test: add unit test

Author: g-saracca

test/unit/users/RegisterUser.test.ts

@@ -0,0 +1,33 @@
+import { RegisterUser } from '../../../src/users/domain/useCases/RegisterUser'
+import { IUsersRepository } from '../../../src/users/domain/repositories/IUsersRepository'
+import { UserDTO, WriteError } from '../../../src'
+
+describe('execute', () => {
+  const testUserDTO: UserDTO = {
+    username: 'johndoe',
+    firstName: 'John',
+    lastName: 'Doe',
+    emailAddress: '[email protected]',
+    position: '',
+    affiliation: '',
+    termsAccepted: true
+  }
+
+  test('should return undefined on repository success', async () => {
+    const usersRepositoryStub: IUsersRepository = {} as IUsersRepository
+    usersRepositoryStub.registerUser = jest.fn().mockResolvedValue(undefined)
+    const testRegisterUser = new RegisterUser(usersRepositoryStub)
+
+    const actual = await testRegisterUser.execute(testUserDTO)
+
+    expect(actual).toEqual(undefined)
+  })
+
+  test('should return error result on repository error', async () => {
+    const usersRepositoryStub: IUsersRepository = {} as IUsersRepository
+    usersRepositoryStub.registerUser = jest.fn().mockRejectedValue(new WriteError())
+    const testRegisterUser = new RegisterUser(usersRepositoryStub)
+
+    await expect(testRegisterUser.execute(testUserDTO)).rejects.toThrow(WriteError)
+  })
+})