[#795] Include sapling-spend file into bundle for tests

Closes #795

- Added structure `SaplingParamsSourceURL` which holds source URLs for
  sapling-spend file and sapling-output file. URLs are ultimately passed
  to `SaplingParameterDownloader`.
- This is done so it's possible to pass different URLs when running
  tests.
- sapling-spend file and sapling-output file are in tests bundle. And
  when running tests these files are loaded from bundle and not from
  network.

.gitignore

@@ -10,8 +10,6 @@
 ## These are backup files generated by rustfmt
 **/*.rs.bk
 
-# params files
-*.params
 # Xcode
 
 ## Build generated

CHANGELOG.md

@@ -4,6 +4,12 @@
     `synchronizerStopped` notification is now sent after the sync process stops. It's
 not sent right when `stop()` method is called.
 
+- [#795] Include sapling-spend file into bundle for tests
+    
+    This is only an internal change and doesn't change the behavior of the SDK. `Initializer`'s
+constructor has a new parameter `saplingParamsSourceURL`. Use `SaplingParamsSourceURL.default` 
+value for this parameter.
+
 - [#764] Refactor communication between components inside th SDK
 
     This is mostly an internal change. A consequence of this change is that all the notifications

Example/ZcashLightClientSample/ZcashLightClientSample/AppDelegate.swift

@@ -44,6 +44,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
                 network: kZcashNetwork,
                 spendParamsURL: try! spendParamsURLHelper(),
                 outputParamsURL: try! outputParamsURLHelper(),
+                saplingParamsSourceURL: SaplingParamsSourceURL.default,
                 viewingKeys: [ufvk],
                 walletBirthday: DemoAppConfig.birthdayHeight,
                 loggerProxy: loggerProxy

Example/ZcashLightClientSample/ZcashLightClientSample/Sapling Parameters/SaplingParametersViewController.swift

@@ -84,7 +84,9 @@ class SaplingParametersViewController: UIViewController {
             do {
                 let urls = try await SaplingParameterDownloader.downloadParamsIfnotPresent(
                     spendURL: spendParameter,
-                    outputURL: outputParameter
+                    spendSourceURL: SaplingParamsSourceURL.default.spendParamFileURL,
+                    outputURL: outputParameter,
+                    outputSourceURL: SaplingParamsSourceURL.default.outputParamFileURL
                 )
                 spendPath.text = urls.spend.path
                 outputPath.text = urls.output.path

Package.swift

@@ -50,7 +50,9 @@ let package = Package(
                 .copy("Resources/sandblasted_mainnet_block.json"),
                 .copy("Resources/txBase64String.txt"),
                 .copy("Resources/txFromAndroidSDK.txt"),
-                .copy("Resources/integerOverflowJSON.json")
+                .copy("Resources/integerOverflowJSON.json"),
+                .copy("Resources/sapling-spend.params"),
+                .copy("Resources/sapling-output.params")
             ]
         ),
         .testTarget(

Sources/ZcashLightClientKit/Block/CompactBlockProcessor.swift

@@ -142,6 +142,7 @@ actor CompactBlockProcessor {
     /// - parameter spendParamsURL: absolute file path of the sapling-spend.params file
     /// - parameter outputParamsURL: absolute file path of the sapling-output.params file
     struct Configuration {
+        let saplingParamsSourceURL: SaplingParamsSourceURL
         public var fsBlockCacheRoot: URL
         public var dataDb: URL
         public var spendParamsURL: URL
@@ -167,6 +168,7 @@ actor CompactBlockProcessor {
             dataDb: URL,
             spendParamsURL: URL,
             outputParamsURL: URL,
+            saplingParamsSourceURL: SaplingParamsSourceURL,
             downloadBatchSize: Int,
             retries: Int,
             maxBackoffInterval: TimeInterval,
@@ -179,6 +181,7 @@ actor CompactBlockProcessor {
             self.dataDb = dataDb
             self.spendParamsURL = spendParamsURL
             self.outputParamsURL = outputParamsURL
+            self.saplingParamsSourceURL = saplingParamsSourceURL
             self.network = network
             self.downloadBatchSize = downloadBatchSize
             self.retries = retries
@@ -195,6 +198,7 @@ actor CompactBlockProcessor {
             dataDb: URL,
             spendParamsURL: URL,
             outputParamsURL: URL,
+            saplingParamsSourceURL: SaplingParamsSourceURL,
             walletBirthday: BlockHeight,
             network: ZcashNetwork
         ) {
@@ -202,6 +206,7 @@ actor CompactBlockProcessor {
             self.dataDb = dataDb
             self.spendParamsURL = spendParamsURL
             self.outputParamsURL = outputParamsURL
+            self.saplingParamsSourceURL = saplingParamsSourceURL
             self.walletBirthday = walletBirthday
             self.saplingActivation = network.constants.saplingActivationHeight
             self.network = network
@@ -346,6 +351,7 @@ actor CompactBlockProcessor {
                 dataDb: initializer.dataDbURL,
                 spendParamsURL: initializer.spendParamsURL,
                 outputParamsURL: initializer.outputParamsURL,
+                saplingParamsSourceURL: initializer.saplingParamsSourceURL,
                 walletBirthday: Checkpoint.birthday(
                     with: initializer.walletBirthday,
                     network: initializer.network
@@ -417,7 +423,8 @@ actor CompactBlockProcessor {
             dataDb: config.dataDb,
             networkType: config.network.networkType,
             outputParamsURL: config.outputParamsURL,
-            spendParamsURL: config.spendParamsURL
+            spendParamsURL: config.spendParamsURL,
+            saplingParamsSourceURL: config.saplingParamsSourceURL
         )
         self.saplingParametersHandler = SaplingParametersHandlerImpl(config: saplingParametersHandlerConfig, rustBackend: backend)
 
@@ -1006,23 +1013,6 @@ actor CompactBlockProcessor {
     // TODO: [#713] encapsulate service errors better, https://github.com/zcash/ZcashLightClientKit/issues/713
 }
 
-extension CompactBlockProcessor.Configuration {
-    /**
-    Standard configuration for most compact block processors
-    */
-    static func standard(for network: ZcashNetwork, walletBirthday: BlockHeight) -> CompactBlockProcessor.Configuration {
-        let pathProvider = DefaultResourceProvider(network: network)
-        return CompactBlockProcessor.Configuration(
-            fsBlockCacheRoot: pathProvider.fsCacheURL,
-            dataDb: pathProvider.dataDbURL,
-            spendParamsURL: pathProvider.spendParamsURL,
-            outputParamsURL: pathProvider.outputParamsURL,
-            walletBirthday: walletBirthday,
-            network: network
-        )
-    }
-}
-
 extension LightWalletServiceError {
     func mapToProcessorError() -> CompactBlockProcessorError {
         switch self {

Sources/ZcashLightClientKit/Block/SaplingParameters/SaplingParametersHandler.swift

@@ -12,6 +12,7 @@ struct SaplingParametersHandlerConfig {
     let networkType: NetworkType
     let outputParamsURL: URL
     let spendParamsURL: URL
+    let saplingParamsSourceURL: SaplingParamsSourceURL
 }
 
 protocol SaplingParametersHandler {
@@ -50,6 +51,11 @@ extension SaplingParametersHandlerImpl: SaplingParametersHandler {
             return
         }
 
-        try await SaplingParameterDownloader.downloadParamsIfnotPresent(spendURL: config.spendParamsURL, outputURL: config.outputParamsURL)
+        try await SaplingParameterDownloader.downloadParamsIfnotPresent(
+            spendURL: config.spendParamsURL,
+            spendSourceURL: config.saplingParamsSourceURL.spendParamFileURL,
+            outputURL: config.outputParamsURL,
+            outputSourceURL: config.saplingParamsSourceURL.outputParamFileURL
+        )
     }
 }

Sources/ZcashLightClientKit/Constants/ZcashSDK.swift

@@ -131,16 +131,20 @@ public enum ZcashSDK {
     /// Default name for pending transactions db
     public static var defaultPendingDbName = "pending.db"
 
-    /// File name for the sapling spend params
-    public static var spendParamFilename = "sapling-spend.params"
-
-    /// File name for the sapling output params
-    public static var outputParamFilename = "sapling-output.params"
-
     /// The Url that is used by default in zcashd.
     /// We'll want to make this externally configurable, rather than baking it into the SDK but
     /// this will do for now, since we're using a cloudfront URL that already redirects.
-    public static var cloudParameterURL = "https://z.cash/downloads/"
+    public static let cloudParameterURL = "https://z.cash/downloads/"
+
+    /// File name for the sapling spend params
+    public static let spendParamFilename = "sapling-spend.params"
+    // swiftlint:disable:next force_unwrapping
+    public static let spendParamFileURL = URL(string: cloudParameterURL)!.appendingPathComponent(spendParamFilename)
+
+    /// File name for the sapling output params
+    public static let outputParamFilename = "sapling-output.params"
+    // swiftlint:disable:next force_unwrapping
+    public static let outputParamFileURL = URL(string: cloudParameterURL)!.appendingPathComponent(outputParamFilename)
 }
 
 public protocol NetworkConstants {

Sources/ZcashLightClientKit/Initializer.swift

@@ -57,6 +57,17 @@ extension Notification.Name {
     static let connectionStatusChanged = Notification.Name("LightWalletServiceConnectivityStatusChanged")
 }
 
+/// This contains URLs from which can the SDK fetch files that contain sapling parameters.
+/// Use `SaplingParamsSourceURL.default` when initilizing the SDK.
+public struct SaplingParamsSourceURL {
+    public let spendParamFileURL: URL
+    public let outputParamFileURL: URL
+
+    public static var `default`: SaplingParamsSourceURL {
+        return SaplingParamsSourceURL(spendParamFileURL: ZcashSDK.spendParamFileURL, outputParamFileURL: ZcashSDK.outputParamFileURL)
+    }
+}
+
 /**
 Wrapper for all the Rust backend functionality that does not involve processing blocks. This
 class initializes the Rust backend and the supporting data required to exercise those abilities.
@@ -70,27 +81,28 @@ public class Initializer {
         case seedRequired
     }
 
-    private(set) var rustBackend: ZcashRustBackendWelding.Type
+    let rustBackend: ZcashRustBackendWelding.Type
-    private(set) var alias: String
+    let alias: String
-    private(set) var endpoint: LightWalletEndpoint
+    let endpoint: LightWalletEndpoint
-    
+    let fsBlockDbRoot: URL
-    private var lowerBoundHeight: BlockHeight
+    let dataDbURL: URL
-    private(set) var fsBlockDbRoot: URL
+    let pendingDbURL: URL
-    private(set) var dataDbURL: URL
+    let spendParamsURL: URL
-    private(set) var pendingDbURL: URL
+    let outputParamsURL: URL
-    private(set) var spendParamsURL: URL
+    let saplingParamsSourceURL: SaplingParamsSourceURL
-    private(set) var outputParamsURL: URL
+    let lightWalletService: LightWalletService
-    private(set) var lightWalletService: LightWalletService
+    let transactionRepository: TransactionRepository
-    private(set) var transactionRepository: TransactionRepository
+    let accountRepository: AccountRepository
-    private(set) var accountRepository: AccountRepository
+    let storage: CompactBlockRepository
-    private(set) var storage: CompactBlockRepository
+    let blockDownloaderService: BlockDownloaderService
-    private(set) var blockDownloaderService: BlockDownloaderService
+    let network: ZcashNetwork
-    private(set) var network: ZcashNetwork
+    public let viewingKeys: [UnifiedFullViewingKey]
-    private(set) public var viewingKeys: [UnifiedFullViewingKey]
     /// The effective birthday of the wallet based on the height provided when initializing
     /// and the checkpoints available on this SDK
     private(set) public var walletBirthday: BlockHeight
 
+    private var lowerBoundHeight: BlockHeight
+
     /// The purpose of this to migrate from cacheDb to fsBlockDb
     private var cacheDbURL: URL?
 
@@ -110,6 +122,7 @@ public class Initializer {
         network: ZcashNetwork,
         spendParamsURL: URL,
         outputParamsURL: URL,
+        saplingParamsSourceURL: SaplingParamsSourceURL,
         viewingKeys: [UnifiedFullViewingKey],
         walletBirthday: BlockHeight,
         alias: String = "",
@@ -142,6 +155,7 @@ public class Initializer {
             ),
             spendParamsURL: spendParamsURL,
             outputParamsURL: outputParamsURL,
+            saplingParamsSourceURL: saplingParamsSourceURL,
             viewingKeys: viewingKeys,
             walletBirthday: walletBirthday,
             alias: alias,
@@ -171,6 +185,7 @@ public class Initializer {
         network: ZcashNetwork,
         spendParamsURL: URL,
         outputParamsURL: URL,
+        saplingParamsSourceURL: SaplingParamsSourceURL,
         viewingKeys: [UnifiedFullViewingKey],
         walletBirthday: BlockHeight,
         alias: String = "",
@@ -203,6 +218,7 @@ public class Initializer {
             ),
             spendParamsURL: spendParamsURL,
             outputParamsURL: outputParamsURL,
+            saplingParamsSourceURL: saplingParamsSourceURL,
             viewingKeys: viewingKeys,
             walletBirthday: walletBirthday,
             alias: alias,
@@ -228,6 +244,7 @@ public class Initializer {
         storage: CompactBlockRepository,
         spendParamsURL: URL,
         outputParamsURL: URL,
+        saplingParamsSourceURL: SaplingParamsSourceURL,
         viewingKeys: [UnifiedFullViewingKey],
         walletBirthday: BlockHeight,
         alias: String = "",
@@ -243,6 +260,7 @@ public class Initializer {
         self.endpoint = endpoint
         self.spendParamsURL = spendParamsURL
         self.outputParamsURL = outputParamsURL
+        self.saplingParamsSourceURL = saplingParamsSourceURL
         self.alias = alias
         self.lightWalletService = service
         self.transactionRepository = repository

Sources/ZcashLightClientKit/Synchronizer/SDKSynchronizer.swift

@@ -397,7 +397,9 @@ public class SDKSynchronizer: Synchronizer {
         do {
             try await SaplingParameterDownloader.downloadParamsIfnotPresent(
                 spendURL: initializer.spendParamsURL,
-                outputURL: initializer.outputParamsURL
+                spendSourceURL: initializer.saplingParamsSourceURL.spendParamFileURL,
+                outputURL: initializer.outputParamsURL,
+                outputSourceURL: initializer.saplingParamsSourceURL.outputParamFileURL
             )
         } catch {
             throw SynchronizerError.parameterMissing(underlyingError: error)

Sources/ZcashLightClientKit/Utils/SaplingParameterDownloader.swift

@@ -21,30 +21,17 @@ extension Digest {
 /// Helper class to handle the download of Sapling parameters
 public enum SaplingParameterDownloader {
     public enum Errors: Error {
-        case invalidURL(url: String)
         case failed(error: Error)
         case spendParamsInvalidSHA1
         case outputParamsInvalidSHA1
     }
 
-    public static var spendParamsURLString: String {
-        return ZcashSDK.cloudParameterURL + ZcashSDK.spendParamFilename
-    }
-    
-    public static var outputParamsURLString: String {
-        return ZcashSDK.cloudParameterURL + ZcashSDK.outputParamFilename
-    }
-
     /// Download a Spend parameter from default host and stores it at given URL
     /// - Parameters:
     ///     - at: The destination URL for the download
     @discardableResult
-    public static func downloadSpendParameter(_ at: URL) async throws -> URL {
+    public static func downloadSpendParameter(_ at: URL, sourceURL: URL) async throws -> URL {
-        guard let url = URL(string: spendParamsURLString) else {
+        let resultURL = try await downloadFileWithRequestWithContinuation(URLRequest(url: sourceURL), at: at)
-            throw Errors.invalidURL(url: spendParamsURLString)
-        }
-
-        let resultURL = try await downloadFileWithRequestWithContinuation(URLRequest(url: url), at: at)
         try isSpendParamsSHA1Valid(url: resultURL)
         return resultURL
     }
@@ -53,12 +40,8 @@ public enum SaplingParameterDownloader {
     /// - Parameters:
     ///     - at: The destination URL for the download
     @discardableResult
-    public static func downloadOutputParameter(_ at: URL) async throws -> URL {
+    public static func downloadOutputParameter(_ at: URL, sourceURL: URL) async throws -> URL {
-        guard let url = URL(string: outputParamsURLString) else {
+        let resultURL = try await downloadFileWithRequestWithContinuation(URLRequest(url: sourceURL), at: at)
-            throw Errors.invalidURL(url: outputParamsURLString)
-        }
-
-        let resultURL = try await downloadFileWithRequestWithContinuation(URLRequest(url: url), at: at)
         try isOutputParamsSHA1Valid(url: resultURL)
         return resultURL
     }
@@ -70,11 +53,13 @@ public enum SaplingParameterDownloader {
     @discardableResult
     public static func downloadParamsIfnotPresent(
         spendURL: URL,
-        outputURL: URL
+        spendSourceURL: URL,
+        outputURL: URL,
+        outputSourceURL: URL
     ) async throws -> (spend: URL, output: URL) {
         do {
-            async let spendResultURL = ensureSpendParameter(at: spendURL)
+            async let spendResultURL = ensureSpendParameter(at: spendURL, sourceURL: spendSourceURL)
-            async let outputResultURL = ensureOutputParameter(at: outputURL)
+            async let outputResultURL = ensureOutputParameter(at: outputURL, sourceURL: outputSourceURL)
             
             let results = try await [spendResultURL, outputResultURL]
             return (spend: results[0], output: results[1])
@@ -83,21 +68,21 @@ public enum SaplingParameterDownloader {
         }
     }
         
-    static func ensureSpendParameter(at url: URL) async throws -> URL {
+    static func ensureSpendParameter(at url: URL, sourceURL: URL) async throws -> URL {
         if isFilePresent(url: url) {
             try isSpendParamsSHA1Valid(url: url)
             return url
         } else {
-            return try await downloadSpendParameter(url)
+            return try await downloadSpendParameter(url, sourceURL: sourceURL)
         }
     }
     
-    static func ensureOutputParameter(at url: URL) async throws -> URL {
+    static func ensureOutputParameter(at url: URL, sourceURL: URL) async throws -> URL {
         if isFilePresent(url: url) {
             try isOutputParamsSHA1Valid(url: url)
             return url
         } else {
-            return try await downloadOutputParameter(url)
+            return try await downloadOutputParameter(url, sourceURL: sourceURL)
         }
     }
     
@@ -147,6 +132,7 @@ private extension SaplingParameterDownloader {
         at destination: URL,
         result: @escaping (Result<URL, Error>) -> Void
     ) {
+        LoggerProxy.debug("Downloading sapling file from \(request.url)")
         let task = URLSession.shared.downloadTask(with: request) { url, _, error in
             if let error = error {
                 result(.failure(Errors.failed(error: error)))

Tests/DarksideTests/TransactionEnhancementTests.swift

@@ -66,6 +66,7 @@ class TransactionEnhancementTests: XCTestCase {
             dataDb: pathProvider.dataDbURL,
             spendParamsURL: pathProvider.spendParamsURL,
             outputParamsURL: pathProvider.outputParamsURL,
+            saplingParamsSourceURL: SaplingParamsSourceURL.tests,
             walletBirthday: birthday.height,
             network: network
         )

Tests/NetworkTests/BlockScanTests.swift

@@ -95,6 +95,7 @@ class BlockScanTests: XCTestCase {
             dataDb: dataDbURL,
             spendParamsURL: spendParamsURL,
             outputParamsURL: outputParamsURL,
+            saplingParamsSourceURL: SaplingParamsSourceURL.tests,
             walletBirthday: walletBirthDay.height,
             network: network
         )
@@ -183,6 +184,7 @@ class BlockScanTests: XCTestCase {
             dataDb: dataDbURL,
             spendParamsURL: spendParamsURL,
             outputParamsURL: outputParamsURL,
+            saplingParamsSourceURL: SaplingParamsSourceURL.tests,
             walletBirthday: network.constants.saplingActivationHeight,
             network: network
         )

Tests/NetworkTests/CompactBlockProcessorTests.swift

@@ -19,6 +19,7 @@ class CompactBlockProcessorTests: XCTestCase {
             dataDb: pathProvider.dataDbURL,
             spendParamsURL: pathProvider.spendParamsURL,
             outputParamsURL: pathProvider.outputParamsURL,
+            saplingParamsSourceURL: SaplingParamsSourceURL.tests,
             walletBirthday: ZcashNetworkBuilder.network(for: .testnet).constants.saplingActivationHeight,
             network: ZcashNetworkBuilder.network(for: .testnet)
         )

Tests/NetworkTests/CompactBlockReorgTests.swift

@@ -19,6 +19,7 @@ class CompactBlockReorgTests: XCTestCase {
             dataDb: pathProvider.dataDbURL,
             spendParamsURL: pathProvider.spendParamsURL,
             outputParamsURL: pathProvider.outputParamsURL,
+            saplingParamsSourceURL: SaplingParamsSourceURL.tests,
             walletBirthday: ZcashNetworkBuilder.network(for: .testnet).constants.saplingActivationHeight,
             network: ZcashNetworkBuilder.network(for: .testnet)
         )

Tests/OfflineTests/BlockBatchValidationTests.swift

@@ -55,6 +55,7 @@ class BlockBatchValidationTests: XCTestCase {
             dataDb: try! __dataDbURL(),
             spendParamsURL: try! __spendParamsURL(),
             outputParamsURL: try! __outputParamsURL(),
+            saplingParamsSourceURL: SaplingParamsSourceURL.tests,
             downloadBatchSize: 100,
             retries: 5,
             maxBackoffInterval: 10,
@@ -124,6 +125,7 @@ class BlockBatchValidationTests: XCTestCase {
             dataDb: try! __dataDbURL(),
             spendParamsURL: try! __spendParamsURL(),
             outputParamsURL: try! __outputParamsURL(),
+            saplingParamsSourceURL: SaplingParamsSourceURL.tests,
             downloadBatchSize: 100,
             retries: 5,
             maxBackoffInterval: 10,
@@ -193,6 +195,7 @@ class BlockBatchValidationTests: XCTestCase {
             dataDb: try! __dataDbURL(),
             spendParamsURL: try! __spendParamsURL(),
             outputParamsURL: try! __outputParamsURL(),
+            saplingParamsSourceURL: SaplingParamsSourceURL.tests,
             downloadBatchSize: 100,
             retries: 5,
             maxBackoffInterval: 10,
@@ -262,6 +265,7 @@ class BlockBatchValidationTests: XCTestCase {
             dataDb: try! __dataDbURL(),
             spendParamsURL: try! __spendParamsURL(),
             outputParamsURL: try! __outputParamsURL(),
+            saplingParamsSourceURL: SaplingParamsSourceURL.tests,
             downloadBatchSize: 100,
             retries: 5,
             maxBackoffInterval: 10,
@@ -329,6 +333,7 @@ class BlockBatchValidationTests: XCTestCase {
             dataDb: try! __dataDbURL(),
             spendParamsURL: try! __spendParamsURL(),
             outputParamsURL: try! __outputParamsURL(),
+            saplingParamsSourceURL: SaplingParamsSourceURL.tests,
             downloadBatchSize: 100,
             retries: 5,
             maxBackoffInterval: 10,
@@ -418,6 +423,7 @@ class BlockBatchValidationTests: XCTestCase {
             dataDb: try! __dataDbURL(),
             spendParamsURL: try! __spendParamsURL(),
             outputParamsURL: try! __outputParamsURL(),
+            saplingParamsSourceURL: SaplingParamsSourceURL.tests,
             downloadBatchSize: 100,
             retries: 5,
             maxBackoffInterval: 10,
@@ -498,6 +504,7 @@ class BlockBatchValidationTests: XCTestCase {
             dataDb: try! __dataDbURL(),
             spendParamsURL: try! __spendParamsURL(),
             outputParamsURL: try! __outputParamsURL(),
+            saplingParamsSourceURL: SaplingParamsSourceURL.tests,
             downloadBatchSize: 100,
             retries: 5,
             maxBackoffInterval: 10,

Tests/OfflineTests/WalletTests.swift

@@ -43,6 +43,7 @@ class WalletTests: XCTestCase {
         let derivationTool = DerivationTool(networkType: network.networkType)
         let ufvk = try derivationTool.deriveUnifiedSpendingKey(seed: seedData.bytes, accountIndex: 0)
             .map({ try derivationTool.deriveUnifiedFullViewingKey(from: $0) })
+
         let wallet = Initializer(
             fsBlockDbRoot: self.testTempDirectory,
             dataDbURL: try __dataDbURL(),
@@ -51,6 +52,7 @@ class WalletTests: XCTestCase {
             network: network,
             spendParamsURL: try __spendParamsURL(),
             outputParamsURL: try __outputParamsURL(),
+            saplingParamsSourceURL: SaplingParamsSourceURL.tests,
             viewingKeys: [ufvk],
             walletBirthday: 663194
         )

Tests/PerformanceTests/SynchronizerTests.swift

@@ -58,6 +58,7 @@ class SynchronizerTests: XCTestCase {
                 network: network,
                 spendParamsURL: try __spendParamsURL(),
                 outputParamsURL: try __outputParamsURL(),
+                saplingParamsSourceURL: SaplingParamsSourceURL.tests,
                 viewingKeys: [ufvk],
                 walletBirthday: birthday,
                 alias: "",

Tests/TestUtils/Stubs.swift

@@ -398,3 +398,26 @@ class MockRustBackend: ZcashRustBackendWelding {
         false
     }
 }
+
+extension SaplingParamsSourceURL {
+    static var tests = SaplingParamsSourceURL(
+        spendParamFileURL: Bundle.module.url(forResource: "sapling-spend", withExtension: "params")!,
+        outputParamFileURL: Bundle.module.url(forResource: "sapling-output", withExtension: "params")!
+    )
+}
+
+extension CompactBlockProcessor.Configuration {
+    /// Standard configuration for most compact block processors
+    static func standard(for network: ZcashNetwork, walletBirthday: BlockHeight) -> CompactBlockProcessor.Configuration {
+        let pathProvider = DefaultResourceProvider(network: network)
+        return CompactBlockProcessor.Configuration(
+            fsBlockCacheRoot: pathProvider.fsCacheURL,
+            dataDb: pathProvider.dataDbURL,
+            spendParamsURL: pathProvider.spendParamsURL,
+            outputParamsURL: pathProvider.outputParamsURL,
+            saplingParamsSourceURL: SaplingParamsSourceURL.tests,
+            walletBirthday: walletBirthday,
+            network: network
+        )
+    }
+}

Tests/TestUtils/TestCoordinator.swift

@@ -223,6 +223,7 @@ extension TestCoordinator {
                 dataDb: config.dataDb,
                 spendParamsURL: config.spendParamsURL,
                 outputParamsURL: config.outputParamsURL,
+                saplingParamsSourceURL: config.saplingParamsSourceURL,
                 downloadBatchSize: config.downloadBatchSize,
                 retries: config.retries,
                 maxBackoffInterval: config.maxBackoffInterval,
@@ -291,6 +292,7 @@ enum TestSynchronizerBuilder {
             network: network,
             spendParamsURL: spendParamsURL,
             outputParamsURL: outputParamsURL,
+            saplingParamsSourceURL: SaplingParamsSourceURL.tests,
             viewingKeys: [unifiedFullViewingKey],
             walletBirthday: walletBirthday,
             alias: "",