TDD with database and Go - postgresql

Question

I'm trying to wrap my head around test driven development with Go and having an issue testing my CRUD functions since they are written for my production database. I'm coming from Ruby on Rails so I am used to using a test database, but Go doesn't seem to be too friendly in this regard.
So, how does one go about testing CRUD with Go?
main.go
package main
import (
"database/sql"
)
type book struct {
id int `json:"id"`
isbn string `json:"isbn"`
title string `json:"title"`
author string `json:"author"`
price float32 `json:"price"`
}
// type Books []*Book
// CRUD functions for Book
func (b *book) getBook(db *sql.DB) error {
return db.QueryRow("SELECT * FROM books WHERE id=$1", b.id).Scan(&b)
}
app.go
func (a *App) Initialize(dbname string) {
var err error
a.DB, err = sql.Open("postgres", "postgresql://localhost:5432/bookstore?sslmode=disable")
if err != nil {
log.Fatal(err)
}
}
my test
func TestGetBook(t *testing.T) {
clearTable()
addBook(1)
req, _ := http.NewRequest("GET", "/book/1", nil)
response := executeRequest(req)
checkResponseCode(t, http.StatusOK, response.Code)
}
The problem is that this keeps on looking at the books table in my DB, not the books_test table I'd like to use for testing. How can I go about making ONLY the tests use the books_test DB?

Answer 1

You should create a dev/test database which should be a complete copy of your production database. You will never want to run test directly against your production database since too many unexpected issues could happen.
A workaround would be starting up your app first, which creates the connection to your database, then run the test. You can use IntelliJ to achieve this.
TDD in my opinion is great for developing business logic layer code since new models and business processes can have unexpected impacts on existing ones.

Answer 2

#Godzilla74, there'are 2 solutions: enable SSL for test DB (try to check database settings or ask your system administrator) of have completely different setting for test:
func (a *App) Initialize(dbname string) {
var err error
pgsettings := os.Getenv("PGSETTINGS")
if pgsettins == "" {
// default options if not overridden
pgsettins := "postgresql://localhost:5432/bookstore?sslmode=disable"
}
a.DB, err = sql.Open("postgres", pgsettins)
if err != nil {
log.Fatal(err)
}
}
So you can run set environment setting to any required value and run app, like so:
export PGSETTINGS="postgresql://localhost:5432/bookstore_test?sslmode=disable"
go run main.go