Define Custom Tasks 

Define a Task that runs tests in specific sub-projects 

Consider a hypothetical multi-build project with 3 subprojects. The following defines a task myTestTask that will run the test Task in specific subprojects core and tools but not client:

``` lazy val core =”./core”))

lazy val tools =”./tools”))

lazy val client =”./client”))

lazy val myTestTask = TaskKeyUnit

myTestTask <<= Seq( test in (core, Test) test in (tools, Test) ).dependOn ```


sbt Reference Manual
    1. Define Custom Tasks