velocity-engine-core/src/test/java/org/apache/velocity/test/DefineTestCase.java

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.
 */


/**
 * This class tests the #define directive
 */
public class DefineTestCase extends BaseTestCase
{
    public DefineTestCase(String name)
    {
       super(name);
    }

    protected String defAndEval(String block)
    {
        return defAndEval("def", block);
    }

    protected String defAndEval(String key, String block)
    {
        return evaluate("#define( $"+key+" )"+block+"#end$"+key);
    }

    public void testSimple()
    {
        assertEquals("abc", defAndEval("abc"));
        assertEvalEquals("abc abc abc", "#define( $a )abc#end$a $a $a");
    }

    public void testNotSimple()
    {
        assertEquals("true", defAndEval("#if( $def )true#end"));
        assertEquals("123", defAndEval("#foreach( $i in [1..3] )$i#end"));
        assertEquals("hello world", defAndEval("#macro( test )hello world#end#test()"));
    }

    public void testOverridingDefinitionInternally()
    {
        assertEvalEquals("truefalse", "#define( $or )true#set( $or = false )#end$or$or");
    }

    public void testLateBinding()
    {
        context.put("baz", "foo");
        assertEvalEquals("foobar", "#define( $lb )$baz#end${lb}#set( $baz = 'bar' )${lb}");
    }

    public void testRerendering()
    {
        context.put("inc", new Inc());
        assertEvalEquals("1 2 3", "#define( $i )$inc#end$i $i $i");
    }

    public void testAssignation()
    {
        assertEvalEquals("[][hello]","#define( $orig )hello#end[#set( $assig = $orig )][$assig]");
    }

    public void testNonRenderingUsage()
    {
        String template = "#define($foo)\n" +
                          " foo_contents\n" +
                          "#end\n" +
                          "#if ($foo)\n" +
                          " found foo\n" +
                          "#end";
        assertEvalEquals(" found foo\n", template);
    }

    public void testRecursionLimit()
    {
        try
        {
            assertEvalEquals("$r", "#define( $r )$r#end$r");
        }
        catch (Exception t)
        {
            fail("Recursion should not have thrown an exception");
        }
        catch (Error e)
        {
            fail("Infinite recursion should not be possible.");
        }
    }

    public void testThingsOfQuestionableMorality()
    {
        // redefining $foo within $foo
        assertEquals("foobar", defAndEval("foo", "foo#define( $foo )bar#end$foo"));
    }


    public static class Inc
    {
        int foo = 1;
        public String toString()
        {
            return String.valueOf(foo++);
        }
    }
}