diff --git a/ts/smartexpect.classes.assertion.ts b/ts/smartexpect.classes.assertion.ts
index a18792b..aab833e 100644
--- a/ts/smartexpect.classes.assertion.ts
+++ b/ts/smartexpect.classes.assertion.ts
@@ -187,13 +187,14 @@ export class Assertion {
 
   public toContain(itemArg: any) {
     return this.runCheck(() => {
-      const result = this.baseReference instanceof Array && this.baseReference.find(itemArg2 => {
-        itemArg === itemArg2;
-      })
+      const result =
+        this.baseReference instanceof Array &&
+        this.baseReference.find((itemArg2) => {
+          itemArg === itemArg2;
+        });
       if (!result) {
         throw new Error(`${this.baseReference} is not contain ${itemArg}`);
       }
     });
-    
   }
 }