test: ensure return Result failure if email already registered

tests/@application/useCases/user/signup/signupUseCase.ts → tests/@application/useCases/user/signup/signupUseCase.spec.ts

@@ -1,7 +1,8 @@
+import { Result } from '@domain/shared/core'
 
 import { SignupUseCases } from '@application/useCases/user/signup/signUpUseCases'
 import { type IUserRepositoryContract } from '@domain/contracts/repositories/userRepository.contract'
-import { OS } from '@domain/user'
+import { type OS, UserAggregate } from '@domain/user'
 import { mock, type MockProxy } from 'jest-mock-extended'
 
 export interface IFakerDTO {
@@ -18,7 +19,7 @@ export interface IFakerDTO {
 }
 
 describe('SignUpUseCase', () => {
-  const fakeDTO = (props: IFakerDTO) => {
+  const fakeDTO = (props?: IFakerDTO) => {
     return {
       acceptedTerms: props?.acceptedTerms ?? true,
       email: props?.email ?? 'johnjoe@example.com',
@@ -45,10 +46,22 @@ describe('SignUpUseCase', () => {
     expect(signupUseCases).toBeDefined()
   })
 
-  it('Shoudl return fails if not accept the terms', async () => {
+  it('Should return fails if not accept the terms', async () => {
     const fakerDTO = fakeDTO({ acceptedTerms: false })
     const result = await signupUseCases.execute(fakerDTO)
     expect(result.isFailure).toBe(true)
     expect(result.isSuccess).toBe(false)
+    expect(result.error).toBe('Terms should be accepted')
+  })
+
+  it('Shpuld fails if user already exists for provided email', async () => {
+    jest.spyOn(userRepository, 'exist').mockResolvedValueOnce(true)
+    const fakerDTO = fakeDTO()
+    const result = await signupUseCases.execute(fakerDTO)
+
+    expect(userRepository.exist).toHaveBeenCalledWith({ email: fakerDTO.email })
+    expect(userRepository.exist).toHaveBeenCalledTimes(1)
+    expect(result.isFailure).toBe(true)
+    expect(result.isSuccess).toBe(false)
   })
 })