Fix StreamletImplTest unit test (#2561)

diff --git a/heron/api/tests/java/com/twitter/heron/streamlet/impl/StreamletImplTest.java b/heron/api/tests/java/com/twitter/heron/streamlet/impl/StreamletImplTest.java
index aa7dde3..d609787 100644
--- a/heron/api/tests/java/com/twitter/heron/streamlet/impl/StreamletImplTest.java
+++ b/heron/api/tests/java/com/twitter/heron/streamlet/impl/StreamletImplTest.java
@@ -265,7 +265,7 @@
   public void testResourcesBuilder() {
     Resources defaultResources = Resources.defaultResources();
     assertEquals(0, Float.compare(defaultResources.getCpu(), 1.0f));
-    assertEquals(defaultResources.getRam(), 104857600);
+    assertEquals(defaultResources.getRam(), ByteAmount.fromMegabytes(100));
 
     Resources nonDefaultResources = new Resources.Builder()
         .setCpu(5.1f)