basetestcase.java

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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.io.File;
import java.io.IOException;

import junit.framework.TestCase;

import org.apache.oro.text.perl.Perl5Util;
import org.apache.velocity.runtime.RuntimeSingleton;
import org.apache.velocity.util.StringUtils;

/**
 * Base test case that provides a few utility methods for
 * the rest of the tests.
 *
 * @author <a href="mailto:[e-mail]">Daniel Rall</a>
 * @version $Id: BaseTestCase.java 490718 2006-12-28 13:35:49Z wglass $
 */
public abstract class BaseTestCase
        extends TestCase
        implements TemplateTestBase
{
    /**
     *  used for nomalization of output and compare data
     */
    private Perl5Util perl = new Perl5Util();

    /**
     * Default constructor.
     */
    public BaseTestCase(String name)
    {
        super(name);
    }

    /**
     * Concatenates the file name parts together appropriately.
     *
     * @return The full path to the file.
     */
    protected static String getFileName (final String dir, final String base, final String ext)
    {
        return getFileName(dir, base, ext, false);
    }

    protected static String getFileName (final String dir, final String base, final String ext, final boolean mustExist)
    {
        StringBuffer buf = new StringBuffer();

        try
        {
            File baseFile = new File(base);

            if (dir != null)
            {
                if (!baseFile.isAbsolute())
                {
                    baseFile = new File(dir, base);
                }

                buf.append(baseFile.getCanonicalPath());
            }
            else
            {
                buf.append(baseFile.getPath());
            }

            if (org.apache.commons.lang.StringUtils.isNotEmpty(ext))
            {
                buf.append('.').append(ext);
            }

            if (mustExist)
            {
                File testFile = new File(buf.toString());

                if (!testFile.exists())
                {
                    fail("getFileName() result " + testFile.getPath() + " does not exist!");
                }

                if (!testFile.isFile())
                {
                    fail("getFileName() result " + testFile.getPath() + " is not a file!");
                }
            }
        }
        catch (IOException e)
        {
            fail("IO Exception while running getFileName(" + dir + ", " + base + ", "+ ext + ", " + mustExist + "): " + e.getMessage());
        }

        return buf.toString();
    }

    /**
     * Assures that the results directory exists.  If the results directory
     * cannot be created, fails the test.
     */
    protected static void assureResultsDirectoryExists (String resultsDirectory)
    {
        File dir = new File(resultsDirectory);
        if (!dir.exists())
        {
            RuntimeSingleton.getLog().info("Template results directory does not exist");
            if (dir.mkdirs())
            {
                RuntimeSingleton.getLog().info("Created template results directory");
            }
            else
            {
                String errMsg = "Unable to create template results directory";
                RuntimeSingleton.getLog().warn(errMsg);
                fail(errMsg);
            }
        }
    }


    /**
     * Normalizes lines to account for platform differences.  Macs use
     * a single \r, DOS derived operating systems use \r\n, and Unix
     * uses \n.  Replace each with a single \n.
     *
     * @author <a href="mailto:[e-mail]">Sam Ruby</a>
     * @return source with all line terminations changed to Unix style
     */
    protected String normalizeNewlines (String source)
    {
        return perl.substitute("s/\r[\r]?[\n]/\n/g", source);
    }

    /**
     * Returns whether the processed template matches the
     * content of the provided comparison file.
     *
     * @return Whether the output matches the contents
     *         of the comparison file.
     *
     * @exception Exception Test failure condition.
     */
    protected boolean isMatch (String resultsDir,
                               String compareDir,
                               String baseFileName,
                               String resultExt,
                               String compareExt)
        throws Exception
    {
        String result = StringUtils.fileContentsToString
                (getFileName(resultsDir, baseFileName, resultExt, true));

        return isMatch(result,compareDir,baseFileName,compareExt);
    }

    
    /**
     * Returns whether the processed template matches the
     * content of the provided comparison file.
     *
     * @return Whether the output matches the contents
     *         of the comparison file.
     *
     * @exception Exception Test failure condition.
     */
    protected boolean isMatch (
                               String result,
                               String compareDir,
                               String baseFileName,
                               String compareExt)
        throws Exception
    {
        String compare = StringUtils.fileContentsToString
                (getFileName(compareDir, baseFileName, compareExt, true));

        /*
         *  normalize each wrt newline
         */

        return normalizeNewlines(result).equals(
                           normalizeNewlines( compare ) );
    }

        /**
     * Turns a base file name into a test case name.
     *
     * @param s The base file name.
     * @return  The test case name.
     */
    protected  static final String getTestCaseName (String s)
    {
        StringBuffer name = new StringBuffer();
        name.append(Character.toTitleCase(s.charAt(0)));
        name.append(s.substring(1, s.length()).toLowerCase());
        return name.toString();
    }
}