Fix: Add reference check to dedupe copy test

Author: Eugenie-A

Sprint-1/implement/dedupe.test.js

@@ -23,9 +23,13 @@ test("given an empty array, it returns an empty array", () => {
 // Given an array with no duplicates
 // When passed to the dedupe function
 // Then it should return a copy of the original array
-test("given an araay with no duplicates, it returns a copy of the original array", () => {
-  expect(dedupe([1, 2, 3])).toEqual([1, 2, 3]);
-  expect(dedupe(["a", "b", "c"])).toEqual(["a", "b", "c"]);
+test("given an array with no duplicates, it returns a copy of the original array", () => {
+  const input = [1, 2, 3];
+  const result = dedupe(input);
+  // Check the contents are the same
+  expect(result).toEqual(input);
+  // Check it's a different array, not the same reference
+  expect(result).not.toBe(input);
 });
 
 // Given an array with strings or numbers