diff --git a/src/__tests__/Decorators.spec.ts b/src/__tests__/Decorators.spec.ts
index b3c6cdc..df90bf3 100644
--- a/src/__tests__/Decorators.spec.ts
+++ b/src/__tests__/Decorators.spec.ts
@@ -282,6 +282,7 @@ export function test_RegisterInstanceDecorator(
     Container: ITSinjex_,
     // eslint-disable-next-line @typescript-eslint/no-unsafe-function-type
     registerInstance: Function,
+    mode: 'instance' | 'standalone' = 'standalone',
 ): void {
     describe('RegisterInstance Decorator Tests', () => {
         let container: ITSinjex;
@@ -295,7 +296,10 @@ export function test_RegisterInstanceDecorator(
         });
 
         it('should register an instance of a dependency', () => {
-            @registerInstance('InstanceIdentifier')
+            @registerInstance(
+                'InstanceIdentifier',
+                mode === 'instance' ? 'instance' : undefined,
+            )
             class TestClass {
                 private readonly _dependency!: any;
 
@@ -337,7 +341,10 @@ export function test_RegisterInstanceDecorator(
         });
 
         it('should register an instance of a dependency and get it on set', () => {
-            @registerInstance('InstanceIdentifier')
+            @registerInstance(
+                'InstanceIdentifier',
+                mode === 'instance' ? 'instance' : undefined,
+            )
             class TestClass {
                 private readonly _dependency!: any;
 
diff --git a/src/__tests__/Decorators.test.ts b/src/__tests__/Decorators.test.ts
index efba3e6..28d2d54 100644
--- a/src/__tests__/Decorators.test.ts
+++ b/src/__tests__/Decorators.test.ts
@@ -1,3 +1,4 @@
+/* eslint-disable deprecation/deprecation */
 import { TSinjex } from 'src/classes/TSinjex';
 import { Inject } from 'src/decorators/Inject';
 import { Register } from 'src/decorators/Register';
@@ -13,3 +14,5 @@ test_InjectDecorator(TSinjex, Inject);
 test_RegisterDecorator(TSinjex, Register);
 
 test_RegisterInstanceDecorator(TSinjex, RegisterInstance);
+
+test_RegisterInstanceDecorator(TSinjex, Register, 'instance');