diff --git a/interface/src/main/java/xsbti/Versions.java b/interface/src/main/java/xsbti/Versions.java
new file mode 100644
index 000000000..8576aeaf5
--- /dev/null
+++ b/interface/src/main/java/xsbti/Versions.java
@@ -0,0 +1,11 @@
+/* sbt -- Simple Build Tool
+ * Copyright 2009  Mark Harrah
+ */
+package xsbti;
+
+public interface Versions
+{
+	public static final String Sbt = "0.7";
+	public static final int Interface = 1;
+	public static final int BootInterface = 1;
+}
diff --git a/interface/src/test/scala/F0.scala b/interface/src/test/scala/F0.scala
new file mode 100644
index 000000000..d71458e68
--- /dev/null
+++ b/interface/src/test/scala/F0.scala
@@ -0,0 +1,6 @@
+package xsbti
+
+object f0
+{
+	def apply[T](s: => T) = new F0[T] { def apply = s }
+}
\ No newline at end of file
diff --git a/interface/src/test/scala/TestCallback.scala b/interface/src/test/scala/TestCallback.scala
new file mode 100644
index 000000000..7783a0df5
--- /dev/null
+++ b/interface/src/test/scala/TestCallback.scala
@@ -0,0 +1,28 @@
+package xsbti
+
+import java.io.File
+import scala.collection.mutable.ArrayBuffer
+
+class TestCallback(val superclassNames: Array[String]) extends AnalysisCallback
+{
+	val invalidSuperclasses = new ArrayBuffer[String]
+	val beganSources = new ArrayBuffer[File]
+	val endedSources = new ArrayBuffer[File]
+	val foundSubclasses = new ArrayBuffer[(File, String, String, Boolean)]
+	val sourceDependencies = new ArrayBuffer[(File, File)]
+	val jarDependencies = new ArrayBuffer[(File, File)]
+	val classDependencies = new ArrayBuffer[(File, File)]
+	val products = new ArrayBuffer[(File, File)]
+	val applications = new ArrayBuffer[(File, String)]
+
+	def superclassNotFound(superclassName: String) { invalidSuperclasses += superclassName }
+	def beginSource(source: File) { beganSources += source }
+	def foundSubclass(source: File, subclassName: String, superclassName: String, isModule: Boolean): Unit =
+		foundSubclasses += ((source, subclassName, superclassName, isModule))
+	def sourceDependency(dependsOn: File, source: File) { sourceDependencies += ((dependsOn, source)) }
+	def jarDependency(jar: File, source: File) { jarDependencies += ((jar, source)) }
+	def classDependency(clazz: File, source: File) { classDependencies += ((clazz, source)) }
+	def generatedClass(source: File, module: File) { products += ((source, module)) }
+	def endSource(source: File) { endedSources += source }
+	def foundApplication(source: File, className: String) { applications += ((source, className)) }
+}
\ No newline at end of file
diff --git a/interface/src/test/scala/TestLogger.scala b/interface/src/test/scala/TestLogger.scala
new file mode 100644
index 000000000..f78a0f533
--- /dev/null
+++ b/interface/src/test/scala/TestLogger.scala
@@ -0,0 +1,25 @@
+package xsbti
+
+class TestLogger extends Logger
+{
+	private val buffer = new scala.collection.mutable.ArrayBuffer[F0[Unit]]
+	def info(msg: F0[String]) = buffer("[info] ", msg)
+	def warn(msg: F0[String]) = buffer("[warn] ", msg)
+	def debug(msg: F0[String]) = buffer("[debug] ", msg)
+	def error(msg: F0[String]) = buffer("[error] ", msg)
+	def verbose(msg: F0[String]) = buffer("[verbose] ", msg)
+	def show() { buffer.foreach(_()) }
+	def clear() { buffer.clear() }
+	def trace(t: F0[Throwable]) { buffer += f0(t().printStackTrace) }
+	private def buffer(s: String, msg: F0[String]) { buffer += f0(println(s + msg())) }
+}
+object TestLogger
+{
+	def apply[T](f: Logger => T): T =
+	{
+		val log = new TestLogger
+		try { f(log) }
+		catch { case e: Exception => log.show(); throw e }
+		finally { log.clear() }
+	}
+}
\ No newline at end of file