Canopy type conformance in extension

Targets/CanopyTestTools/Sources/MockCanopy/MockCanopy.swift

@@ -7,12 +7,26 @@ import CloudKit
 /// You initialize MockCanopy with static container and databases, perhaps instances
 /// of `ReplayingMockContainer` and `ReplayingMockDatabase`, and
 /// then plays back their static content in response to Canopy API calls.
-public struct MockCanopy: CanopyType {
+public struct MockCanopy {
   private let container: CKContainerAPIType
   private let privateDatabase: CKDatabaseAPIType
   private let publicDatabase: CKDatabaseAPIType
   private let sharedDatabase: CKDatabaseAPIType
 
+  public init(
+    container: CKContainerAPIType = ReplayingMockContainer(),
+    privateDatabase: CKDatabaseAPIType = ReplayingMockDatabase(),
+    publicDatabase: CKDatabaseAPIType = ReplayingMockDatabase(),
+    sharedDatabase: CKDatabaseAPIType = ReplayingMockDatabase()
+  ) {
+    self.container = container
+    self.privateDatabase = privateDatabase
+    self.publicDatabase = publicDatabase
+    self.sharedDatabase = sharedDatabase
+  }
+}
+
+extension MockCanopy: CanopyType {
   public func containerAPI() async -> CKContainerAPIType {
     container
   }