1 files changed, 38 insertions, 0 deletions
diff --git a/tests/run/map_test.scala b/tests/run/map_test.scala
new file mode 100644
index 000000000..947c846bd
--- /dev/null
+++ b/tests/run/map_test.scala
@@ -0,0 +1,38 @@
+import scala.collection.immutable.{ListMap, Map, TreeMap}
+
+object Test extends dotty.runtime.LegacyApp {
+  test1()
+  test2()
+  println("OK")
+
+  def test1(): Unit = {
+    val myMap: TreeMap[Int, String] = new TreeMap
+    test_map(myMap)
+  }
+
+  def test2(): Unit = {
+    val myMap: ListMap[Int, String] = new ListMap
+    test_map(myMap)
+  }
+
+  def test_map(myMap: Map[Int, String]): Unit = {
+    val map1 = myMap.updated(42,"The answer")
+    val map2 = map1.updated(17,"A small random number")
+    val map3 = map2.updated(666,"A bigger random number")
+    val map4 = map3.updated(4711,"A big random number")
+    map1 == myMap + ((42, "The answer"))
+    var i = 0
+    var map = map4
+    while(i < 43) {
+      map = map.updated(i,i.toString())
+      i += 1
+    }
+    i = 0
+    while(i < 4712) {
+      if (map.isDefinedAt(i))
+        print(i + "->" + map(i) + " ");
+      i += 1
+    }
+    println("")
+  }
+}