1 files changed, 40 insertions, 0 deletions
diff --git a/sbt-bridge/bridge/src/sbt-test/source-dependencies/transitive-memberRef/build.sbt b/sbt-bridge/bridge/src/sbt-test/source-dependencies/transitive-memberRef/build.sbt
new file mode 100644
index 000000000..d24e304b1
--- /dev/null
+++ b/sbt-bridge/bridge/src/sbt-test/source-dependencies/transitive-memberRef/build.sbt
@@ -0,0 +1,40 @@
+logLevel := Level.Debug
+
+incOptions := incOptions.value.withNameHashing(true)
+
+// disable sbt's heauristic which recompiles everything in case
+// some fraction (e.g. 50%) of files is scheduled to be recompiled
+// in this test we want precise information about recompiled files
+// which that heuristic would distort
+incOptions := incOptions.value.copy(recompileAllFraction = 1.0)
+
+/* Performs checks related to compilations:
+ *  a) checks in which compilation given set of files was recompiled
+ *  b) checks overall number of compilations performed
+ */
+TaskKey[Unit]("check-compilations") := {
+  val analysis = (compile in Compile).value
+  val srcDir = (scalaSource in Compile).value
+  def relative(f: java.io.File): java.io.File =  f.relativeTo(srcDir) getOrElse f
+  val allCompilations = analysis.compilations.allCompilations
+  val recompiledFiles: Seq[Set[java.io.File]] = allCompilations map { c =>
+    val recompiledFiles = analysis.apis.internal.collect {
+      case (file, api) if api.compilation.startTime == c.startTime => relative(file)
+    }
+    recompiledFiles.toSet
+  }
+  def recompiledFilesInIteration(iteration: Int, fileNames: Set[String]) = {
+    val files = fileNames.map(new java.io.File(_))
+    assert(recompiledFiles(iteration) == files, "%s != %s".format(recompiledFiles(iteration), files))
+  }
+  // Y.scala is compiled only at the beginning as changes to A.scala do not affect it
+  recompiledFilesInIteration(0, Set("X.scala", "Y.scala"))
+  // A.scala is changed and recompiled
+  recompiledFilesInIteration(1, Set("A.scala"))
+  // change in A.scala causes recompilation of B.scala, C.scala, D.scala which depend on transtiviely
+  // and by inheritance on A.scala
+  // X.scala is also recompiled because it depends by member reference on B.scala
+  // Note that Y.scala is not recompiled because it depends just on X through member reference dependency
+  recompiledFilesInIteration(2, Set("B.scala", "C.scala", "D.scala"))
+  assert(allCompilations.size == 3)
+}