1 files changed, 138 insertions, 0 deletions
diff --git a/test/junit/scala/collection/convert/NullSafetyToJavaTest.scala b/test/junit/scala/collection/convert/NullSafetyToJavaTest.scala
new file mode 100644
index 0000000000..da0513ed8a
--- /dev/null
+++ b/test/junit/scala/collection/convert/NullSafetyToJavaTest.scala
@@ -0,0 +1,138 @@
+package scala.collection.convert
+
+import java.util.{concurrent => juc}
+import java.{lang => jl, util => ju}
+
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.junit.runners.JUnit4
+
+import scala.collection.JavaConverters._
+import scala.collection.convert.ImplicitConversions._
+import scala.collection.{concurrent, mutable}
+
+// SI-9113: tests to insure that wrappers return null instead of wrapping it as a collection
+
+@RunWith(classOf[JUnit4])
+class NullSafetyToJavaTest {
+  @Test def testIteratorWrapping(): Unit = {
+    val nullIterator: Iterator[AnyRef] = null
+    val jIterator: ju.Iterator[AnyRef] = nullIterator
+
+    assert(jIterator == null)
+  }
+
+  @Test def testEnumerationWrapping(): Unit = {
+    val nullEnumeration: Iterator[AnyRef] = null
+    val enumeration: ju.Iterator[AnyRef] = nullEnumeration
+
+    assert(enumeration == null)
+  }
+
+  @Test def testIterableWrapping(): Unit = {
+    val nullIterable: Iterable[AnyRef] = null
+    val iterable: jl.Iterable[AnyRef] = asJavaIterable(nullIterable)
+
+    assert(iterable == null)
+  }
+
+  @Test def testCollectionWrapping(): Unit = {
+    val nullCollection: Iterable[AnyRef] = null
+    val collection: ju.Collection[AnyRef] = nullCollection
+
+    assert(collection == null)
+  }
+
+  @Test def testBufferWrapping(): Unit = {
+    val nullList: mutable.Buffer[AnyRef] = null
+    val buffer: ju.List[AnyRef] = nullList
+
+    assert(buffer == null)
+  }
+
+  @Test def testSetWrapping(): Unit = {
+    val nullSet: mutable.Set[AnyRef] = null
+    val set: ju.Set[AnyRef] = nullSet
+
+    assert(set == null)
+  }
+
+  @Test def testMapWrapping(): Unit = {
+    val nullMap: mutable.Map[AnyRef, AnyRef] = null
+    val map: ju.Map[AnyRef, AnyRef] = nullMap
+
+    assert(map == null)
+  }
+
+  @Test def testConcurrentMapWrapping(): Unit = {
+    val nullConMap: concurrent.Map[AnyRef, AnyRef] = null
+    val conMap: juc.ConcurrentMap[AnyRef, AnyRef] = nullConMap
+
+    assert(conMap == null)
+  }
+
+  @Test def testDictionaryWrapping(): Unit = {
+    val nullDict: mutable.Map[AnyRef, AnyRef] = null
+    val dict: ju.Dictionary[AnyRef, AnyRef] = nullDict
+
+    assert(dict == null)
+  }
+
+  // Implicit conversion to ju.Properties is not available
+
+  @Test def testIteratorDecoration(): Unit = {
+    val nullIterator: Iterator[AnyRef] = null
+
+    assert(nullIterator.asJava == null)
+  }
+
+  @Test def testEnumerationDecoration(): Unit = {
+    val nullEnumeration: Iterator[AnyRef] = null
+
+    assert(nullEnumeration.asJavaEnumeration == null)
+  }
+
+  @Test def testIterableDecoration(): Unit = {
+    val nullIterable: Iterable[AnyRef] = null
+
+    assert(nullIterable.asJava == null)
+  }
+
+  @Test def testCollectionDecoration(): Unit = {
+    val nullCollection: Iterable[AnyRef] = null
+
+    assert(nullCollection.asJavaCollection == null)
+  }
+
+  @Test def testBufferDecoration(): Unit = {
+    val nullBuffer: mutable.Buffer[AnyRef] = null
+
+    assert(nullBuffer.asJava == null)
+  }
+
+  @Test def testSetDecoration(): Unit = {
+    val nullSet: Set[AnyRef] = null
+
+    assert(nullSet.asJava == null)
+  }
+
+  @Test def testMapDecoration(): Unit = {
+    val nullMap: mutable.Map[AnyRef, AnyRef] = null
+
+    assert(nullMap.asJava == null)
+  }
+
+  @Test def testConcurrentMapDecoration(): Unit = {
+    val nullConMap: concurrent.Map[AnyRef, AnyRef] = null
+
+    assert(nullConMap.asJava == null)
+  }
+
+  @Test def testDictionaryDecoration(): Unit = {
+    val nullDict: mutable.Map[AnyRef, AnyRef] = null
+
+    assert(nullDict.asJavaDictionary == null)
+  }
+
+  // Decorator conversion to ju.Properties is not available
+}