How can i test the nestjs-graphql resolver with guard? - unit-testing

Question

This is a sample code of resolver and i want to test this with the jest on nestJS.
#Resolver()
export class UserResolver {
constructor(private readonly userService: UserService) {}
#UseGuards(GqlAccessGuard)
#Query(() => User)
async fetchUser(#CurrentUser() currentUser: ICurrentUser) {
return this.userService.findUserById({ id: currentUser.id });
}
#Mutation(() => User)
async createUser(#Args('createUserInput') createUserInput: CreateUserInput) {
return this.userService.create(createUserInput);
}
}
When I'm trying to test the "fetchUser" api of this resolver I'm stucked with the #UseGuard(). I don't know how can i import or provide the 'GQlAccessGuard' into the test code. Since I use the NestJs to build Graphql-codefirst server I used custom guard that extends AuthGuards to convert Context that request has.
export class GqlAccessGuard extends AuthGuard('access') {
getRequest(context: ExecutionContext) {
const ctx = GqlExecutionContext.create(context);
return ctx.getContext().req;
}
}
#Injectable()
export class JwtAccessStrategy extends PassportStrategy(Strategy, 'access') {
constructor() {
super({
jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
ignoreExpiration: false,
secretOrKey: 'jwt-access-token-key',
});
}
async validate(payload: any) {
return {
id: payload.sub,
email: payload.email,
role: payload.role,
};
}
}
const createUserInput: CreateUserInput = {
email: 'test#gmail.com',
name: 'test',
password: 'testpwd',
phone: '010-1234-5678',
role: Role.USER,
};
class MockGqlGuard extends AuthGuard('access') {
getRequest(context: ExecutionContext) {
const ctx = GqlExecutionContext.create(context);
return ctx.getContext().req;
}
}
describe('UserResolver', () => {
let userResolver: UserResolver;
beforeEach(async () => {
const moduleRef = await Test.createTestingModule({
imports: [JwtModule.register({})],
providers: [UserResolver, JwtAccessStrategy],
})
.useMocker((token) => {
if (token === UserService) {
return {
create: jest.fn().mockReturnValue({
id: 'testuuid',
email: 'test#gmail.com',
name: 'test',
password: 'testpwd',
phone: '010-1234-5678',
role: Role.USER,
}),
};
}
})
.overrideGuard(GqlAccessGuard)
.useValue(MockGqlGuard)
.compile();
userResolver = moduleRef.get<UserResolver>(UserResolver);
});
describe('create', () => {
it('should return user created', async () => {
const result: User = {
id: 'testuuid',
email: 'test#gmail.com',
name: 'test',
password: 'testpwd',
phone: '010-1234-5678',
role: Role.USER,
};
expect(await userResolver.createUser(createUserInput)).toStrictEqual(
result,
);
});
});
});
I'm so curious about this and spent several days to search about it. also want to know how can i deal with the customized decorator(createParamDecorator that i made) to use on the test code.
please help me on this and provide me with some references.