Alternative approach

Author: ncooke3

FirebaseRemoteConfig/SwiftNew/ConfigFetch.swift

@@ -107,7 +107,13 @@ extension Installations: InstallationsProtocol {}
 
   /// Provide fetchSession for tests to override.
   /// - Note: Managed internally by the fetch instance.
-  public var fetchSession: any RCNConfigFetchSession
+  private var fetchSession: any RCNConfigFetchSession
+
+  public var configuredFetchSessionProvider: (ConfigSettings) -> RCNConfigFetchSession {
+    didSet {
+      fetchSession = configuredFetchSessionProvider(settings)
+    }
+  }
 
   private let namespace: String
 
@@ -138,8 +144,6 @@ extension Installations: InstallationsProtocol {}
     )
   }
 
-  private let configuredFetchSessionProvider: (ConfigSettings) -> RCNConfigFetchSession
-
   /// Designated initializer
   @objc public init(content: ConfigContent,
                     DBManager: ConfigDBManager,
@@ -180,13 +184,8 @@ extension Installations: InstallationsProtocol {}
     super.init()
   }
 
-  public var disableNetworkSessionRecreation: Bool = false
-
   /// Add the ability to update NSURLSession's timeout after a session has already been created.
   @objc public func recreateNetworkSession() {
-    if disableNetworkSessionRecreation {
-      return
-    }
     fetchSession.invalidateAndCancel()
     fetchSession = configuredFetchSessionProvider(settings)
   }

FirebaseRemoteConfig/Tests/Swift/SwiftAPI/APITestBase.swift

@@ -98,8 +98,9 @@ class APITestBase: XCTestCase {
         config.configRealtime = RealtimeMocks.mockRealtime(config.configRealtime)
       }
       fakeConsole = FakeConsole()
-      config.configFetch.fetchSession = URLSessionMock(with: fakeConsole)
-      config.configFetch.disableNetworkSessionRecreation = true
+      config.configFetch.configuredFetchSessionProvider = { _ in
+        URLSessionMock(with: self.fakeConsole)
+      }
 
       fakeConsole.config = [Constants.key1: Constants.value1,
                             Constants.jsonKey: jsonValue,