How to run specifications sequentially

Question

I want to create few specifications that interoperate with database.

class DocumentSpec extends mutable.Specification with BeforeAfterExample {
  sequential

  d         


        

Answer 1

I suppose you are using SBT? If so, check the documentation: http://www.scala-sbt.org/release/docs/Detailed-Topics/Parallel-Execution

The relevant SBT setting is parallelExecution. Add this to your project definition:

parallelExecution in Test := false

Answer 2

If you want to run single Specification in specs2 sequentially just add sequential method call at the beginning of your Specification. For example:

class MyTest extends Specification {
  // Set sequential execution
  sequential

  // This tests will be executed sequentially
  "my test" should {
    "add numbers" in {
      (1 + 1) should be equalTo 2
    }

    "multiply numbers" in {
      (2 * 2) should be equalTo 4
    }
  }
} 

UPDATE: As @jsears correctly mentioned in the comments, this will make tests to run sequentially in a single spec! Other specs may still run in parallel.

Answer 3

Meanwhile there is a better solution (http://www.scala-sbt.org/release/docs/Parallel-Execution.html):

sbt 0.12.0 introduces a general infrastructure for restricting task concurrency beyond the usual ordering declarations.

This configuration will run all tests sequential, also if they are in subprojects:

concurrentRestrictions in Global := Seq(
  Tags.limit(Tags.CPU, 2),
  Tags.limit(Tags.Network, 10),
  Tags.limit(Tags.Test, 1),
  Tags.limitAll( 15 )
)

I haven't tested if this can be overridden by each sub-project, so the sub-project can run its tests in parallel.