Add test for `releaseNotesURL`

sbt-app/src/sbt-test/dependency-management/make-pom/build.sbt

@@ -5,7 +5,9 @@ lazy val root = (project in file(".")) settings (
   TaskKey[Unit]("checkPom") := checkPom.value,
   TaskKey[Unit]("checkExtra") := checkExtra.value,
   TaskKey[Unit]("checkVersionPlusMapping") := checkVersionPlusMapping.value,
+  TaskKey[Unit]("checkReleaseNotesURL") := checkReleaseNotesURL.value,
   resolvers += Resolver.sonatypeRepo("snapshots"),
+  releaseNotesURL := Some(url("https://github.com/sbt/sbt/releases")),
   makePomConfiguration := {
     val p = makePomConfiguration.value
     p.withExtra(<extra-tag/>)
@@ -46,6 +48,11 @@ lazy val checkVersionPlusMapping = (readPom) map { (pomXml) =>
   ()
 }
 
+lazy val checkReleaseNotesURL = (readPom) map { (pomXml) =>
+  val notes = pomXml \ "properties" \ "info.releaseNotesUrl"
+  if (notes.isEmpty) sys.error("'releaseNotesUrl' not found in generated pom.xml.") else ()
+}
+
 lazy val checkPom = Def task {
   val pomXML = readPom.value
   checkProject(pomXML)

sbt-app/src/sbt-test/dependency-management/make-pom/test

@@ -1,3 +1,4 @@
 > checkPom
 > checkExtra
 > checkVersionPlusMapping
+> checkReleaseNotesURL