added ability to revert (#21)

tests/unit/stubs/NumericEntityStub.ts

@@ -1,7 +1,12 @@
 import { BaseEntity } from '@/infrastructure/Entity/BaseEntity';
 
 export class NumericEntityStub extends BaseEntity<number> {
+    public customProperty = 'customProperty';
     constructor(id: number) {
         super(id);
     }
+    public withCustomProperty(value: string): NumericEntityStub {
+        this.customProperty = value;
+        return this;
+    }
 }