Test cleanup and fixes [c-d]

test/factorial/factorial.test.js

@@ -5,9 +5,19 @@ const factorial = require('./factorial.js');
   test('factorial is a Function', () => {
   expect(factorial).toBeInstanceOf(Function);
 });
-  t.equal(factorial(6), 720, "Calculates the factorial of 720");
-  t.equal(factorial(0), 1, "Calculates the factorial of 0");
-  t.equal(factorial(1), 1, "Calculates the factorial of 1");
-  t.equal(factorial(4), 24, "Calculates the factorial of 4");
-  t.equal(factorial(10), 3628800, "Calculates the factorial of 10");
+  test('Calculates the factorial of 720', () => {
+  expect(factorial(6)).toBe(720)
+});
+  test('Calculates the factorial of 0', () => {
+  expect(factorial(0)).toBe(1)
+});
+  test('Calculates the factorial of 1', () => {
+  expect(factorial(1)).toBe(1)
+});
+  test('Calculates the factorial of 4', () => {
+  expect(factorial(4)).toBe(24)
+});
+  test('Calculates the factorial of 10', () => {
+  expect(factorial(10)).toBe(3628800)
+});