Merge pull request #4052 from Lymia/issue/8910

SI-8910 BitSet sometimes uses exponential memory.

1 files changed, 22 insertions, 0 deletions

diff --git a/test/junit/scala/collection/mutable/BitSetTest.scala b/test/junit/scala/collection/mutable/BitSetTest.scala
new file mode 100644
index 0000000000..8d164b50d4
--- /dev/null
+++ b/test/junit/scala/collection/mutable/BitSetTest.scala
@@ -0,0 +1,22 @@
+package scala.collection.mutable
+
+import org.junit.runner.RunWith
+import org.junit.runners.JUnit4
+import org.junit.{Test, Ignore}
+
+@RunWith(classOf[JUnit4])
+class BitSetTest {
+  // Test for SI-8910
+  @Test def capacityExpansionTest() {
+    val bitSet = BitSet.empty
+    val size   = bitSet.toBitMask.length
+    bitSet ^= bitSet
+    assert(bitSet.toBitMask.length == size, "Capacity of bitset changed after ^=")
+    bitSet |= bitSet
+    assert(bitSet.toBitMask.length == size, "Capacity of bitset changed after |=")
+    bitSet &= bitSet
+    assert(bitSet.toBitMask.length == size, "Capacity of bitset changed after &=")
+    bitSet &~= bitSet
+    assert(bitSet.toBitMask.length == size, "Capacity of bitset changed after &~=")
+  }
+}