Re-add scripted test

sbt/src/sbt-test/project/global-plugin/changes/Build.scala

@@ -0,0 +1,21 @@
+import sbt._
+import sbt.Keys._
+
+object MyBuild extends Build {
+  lazy val mySettings = Defaults.defaultSettings ++ Seq(
+    name := "my-test-proj",
+    organization := "com.example",
+    check <<= update map checkVersion,
+    version := "0.1.0-SNAPSHOT")
+
+  lazy val proj = Project("my-test-proj", file("."), settings = mySettings)
+
+  lazy val check = taskKey[Unit]("Verifies that the junit dependency has the newer version (4.8)")
+
+  def checkVersion(report: UpdateReport) {
+    for(mod <- report.allModules) {
+      if(mod.name == "junit") assert(mod.revision == "4.8", s"JUnit version (${mod.revision}) does not have the correct version")
+    }
+  }
+}
+

sbt/src/sbt-test/project/global-plugin/changes/global-plugins.sbt

@@ -0,0 +1,3 @@
+// use a small java library instead of a plugin to avoid incompatibilities when upgrading
+// This version should be overridden by the one in the project.
+libraryDependencies += "junit" % "junit" % "4.5"

sbt/src/sbt-test/project/global-plugin/changes/plugins.sbt

@@ -0,0 +1,2 @@
+// the version should override the one from the global plugin
+libraryDependencies += "junit" % "junit" % "4.8"

sbt/src/sbt-test/project/global-plugin/test

@@ -1,4 +1,18 @@
-# tests that a source file in $sbt.global.base/plugins/ is available to the build definition in project/
+$ copy-file changes/Build.scala project/Build.scala
+> reload
 
-# dummy to ensure project gets loaded
+# ensure that a new global dependency gets picked up
-> name
+$ copy-file changes/global-plugins.sbt global/plugins/plugins.sbt
+> reload
+
+# check that the class can be loaded
+> eval Class.forName("org.junit.Test")
+
+# check that it is on the classpath
+> eval (x => ()) : (org.junit.Test => Unit)
+
+# ensure that the global plugin version is overridden by the local version
+# (because it's older)
+$ copy-file changes/plugins.sbt project/plugins.sbt
+> reload
+> check