CODEWITHSUNDEEP
scalasbt
Bobo Amitheson
Bobo Amitheson

Reputation: 49

I am very new to Scala / SBT. Is there a test program I use to see I set everything up correctly?

I am trying to get into Scala / sbt to test things. I am just using notepad++ and command line, no IDE.

Is there a "hello world" for tests program? I was following the sbt website example for hello world which is this: 

object Hi {
   def main(args: Array[String]) = println("Hi!")
}

Does anyone have a simple example test than I can run using SBT? I have my directories setup correctly but am still getting the hang of using SBT for basic tests and a simple example would help greatly.

Thanks.

EDIT:

I had tried using the intellij idea IDE at first with scala / sbt and scalatest to try a test example.

This is saved in the main scala directory. 

 class Hello {
   def sayHello(name: String) = s"Hello, $name!"
 }

This is saved in the test scala directory. 

 import org.scalatest.FunSuite

 class HelloTest extends FunSuite {
   test("sayHelloMethodWorks") {
     val hello = new Hello
     assert(hello.sayHello("Scala") == "Hello, Scala!")
   }
 }

This test runs fine in the IDE and it shows up as green. How would I be able to run that same test with just using command prompt / a text editor?

Upvotes: 1

Views: 178

Answers (2)

Tony Murphy
Tony Murphy

Reputation: 751

I recommend Typesafe activator. There are many templates to help get you started

run activator new

choose minimal-scal

It creates a file build.sbt

name := """hello-world-app"""

version := "1.0"

scalaVersion := "2.11.6"

// Change this to another test framework if you prefer
libraryDependencies += "org.scalatest" %% "scalatest" % "2.2.4" % "test"

// Uncomment to use Akka
//libraryDependencies += "com.typesafe.akka" %% "akka-actor" % "2.3.11"

and a scala file 

package com.example

object Hello {
  def main(args: Array[String]): Unit = {
    println("Hello, world!")
  }
}

and a test HelloWorldSpec.scala

import org.scalatest._

class HelloSpec extends FlatSpec with Matchers {
  "Hello" should "have tests" in {
    true should === (true)
  }
}

you can run sbt "~test" to continuous run your tests, or

sbt test to run test once

Upvotes: 1

bjfletcher
bjfletcher

Reputation: 11518

Welcome to the world of Scala and SBT! Excellent choice. :)

If you save that "hello world" example as hw.scala then in the same directory you can just run sbt run and it will automatically search for this source and run it.

> sbt run
[info] Set current project to hw (in build file:/Users/ben/projects/hw/)
[info] Updating {file:/Users/ben/projects/hw/}hw...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] Done updating.
[info] Compiling 1 Scala source to /Users/ben/projects/hw/target/scala-2.10/classes...
[info] Running Hi
Hi!
[success] Total time: 3 s, completed 04-Jun-2015 21:17:27
>

See this bit in the documentation for more on this.

Upvotes: 0

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