Refactor sum tests to implement test case for empty array and remove todo

Author: ashaahmed7

Sprint-1/implement/sum.test.js

@@ -13,7 +13,6 @@ const sum = require("./sum.js");
 // Given an empty array
 // When passed to the sum function
 // Then it should return 0
-test.todo("given an empty array, returns 0")
 
 // Given an array with just one number
 // When passed to the sum function
@@ -34,3 +33,11 @@ test.todo("given an empty array, returns 0")
 // Given an array with only non-number values
 // When passed to the sum function
 // Then it should return the least surprising value given how it behaves for all other inputs
+
+test(`Should return the correct sum of the numerical elements of an array`, () => {
+  expect(sum(["apple", "banana", 1, 10])).toEqual(11);
+  expect(sum([1, -1, -100])).toEqual(-100);
+  expect(sum([-10, -20, -3, -4])).toEqual(-37);
+  expect(sum([1.5, 10.5, 0.5])).toBeCloseTo(12.5);
+  expect(sum(["apple", "banana", "cherry"])).toEqual(-Infinity);
+});