dedupe.test.js

const dedupe = require("./dedupe.js");
/*
Dedupe Array

📖 Dedupe means **deduplicate**

In this kata, you will need to deduplicate the elements of an array

E.g. dedupe(['a','a','a','b','b','c']) returns ['a','b','c']
E.g. dedupe([5, 1, 1, 2, 3, 2, 5, 8]) returns [5, 1, 2, 3, 8]
E.g. dedupe([1, 2, 1]) returns [1, 2]
*/

// Acceptance Criteria:

// Given an empty array
// When passed to the dedupe function
// Then it should return an empty array
//test.todo("given an empty array, it returns an empty array");

describe("dedupejs", () => {
  test.each([
    { input: [""], expected: [""] },

    // Given an array with no duplicates
    // When passed to the dedupe function
    // Then it should return a copy of the original array

    { input: [1, 2, 3], expected: [1, 2, 3] },

    // Given an array of strings or numbers
    // When passed to the dedupe function
    // Then it should return a new array with duplicates removed while preserving the
    // first occurrence of each element from the original array.

    { input: [1, 2, 2, 3], expected: [1, 2, 3] },
    { input: [1, "a", 2, "a"], expected: [1, "a", 2] },
    { input: ["b", "c", "d", "e"], expected: ["b", "c", "d", "e"] },
  ])("removes duplicates from $input", ({ input, expected }) => {
    expect(dedupe(input)).toEqual(expected);
  });
});