Run in IDE

Intellij IDEA

IntelliJ IDEA is the IDE with the best specs2 integration for now. You can:

execute a specification by selecting its name and pressing CTRL+SHIFT+F10
execute a single example by selecting its description and pressing CTRL+SHIFT+F10

specs2 in Intellij

However passing arguments needs to be done through system properties for now. So if you need to use the xonly argument you need to pass -Dspecs2.xonly.

ScalaIDE

There is no integration of specs2 in ScalaIDE yet, but it is possible to execute specifications as JUnit tests:

import org.specs2.runner.JUnitRunner
import org.junit.runner.RunWith

@RunWith(classOf[JUnitRunner])
class MySpecification extends org.specs2.Specification { def is = s2"""
  Define your specification as usual here ...
"""
}

[some tricks described on the specs website can still be useful there when ScalaIDE struggles to find the specification classes]