svn commit: r1026319 - /lucene/dev/trunk/lucene/src/test/org/apache/lucene/util/automaton/TestBasicOperations.java

[rm...@apache.org]

Author: rmuir
Date: Fri Oct 22 13:31:08 2010
New Revision: 1026319

URL: http://svn.apache.org/viewvc?rev=1026319&view=rev
Log:
LUCENE-2717: add an explicit test for this

Modified:
    lucene/dev/trunk/lucene/src/test/org/apache/lucene/util/automaton/TestBasicOperations.java

Modified: lucene/dev/trunk/lucene/src/test/org/apache/lucene/util/automaton/TestBasicOperations.java
URL: http://svn.apache.org/viewvc/lucene/dev/trunk/lucene/src/test/org/apache/lucene/util/automaton/TestBasicOperations.java?rev=1026319&r1=1026318&r2=1026319&view=diff
==============================================================================
--- lucene/dev/trunk/lucene/src/test/org/apache/lucene/util/automaton/TestBasicOperations.java (original)
+++ lucene/dev/trunk/lucene/src/test/org/apache/lucene/util/automaton/TestBasicOperations.java Fri Oct 22 13:31:08 2010
@@ -56,6 +56,13 @@ public class TestBasicOperations extends
     assertTrue(BasicOperations.sameLanguage(other, concat2));
   }
   
+  /** Test concatenation with empty language returns empty */
+  public void testEmptyLanguageConcatenate() {
+    Automaton a = BasicAutomata.makeString("a");
+    Automaton concat = BasicOperations.concatenate(a, BasicAutomata.makeEmpty());
+    assertTrue(BasicOperations.isEmpty(concat));
+  }
+  
   /** Test optimization to concatenate() with empty String to an NFA */
   public void testEmptySingletonNFAConcatenate() {
     Automaton singleton = BasicAutomata.makeString("");