Add test from sbt/website

sbt/src/sbt-test/dependency-management/custom-config/build.sbt

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+// Custom configurations
+lazy val Common = config("common").describedAs("Dependencies required in all configurations.")
+lazy val Scalate = config("scalate").extend(Common).describedAs("Dependencies for using Scalate utilities.")
+lazy val Saxon = config("saxon").extend(Common).describedAs("Dependencies for using Saxon utilities.")
+
+// Define a customized compile configuration that includes
+// dependencies defined in our other custom configurations
+lazy val CustomCompile = config("compile").extend(Saxon, Common, Scalate)
+
+// factor out common settings
+ThisBuild / organization := "com.example"
+ThisBuild / scalaVersion := "2.10.6"
+ThisBuild / version      := "0.1.0-SNAPSHOT"
+
+// An example project that only uses the Scalate utilities.
+lazy val a = (project in file("a"))
+  .dependsOn(utils % "compile->scalate")
+
+// An example project that uses the Scalate and Saxon utilities.
+// For the configurations defined here, this is equivalent to doing dependsOn(utils),
+//  but if there were more configurations, it would select only the Scalate and Saxon
+//  dependencies.
+lazy val b = (project in file("b"))
+  .dependsOn(utils % "compile->scalate,saxon")
+
+// Defines the utilities project
+lazy val utils = (project in file("utils"))
+  .settings(
+    inConfig(Common)(Defaults.configSettings),  // Add the src/common/scala/ compilation configuration.
+    addArtifact(Common / packageBin / artifact, Common / packageBin), // Publish the common artifact
+
+    // We want our Common sources to have access to all of the dependencies on the classpaths
+    //   for compile and test, but when depended on, it should only require dependencies in 'common'
+    Common / classpathConfiguration := CustomCompile,
+
+    // Modify the default Ivy configurations.
+    // 'overrideConfigs' ensures that Compile is replaced by CustomCompile
+    ivyConfigurations := overrideConfigs(Scalate, Saxon, Common, CustomCompile)(ivyConfigurations.value),
+
+    // Put all dependencies without an explicit configuration into Common (optional)
+    defaultConfiguration := Some(Common),
+
+    // Declare dependencies in the appropriate configurations
+    libraryDependencies ++= Seq(
+      "org.fusesource.scalate" % "scalate-core" % "1.5.0" % Scalate,
+      "org.squeryl" %% "squeryl" % "0.9.5-6" % Scalate,
+      "net.sf.saxon" % "saxon" % "8.7" % Saxon
+    )
+  )

sbt/src/sbt-test/dependency-management/custom-config/test

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+> name