diff --git a/api/tests/helper.test.ts b/api/tests/helper.test.ts
index 616787201..f7adb2ec2 100644
--- a/api/tests/helper.test.ts
+++ b/api/tests/helper.test.ts
@@ -3,36 +3,47 @@ import * as helper from '../src/common/helper'
 
 describe('Test string to boolean', () => {
   it('should convert a string to boolean', () => {
+    // test success (true)
     expect(helper.StringToBoolean('true')).toBeTruthy()
+    // test success (false)
     expect(helper.StringToBoolean('false')).toBeFalsy()
+    // test success (falsy value)
     expect(helper.StringToBoolean('')).toBeFalsy()
   })
 })
 
 describe('Test join url', () => {
   it('should join two url parts', () => {
+    // test success (second part starts with slash)
     expect(helper.joinURL('part1/', '/part2')).toBe('part1/part2')
+    // test success (first part not ending with slash)
     expect(helper.joinURL('part1', '/part2')).toBe('part1/part2')
+    // test success (second part not starting with slash)
     expect(helper.joinURL('part1/', 'part2')).toBe('part1/part2')
   })
 })
 
 describe('Test clone', () => {
   it('should clone an object or an array', () => {
+    // test success (object)
     expect(helper.clone({ foo: 'bar' })).toStrictEqual({ foo: 'bar' })
+    // test success (array)
     expect(helper.clone([1, 2, 3])).toStrictEqual([1, 2, 3])
   })
 })
 
 describe('Test trim', () => {
   it('should test trim', () => {
+    // test success (begins and ends with spaces)
     expect(helper.trim('   xxxxxxxx   ', ' ')).toBe('xxxxxxxx')
   })
 })
 
 describe('Test getStripeLocale', () => {
   it('should test getStripeLocale', () => {
+    // test success (value found)
     expect(helper.getStripeLocale('en')).toBe('en')
+    // test success (value not found so should return default one)
     expect(helper.getStripeLocale('')).toBe('auto')
   })
 })