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Building a Backend Application with Go

Authentication Feature Testing in GraphQL

Explore how to effectively test authentication features in GraphQL backend applications using Go. Understand generating JWT tokens, preparing test data, creating test functions, and running tests for sign-up and login scenarios. This lesson helps you build reliable GraphQL authentication tests using practical examples.

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Test the application

The testing database is already prepared for testing. To create a test, we add a file called server_test.go to the project’s root directory. After the file is created, we create a function called graphQLHandler() to return the handler for the GraphQL application.

Go (1.18.2)
func graphQLHandler() *chi.Mux {
    // create a new router or handler
    var handler *chi.Mux = NewGraphQLHandler()
    // connect to the test database
   err := database.Connect(utils.GetValue("DATABASE_TEST_NAME"))
    // if connecting to the database failed, print out the error
    if err != nil {
        log.Fatalf("Cannot connect to the test database: %v\n", err)
    }
    fmt.Println("Connected to the test database")
    // return the handler
    return handler
}

Below is an explanation of the code above:

  • In line 3, the application router is created with the NewGraphQLHandler() function.

  • In line 6, the testing database is connected with the Connect() function.

  • In line 16, the handler is returned.

Next, we create a function called getJWTToken() to generate a JWT token for testing features that require authentication, like creating a new blog.

Go (1.18.2)
func getJWTToken(user model.User) string {
    // generate JWT token
    token, err := utils.GenerateNewAccessToken(user.ID)
    // if token generation failed, return an error
    if err != nil {
        panic(err)
    }
    // return the JWT token for the authorization header
    return "Bearer " + token
}

As seen in the code above, the JWT token is generated with GenerateNewAccessToken() with the ID of the user as a parameter. If the token generation is successful, the JWT token is returned ...