LANG-1364: ExceptionUtils#getRootCause(Throwable t) should return t if no lower level cause exists

This makes the behavior of getRootCause consistent with getRootCauseMessage and getRootCauseStackTrace.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/test/java/org/apache/commons/lang3/exception/ExceptionUtilsTest.java b/src/test/java/org/apache/commons/lang3/exception/ExceptionUtilsTest.java
index d6fb98a66..0af68a8fb 100644
--- a/src/test/java/org/apache/commons/lang3/exception/ExceptionUtilsTest.java
+++ b/src/test/java/org/apache/commons/lang3/exception/ExceptionUtilsTest.java
@@ -147,10 +147,10 @@ public class ExceptionUtilsTest {
     @Test
     public void testGetRootCause_Throwable() {
         assertSame(null, ExceptionUtils.getRootCause(null));
-        assertSame(null, ExceptionUtils.getRootCause(withoutCause));
+        assertSame(withoutCause, ExceptionUtils.getRootCause(withoutCause));
         assertSame(withoutCause, ExceptionUtils.getRootCause(nested));
         assertSame(withoutCause, ExceptionUtils.getRootCause(withCause));
-        assertSame(null, ExceptionUtils.getRootCause(jdkNoCause));
+        assertSame(jdkNoCause, ExceptionUtils.getRootCause(jdkNoCause));
         assertSame(cyclicCause.getCause().getCause(), ExceptionUtils.getRootCause(cyclicCause));
     }