test different values of sum

Author: nahommesfin77

Sprint-1/implement/sum.test.js

@@ -13,24 +13,44 @@ 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")
+describe("sum", () => {
+  test("given an empty array, returns 0", () => {
+    expect(sum([])).toBe(0);
+  });
+
 
 // Given an array with just one number
 // When passed to the sum function
 // Then it should return that number
+ test("given an array with just one number, returns that number", () => {
+    expect(sum([4])).toBe(4);
+  });
 
 // Given an array containing negative numbers
 // When passed to the sum function
 // Then it should still return the correct total sum
+test("given an array containing negative numbers, returns the correct total sum", () => {
+    expect(sum([10, -5, -15])).toBe(-10);
+  });
 
 // Given an array with decimal/float numbers
 // When passed to the sum function
 // Then it should return the correct total sum
+test("given an array with decimal/float numbers, returns the correct total sum", () => {
+    expect(sum([1.5, 2.5, 3])).toBe(7);
+  });
 
 // Given an array containing non-number values
 // When passed to the sum function
 // Then it should ignore the non-numerical values and return the sum of the numerical elements
+ test("given an array containing non-number values, ignores them and returns the sum of the numerical elements", () => {
+    expect(sum([10, "hi", 20, null, 5])).toBe(35);
+  });
 
 // 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("given an array with only non-number values, returns 0", () => {
+    expect(sum(["a", "b", null, undefined])).toBe(0);
+  });
+});