fix misleading method name in test

Author: SethTisue

src/test/scala/scala/collection/immutable/TestLazyListExtensions.scala

@@ -20,10 +20,10 @@ import next._
 class TestLazyListExtensions {
 
   // This method will *not* terminate for non-cyclic infinite-sized collections.
-  def assertIsCyclical[T](xs: LazyList[T]): Unit = {
-    assertTrue(xs.nonEmpty)
+  def assertConstantMemory[T](xs: LazyList[T]): Unit =
+    // `force` does cycle detection, so if this terminates, the collection is
+    // either finite or a cycle
     xs.force
-  }
 
   @Test
   def testEmpty1(): Unit = {
@@ -46,7 +46,7 @@ class TestLazyListExtensions {
     val xs = LazyList(1, 2, 3)
     val cyc = xs.cycle
     assertFalse(cyc.isEmpty)
-    assertIsCyclical(cyc)
+    assertConstantMemory(cyc)
     assertEquals(LazyList(1, 2, 3, 1, 2, 3, 1, 2), cyc.take(8))
   }
   @Test
@@ -88,13 +88,13 @@ class TestLazyListExtensions {
   def testConstantMemory3(): Unit = {
     val xs = LazyList(1, 2, 3)
     val cyc = xs.cycle
-    assertIsCyclical(cyc)
-    assertIsCyclical(cyc.tail)
-    assertIsCyclical(cyc.tail.tail)
-    assertIsCyclical(cyc.tail.tail.tail)
-    assertIsCyclical(cyc.tail.tail.tail.tail)
-    assertIsCyclical(cyc.drop(1))
-    assertIsCyclical(cyc.drop(10))
+    assertConstantMemory(cyc)
+    assertConstantMemory(cyc.tail)
+    assertConstantMemory(cyc.tail.tail)
+    assertConstantMemory(cyc.tail.tail.tail)
+    assertConstantMemory(cyc.tail.tail.tail.tail)
+    assertConstantMemory(cyc.drop(1))
+    assertConstantMemory(cyc.drop(10))
   }
   @Test
   def testUnbounded(): Unit = {