1 files changed, 144 insertions, 0 deletions
diff --git a/velocity-engine-core/src/test/java/org/apache/velocity/test/IfEmptyTestCase.java b/velocity-engine-core/src/test/java/org/apache/velocity/test/IfEmptyTestCase.java
new file mode 100644
index 00000000..52631a19
--- /dev/null
+++ b/velocity-engine-core/src/test/java/org/apache/velocity/test/IfEmptyTestCase.java
@@ -0,0 +1,144 @@
+package org.apache.velocity.test;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.util.Collections;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.TreeMap;
+
+/**
+ * Used to check that empty values are properly handled in #if statements
+ */
+public class IfEmptyTestCase extends BaseTestCase
+{
+    public IfEmptyTestCase(final String name)
+    {
+        super(name);
+    }
+
+    protected void assertEmpty(Object obj)
+    {
+        context.put("obj", obj);
+        assertEvalEquals("", "#if( $obj )fail#end");
+    }
+
+    protected void assertNotEmpty(Object obj)
+    {
+        context.put("obj", obj);
+        assertEvalEquals("", "#if( !$obj )fail#end");
+    }
+
+    public void testNull()
+    {
+        assertEmpty(null);
+        assertEmpty(new NullAsString());
+        assertEmpty(new NullAsNumber());
+    }
+
+    public void testDataStructures()
+    {
+        assertEmpty(Collections.emptyMap());
+        assertEmpty(Collections.emptyList());
+        assertEmpty(new Object[]{});
+        List list = new ArrayList();
+        list.add(1);
+        assertNotEmpty(list);
+        Map map = new TreeMap();
+        map.put("foo", 1);
+        assertNotEmpty(map);
+    }
+
+    public void testString()
+    {
+        assertEmpty("");
+        assertEmpty(new EmptyAsString());
+        assertNotEmpty("hello");
+    }
+
+    public void testNumber()
+    {
+        assertEmpty(0);
+        assertEmpty(0L);
+        assertEmpty(0.0f);
+        assertEmpty(0.0);
+        assertEmpty(BigInteger.ZERO);
+        assertEmpty(BigDecimal.ZERO);
+        assertNotEmpty(1);
+        assertNotEmpty(1L);
+        assertNotEmpty(1.0f);
+        assertNotEmpty(1.0);
+        assertNotEmpty(BigInteger.ONE);
+        assertNotEmpty(BigDecimal.ONE);
+    }
+
+    public void testStringBuilder()
+    {
+        StringBuilder builder = new StringBuilder();
+        assertEmpty(builder);
+        builder.append("yo");
+        assertNotEmpty(builder);
+    }
+
+    public void testLiterals()
+    {
+        assertEvalEquals("", "#if( 0 )fail#end");
+        assertEvalEquals("", "#if( 0.0 )fail#end");
+        assertEvalEquals("", "#if( '' )fail#end");
+        assertEvalEquals("", "#if( \"\" )fail#end");
+        assertEvalEquals("", "#if( [] )fail#end");
+        assertEvalEquals("", "#if( {} )fail#end");
+
+        assertEvalEquals("", "#if( !1 )fail#end");
+        assertEvalEquals("", "#if( !1.0 )fail#end");
+        assertEvalEquals("", "#if( !'foo' )fail#end");
+        assertEvalEquals("", "#if( !\"foo\" )fail#end");
+        assertEvalEquals("", "#if( ![ 'foo' ] )fail#end");
+        assertEvalEquals("", "#if( !{ 'foo':'bar' } )fail#end");
+    }
+
+    public static class NullAsString
+    {
+        public String getAsString()
+        {
+            return null;
+        }
+    }
+
+    public static class EmptyAsString
+    {
+        public String getAsString()
+        {
+            return "";
+        }
+    }
+
+    public static class NullAsNumber
+    {
+        public String getAsNumber()
+        {
+            return null;
+        }
+    }
+
+}