test(core): add dependency metadata test

Author: MyAeroCode

packages/core/test/injector/injector.spec.ts

@@ -852,4 +852,57 @@ describe('Injector', () => {
       expect(optionalDependenciesIds).to.deep.eq([1]);
     });
   });
+
+  describe('addDependencyMetadata', () => {
+    interface IInjector extends Omit<Injector, 'addDependencyMetadata'> {
+      addDependencyMetadata: (
+        keyOrIndex: symbol | string | number,
+        hostWrapper: InstanceWrapper,
+        instanceWrapper: InstanceWrapper,
+      ) => void;
+    }
+
+    let exposedInjector: IInjector;
+    let hostWrapper: InstanceWrapper;
+    let instanceWrapper: InstanceWrapper;
+
+    beforeEach(() => {
+      exposedInjector = injector as unknown as IInjector;
+      hostWrapper = new InstanceWrapper();
+      instanceWrapper = new InstanceWrapper();
+    });
+
+    it('should add dependency metadata to PropertiesMetadata when key is symbol', async () => {
+      const addPropertiesMetadataSpy = sinon.spy(
+        hostWrapper,
+        'addPropertiesMetadata',
+      );
+
+      const key = Symbol.for('symbol');
+      exposedInjector.addDependencyMetadata(key, hostWrapper, instanceWrapper);
+
+      expect(addPropertiesMetadataSpy.called).to.be.true;
+    });
+
+    it('should add dependency metadata to PropertiesMetadata when key is string', async () => {
+      const addPropertiesMetadataSpy = sinon.spy(
+        hostWrapper,
+        'addPropertiesMetadata',
+      );
+
+      const key = 'string';
+      exposedInjector.addDependencyMetadata(key, hostWrapper, instanceWrapper);
+
+      expect(addPropertiesMetadataSpy.called).to.be.true;
+    });
+
+    it('should add dependency metadata to CtorMetadata when key is number', async () => {
+      const addCtorMetadataSpy = sinon.spy(hostWrapper, 'addCtorMetadata');
+
+      const key = 0;
+      exposedInjector.addDependencyMetadata(key, hostWrapper, instanceWrapper);
+
+      expect(addCtorMetadataSpy.called).to.be.true;
+    });
+  });
 });