diff --git a/challenge.test.js b/challenge.test.js
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+++ b/challenge.test.js
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+const { fakerAR } = require("@faker-js/faker");
+const { addReview } = require("./objects");
+
+describe("🌶️🌶️🌶️ Challenge", () => {
+  let book;
+  let newReview;
+
+  beforeEach(() => {
+    book = {
+      title: fakerAR.book.title(),
+      author: fakerAR.book.author(),
+      publishedYear: fakerAR.date.past().getFullYear(),
+      genre: fakerAR.book.genre(),
+    };
+    newReview = {
+      reviewer: fakerAR.person.fullName(),
+      comment: fakerAR.lorem.sentence(),
+    };
+  });
+
+  describe("addReview", () => {
+    it("should add a review to an exist array of reviews", () => {
+      book.reviews = [
+        {
+          reviewer: fakerAR.person.fullName(),
+          comment: fakerAR.lorem.sentence(),
+        },
+      ];
+      const { reviewer, comment } = newReview;
+      const updatedBook = addReview(book, reviewer, comment);
+      expect(updatedBook.reviews).toContainEqual(newReview);
+    });
+
+    it("should create a review array if one didn't already exist", () => {
+      const { reviewer, comment } = newReview;
+      const updatedBook = addReview(book, reviewer, comment);
+      expect(updatedBook.reviews).toContainEqual(newReview);
+    });
+  });
+});