diff --git a/Sources/ElixxirDAppsSDK/Connection.swift b/Sources/ElixxirDAppsSDK/Connection.swift
index 473b897146f721bf656ae1617a7cb4fa92886b2d..5b7cb92078419e62f79000b66dc57849c46304b0 100644
--- a/Sources/ElixxirDAppsSDK/Connection.swift
+++ b/Sources/ElixxirDAppsSDK/Connection.swift
@@ -31,7 +31,7 @@ extension Connection {
 #if DEBUG
 extension Connection {
   public static let failing = Connection(
-    isAuthenticated: { false },
+    isAuthenticated: { fatalError("Not implemented") },
     send: .failing,
     listen: .failing
   )
diff --git a/Sources/ElixxirDAppsSDK/MessageListener.swift b/Sources/ElixxirDAppsSDK/MessageListener.swift
index 67e1fcd50d90c6c66baefa7df5a6a5abeb00c6cc..1dd74d05f25aff78216bb32be7c31dc261f58fd4 100644
--- a/Sources/ElixxirDAppsSDK/MessageListener.swift
+++ b/Sources/ElixxirDAppsSDK/MessageListener.swift
@@ -66,7 +66,7 @@ private class Listener: NSObject, BindingsListenerProtocol {
 #if DEBUG
 extension MessageListener {
   public static let failing = MessageListener { _, _, _ in
-    Data()
+    fatalError("Not implemented")
   }
 }
 #endif
diff --git a/Sources/ElixxirDAppsSDK/NetworkFollowerStatusProvider.swift b/Sources/ElixxirDAppsSDK/NetworkFollowerStatusProvider.swift
index ee8d5cc34ac46dee092b4faf8a2b664ab1f90784..b1049df732e2a2c209a0925df5cbbb14e9ec5158 100644
--- a/Sources/ElixxirDAppsSDK/NetworkFollowerStatusProvider.swift
+++ b/Sources/ElixxirDAppsSDK/NetworkFollowerStatusProvider.swift
@@ -20,7 +20,7 @@ extension NetworkFollowerStatusProvider {
 #if DEBUG
 extension NetworkFollowerStatusProvider {
   public static let failing = NetworkFollowerStatusProvider {
-    .unknown(code: -1)
+    fatalError("Not implemented")
   }
 }
 #endif
diff --git a/Sources/ElixxirDAppsSDK/NetworkWaiter.swift b/Sources/ElixxirDAppsSDK/NetworkWaiter.swift
index 2f1ac828bb23f56a8e4be1f04ce5f8ff2bf4a04e..c895104daa70bc1176a11041ca06ff6fe2bf4092 100644
--- a/Sources/ElixxirDAppsSDK/NetworkWaiter.swift
+++ b/Sources/ElixxirDAppsSDK/NetworkWaiter.swift
@@ -19,7 +19,7 @@ extension NetworkWaiter {
 #if DEBUG
 extension NetworkWaiter {
   public static let failing = NetworkWaiter { _ in
-    false
+    fatalError("Not implemented")
   }
 }
 #endif
diff --git a/Sources/ElixxirDAppsSDK/PasswordGenerator.swift b/Sources/ElixxirDAppsSDK/PasswordGenerator.swift
index f1dd47ead86911c3bd19d88cfa3572135ab69d78..4c5b978e7fd7e14ee367f437482aee25872fd655 100644
--- a/Sources/ElixxirDAppsSDK/PasswordGenerator.swift
+++ b/Sources/ElixxirDAppsSDK/PasswordGenerator.swift
@@ -20,7 +20,7 @@ extension PasswordGenerator {
 #if DEBUG
 extension PasswordGenerator {
   public static let failing = PasswordGenerator { _ in
-    Data()
+    fatalError("Not implemented")
   }
 }
 #endif