift")
     let triggerSyncSection = try extractFunction(
@@ -235,3 +326,4 @@ final class SettingsManagerSyncTests: XCTestCase {
     return regex.numberOfMatches(in: source, range: range)
   }
 }
+// swiftlint:enable type_body_length