Fix: Compare result against hardcoded value in dedupe copy test

Author: Eugenie-A

Sprint-1/implement/dedupe.test.js

@@ -26,12 +26,10 @@ test("given an empty array, it returns an empty array", () => {
 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 the contents match a hardcoded expected value, not the input itself
+  expect(result).toEqual([1, 2, 3]);
   // Check it's a different array, not the same reference
   expect(result).not.toBe(input);
-  // Check that a duplicate input is correctly deduped in the result
-  expect(dedupe([1, 1, 2, 3])).toEqual([1, 2, 3]);
 });
 
 // Given an array with strings or numbers