tests added for sum.test.js in implement

Author: Alex Jamshidi

Sprint-1/implement/sum.js

@@ -1,4 +1,5 @@
-function sum(elements) {
+function sum(list) {
+    return 0
 }
 
 module.exports = sum;

Sprint-1/implement/sum.test.js

@@ -10,27 +10,56 @@ const sum = require("./sum.js");
 
 // Acceptance Criteria:
 
+describe("sum", () => {
 // Given an empty array
 // When passed to the sum function
 // Then it should return 0
-test.todo("given an empty array, returns 0")
+  it("empty array returns 0", () => {
+    const list = [];
+    expect(sum(list)).toEqual(0);
+  });
 
 // Given an array with just one number
 // When passed to the sum function
 // Then it should return that number
+  it("array with one number returns number", () => {
+    const list = [1];
+    expect(sum(list)).toEqual(1);
+  });
 
 // Given an array containing negative numbers
 // When passed to the sum function
 // Then it should still return the correct total sum
 
+  it("array with negative numbers returns correct sum", () => {
+    const list = [-1, -2, -3];
+    expect(sum(list)).toEqual(-6);
+  });
+
 // Given an array with decimal/float numbers
 // When passed to the sum function
 // Then it should return the correct total sum
 
+  it("array with decimal numbers returns correct sum", () => {
+    const list = [1.1, 2.2, 3.3];
+    expect(sum(list)).toEqual(6.6);
+  });
+
 // 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
 
+  it("array with non-number values returns sum of numerical values only", () => {
+    const list = [1];
+    expect(sum(list)).toEqual(1);
+  });
+
 // 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
+
+  it("array with non-number values only returns least surprising output", () => {
+    const list = [1];
+    expect(sum(list)).toEqual(0);
+  });
+});