1 files changed, 36 insertions, 0 deletions
diff --git a/src/partest/scala/tools/partest/TestUtil.scala b/src/partest/scala/tools/partest/TestUtil.scala
new file mode 100644
index 0000000000..b86a8e2c7f
--- /dev/null
+++ b/src/partest/scala/tools/partest/TestUtil.scala
@@ -0,0 +1,36 @@
+package scala.tools.partest
+
+trait TestUtil {
+  /** Given function and block of code, evaluates code block,
+   *  calls function with nanoseconds elapsed, and returns block result.
+   */
+  def timed[T](f: Long => Unit)(body: => T): T = {
+    val start = System.nanoTime
+    val result = body
+    val end = System.nanoTime
+
+    f(end - start)
+    result
+  }
+  /** Times body and returns (nanos, result).
+   */
+  def alsoNanos[T](body: => T): (Long, T) = {
+    var nanos = 0L
+    val result = timed(nanos = _)(body)
+
+    (nanos, result)
+  }
+  def nanos(body: => Unit): Long = alsoNanos(body)._1
+
+  def verifySpeed(body1: => Unit, body2: => Unit, acceptableMultiple: Double) = {
+    val t1 = nanos(body1).toDouble
+    val t2 = nanos(body2).toDouble
+    val mult = if (t1 > t2) t1 / t2 else t2 / t1
+
+    assert(mult <= acceptableMultiple, "Performance difference too great: multiple = " + mult)
+  }
+}
+
+object TestUtil extends TestUtil {
+
+}
+\ No newline at end of file