Golang MongoDb GridFs Testing

Question

I have a rest API implemented using Gorilla Mux in Golang. This API uploads/downloads files from MongoDb GridFs. I want to write integration tests for my API.
Is there a embedded MongoDb package with GridFs support in Go? How do we test APIs using GridFs? Do we need to test against a real MongoDB?
Java seems to have such a library

As part of the test, I would like to start embedded MongoDB and stop it at the end of the test.

Answer 1

There is no embedded MongoDB for Go as far as I am aware of.

What I do is to use mgo's own gopkg.in/mgo.v2/dbtest which you can install as usual with

go get -u "gopkg.in/mgo.v2/dbtest"

Although it requires a mongod inside your $PATH, the dbtest takes care of all the rest.

You get a server with

package StackOverflowTests

import (
  "io/ioutil"
  "os"
  "testing"

  "gopkg.in/mgo.v2/dbtest"
)

func TestFoo(t *testing.T) {

    d, _ := ioutil.TempDir(os.TempDir(), "mongotools-test")

    server := dbtest.DBServer{}
    server.SetPath(d)

    // Note that the server will be started automagically
    session := server.Session()

    // Insert data programmatically as needed
    setupDatabaseAndCollections(session)

    // Do your testing stuff
    foo.Bar(session)
    // Whatever tests you do

    // We can not use "defer session.Close()" because...
    session.Close()

    // ... "server.Wipe()" will panic if there are still connections open
    // for example because you did a .Copy() on the
    // original session in your code. VERY useful!
    server.Wipe()

    // Tear down the server
    server.Stop()
}

Note that you neither have to define an IP or port, which are provided automagically (a free open port in the non-reserved range of localhost is used).