added tests for ssgulnur, createFolder and parseJSON functions

test/unit/__snapshots__/options.test.js.snap

@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`test the main function with bad values check if calling a function with bad value will match snapshot 1`] = `undefined`;

test/unit/helper.test.js

@@ -1,4 +1,4 @@
-const { checkSource } = require('../../src/helper');
+const { checkSource, createFolder, parseJSON } = require('../../src/helper');
 
 describe('checkSource', () => {
   test('invalid path should return "none"', () => {
@@ -13,3 +13,13 @@ describe('checkSource', () => {
     expect(checkSource('test/unit/helper.test.js')).toBe('file');
   });
 });
+
+describe('testing functions for output', () => {
+  test('nothing passed to function should return false', () => {
+    expect(createFolder()).toBeFalsy();
+  });
+
+  test('wrong path passed to function should return null', () => {
+    expect(parseJSON('wrong path')).toBe(null);
+  });
+});

test/unit/options.test.js

@@ -0,0 +1,11 @@
+const ssgulnur = require('../../src/options');
+
+describe('test the main function with bad values', () => {
+  test('return false if bad argument is passed to a function', () => {
+    expect(ssgulnur('')).toBeFalsy();
+  });
+
+  test('check if calling a function with bad value will match snapshot', () => {
+    expect(ssgulnur('Bad value')).toMatchSnapshot();
+  });
+});