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Building a Backend Application with Go

Authentication Feature Testing in GraphQL

Learn how to test the authentication features in the GraphQL application.

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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 ...