mail/internet/FoldTest.java

/*
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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 * GPL Classpath Exception:
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package javax.mail.internet;

import java.io.*;
import java.util.*;
import javax.mail.internet.MimeUtility;

import org.junit.Test;
import org.junit.Assert;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

/**
 * Test header folding.
 *
 * @author Bill Shannon
 */

@RunWith(Parameterized.class)
public class FoldTest {
    private String direction;
    private String orig;
    private String expect;

    private static List<Object[]> testData;

    public FoldTest(String direction, String orig, String expect) {
    this.direction = direction;
    this.orig = orig;
    this.expect = expect;
    }

    @Parameters
    public static Collection<Object[]> data() throws IOException {
    testData = new ArrayList<Object[]>();
    parse(new BufferedReader(new InputStreamReader(
        FoldTest.class.getResourceAsStream("folddata"))));
    return testData;
    }

    /**
     * Read the data from the test file.  Format is multiple of any of
     * the following:
     *
     * FOLD\nString$\nEXPECT\nString$\n
     * UNFOLD\nString$\nEXPECT\nString$\n
     * BOTH\nString$\n
     */
    private static void parse(BufferedReader in) throws IOException {
    String line;
    while ((line = in.readLine()) != null) {
        if (line.startsWith("#") || line.length() == 0)
        continue;
        String orig = readString(in);
        if (line.equals("BOTH")) {
        testData.add(new Object[] { line, orig, null });
        } else {
        String e = in.readLine();
        if (!e.equals("EXPECT"))
            throw new IOException("TEST DATA FORMAT ERROR");
        String expect = readString(in);
        testData.add(new Object[] { line, orig, expect });
        }
    }
    }

    /**
     * Read a string that ends with '$', preserving all characters,
     * especially including CR and LF.
     */
    private static String readString(BufferedReader in) throws IOException {
    StringBuffer sb = new StringBuffer();
    int c;
    while ((c = in.read()) != '$')
        sb.append((char)c);
    in.readLine();  // throw away rest of line
    return sb.toString();
    }

    @Test
    public void testFold() {
    if (direction.equals("BOTH")) {
        String fs = MimeUtility.fold(0, orig);
        String us = MimeUtility.unfold(fs);
        Assert.assertEquals(orig, us);
    } else if (direction.equals("FOLD")) {
        Assert.assertEquals("Fold", expect, MimeUtility.fold(0, orig));
    } else if (direction.equals("UNFOLD")) {
        Assert.assertEquals("Unfold", expect, MimeUtility.unfold(orig));
    } else {
        Assert.fail("Unknown direction: " + direction);
    }
    }
}