Additional tests

test/factorial.test.js

@@ -19,3 +19,8 @@ test('Calculates the factorial of 4', () => {
 test('Calculates the factorial of 10', () => {
   expect(factorial(10)).toBe(3628800);
 });
+test('Throws TypeError if n < 0', () => {
+  expect(() => {
+    factorial(-1);
+  }).toThrow(TypeError);
+});

test/formatDuration.test.js

@@ -7,6 +7,9 @@ test('formatDuration is a Function', () => {
 test('Returns the human readable format of the given number of milliseconds', () => {
   expect(formatDuration(1001)).toBe('1 second, 1 millisecond');
 });
+test('Returns the human readable format of the given number of milliseconds (negative)', () => {
+  expect(formatDuration(-1001)).toBe('1 second, 1 millisecond');
+});
 test('Returns the human readable format of the given number of milliseconds', () => {
   expect(formatDuration(34325055574)).toBe(
     '397 days, 6 hours, 44 minutes, 15 seconds, 574 milliseconds'

test/fromCamelCase.test.js

@@ -13,5 +13,5 @@ test('Converts a string from camelcase', () => {
   );
 });
 test('Converts a string from camelcase', () => {
-  expect(fromCamelCase('someJavascriptProperty', '_')).toBe('some_javascript_property');
+  expect(fromCamelCase('someJavascriptProperty')).toBe('some_javascript_property');
 });

test/getType.test.js

@@ -7,3 +7,9 @@ test('getType is a Function', () => {
 test('Returns the native type of a value', () => {
   expect(getType(new Set([1, 2, 3]))).toBe('set');
 });
+test('Returns null for null', () => {
+  expect(getType(null)).toBe('null');
+});
+test('Returns undefined for undefined', () => {
+  expect(getType(undefined)).toBe('undefined');
+});

test/removeVowels.test.js

@@ -4,3 +4,9 @@ const {removeVowels} = require('./_30s.js');
 test('removeVowels is a Function', () => {
   expect(removeVowels).toBeInstanceOf(Function);
 });
+test('Removes vowels.', () => {
+  expect(removeVowels('foobAr')).toBe('fbr');
+});
+test('Replaces vowels.', () => {
+  expect(removeVowels('foobAr', '*')).toBe('f**b*r');
+});