1 files changed, 36 insertions, 0 deletions
diff --git a/tests/run/OrderingTest.scala b/tests/run/OrderingTest.scala
new file mode 100644
index 000000000..ad5acfa0c
--- /dev/null
+++ b/tests/run/OrderingTest.scala
@@ -0,0 +1,36 @@
+object Test extends dotty.runtime.LegacyApp {
+  def test[T](t1 : T, t2 : T)(implicit ord : Ordering[T]) = {
+    val cmp = ord.compare(t1, t2);
+    val cmp2 = ord.compare(t2, t1);
+
+    assert((cmp == 0) == (cmp2 == 0))
+    assert((cmp > 0) == (cmp2 < 0))
+    assert((cmp < 0) == (cmp2 > 0))
+  }
+
+  def testAll[T](t1 : T, t2 : T)(implicit ord : Ordering[T]) = {
+    assert(ord.compare(t1, t2) < 0)
+    test(t1, t2);
+    test(t1, t1);
+    test(t2, t2);
+  }
+
+  assert(Ordering[String].compare("australopithecus", "brontausaurus") < 0)
+  // assert(Ordering[Unit].compare((), ()) == 0)
+
+  testAll("bar", "foo");
+  testAll[Byte](0, 1);
+  testAll(false, true)
+  testAll(1, 2);
+  testAll(1.0, 2.0);
+  testAll(None, Some(1));
+  testAll[Iterable[Int]](List(1), List(1, 2));
+  testAll[Iterable[Int]](List(1, 2), List(2));
+  testAll((1, "bar"), (1, "foo"))
+  testAll((1, "foo"), (2, "bar"))
+
+  // sortBy
+  val words = "The quick brown fox jumped over the lazy dog".split(' ')
+  val result = words.sortBy(x => (x.length, x.head))
+  assert(result sameElements Array[String]("The", "dog", "fox", "the", "lazy", "over", "brown", "quick", "jumped"))
+}