1 files changed, 69 insertions, 0 deletions
diff --git a/test/junit/scala/collection/TraversableLikeTest.scala b/test/junit/scala/collection/TraversableLikeTest.scala
new file mode 100644
index 0000000000..f703abf3e4
--- /dev/null
+++ b/test/junit/scala/collection/TraversableLikeTest.scala
@@ -0,0 +1,69 @@
+package scala.collection
+
+import org.junit.Assert._
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.junit.runners.JUnit4
+
+object TraversableLikeTest {
+  abstract class FakeIndexedSeq[A] extends IndexedSeq[A] {
+    def apply(i: Int): A = ???
+    def length: Int = 0
+  }
+}
+
+@RunWith(classOf[JUnit4])
+class TraversableLikeTest {
+  import TraversableLikeTest._
+
+  // For test_SI9019; out here because as of test writing, putting this in a method would crash compiler
+  class Baz[@specialized(Int) A]() extends IndexedSeq[A] {
+    def apply(i: Int) = ???
+    def length: Int = 0
+  }
+
+  @Test
+  def test_SI9019 {
+    object Foo {
+      def mkBar = () => {
+        class Bar extends FakeIndexedSeq[Int]
+        new Bar
+      }
+
+      def mkFalsePositiveToSyntheticTest = () => {
+        /* A class whose name tarts with an ASCII lowercase letter.
+         * It will be a false positive to the synthetic-part test.
+         */
+        class falsePositive extends FakeIndexedSeq[Int]
+        new falsePositive
+      }
+
+      def mkFrench = () => {
+        // For non-French speakers, this means "strange class name"
+        class ÉtrangeNomDeClasse extends FakeIndexedSeq[Int]
+        new ÉtrangeNomDeClasse
+      }
+
+      def mkFrenchLowercase = () => {
+        class étrangeNomDeClasseMinuscules extends FakeIndexedSeq[Int]
+        new étrangeNomDeClasseMinuscules
+      }
+    }
+
+    val bar = Foo.mkBar()
+    assertEquals("Bar", bar.stringPrefix)  // Previously would have been outermost class, TraversableLikeTest
+
+    val baz = new Baz[Int]()
+    assertEquals("TraversableLikeTest.Baz", baz.stringPrefix)  // Make sure we don't see specialization $mcI$sp stuff
+
+    // The false positive unfortunately produces an empty stringPrefix
+    val falsePositive = Foo.mkFalsePositiveToSyntheticTest()
+    assertEquals("", falsePositive.stringPrefix)
+
+    val french = Foo.mkFrench()
+    assertEquals("ÉtrangeNomDeClasse", french.stringPrefix)
+
+    val frenchLowercase = Foo.mkFrenchLowercase()
+    assertEquals("étrangeNomDeClasseMinuscules", frenchLowercase.stringPrefix)
+  }
+}