RegexUtilTest.java

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package com.sun.enterprise.util;

import org.junit.Ignore;
import org.junit.Test;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

/**
 * Tests for RegexUtil class's methods.
 * @author Kedar Mhaswade
 */
public class RegexUtilTest {
    @Test
    public void testStarWithExtensionDot() {
        String[] files = new String[]{"a.txt", "b.txt", "cc.txt"};
        String glob  = "*.txt";  //this is how glob pattern matches files in files array
        String regex = RegexUtil.globToRegex(glob);
        Pattern p = Pattern.compile(regex); //this regex should match all the files
        for (String file : files) {
            Matcher m = p.matcher(file);
            assertTrue(file + " matches glob: " + glob, m.matches());
        }
    }
    @Test
    public void testStarWithoutExtensionDot() {
        String[] files = new String[]{"a.txt", "b.txt", "cc.txt"};
        String glob  = "*txt";  //this is how glob pattern matches files in files array
        String regex = RegexUtil.globToRegex(glob);
        Pattern p = Pattern.compile(regex); //this regex should match all the files
        for (String file : files) {
            Matcher m = p.matcher(file);
            assertTrue(file + " matches glob: " + glob, m.matches());
        }
    }
    @Test
    public void testStarDotStar() {
        String glob  = "*.*";  //should match only the strings that are file-name-like and have an extension
        String regex = RegexUtil.globToRegex(glob);
        Pattern p = Pattern.compile(regex); //this regex should match all the files
        String str = "a.txt"; //*.* matches this
        Matcher m = p.matcher(str);
        assertTrue(str + " matches glob: " + glob, m.matches());
        str = "noext"; //*.* should not match this
        m = p.matcher(str); //again
        assertFalse(str + " matches glob: " + glob, m.matches());
    }

    /**
     * The test that tests some abnormalities that I am going to ignore for now. For example, glob pattern
     * "*" does not match a hidden file like ".foo", but the regex returned here matches. There are
     * a few other corner cases like that that I am going to ignore. Hopefully, they don't arise in our usage.
     */
    @Test
    @Ignore
    public void cornerCases() {
        String glob = "*";
        String regex = RegexUtil.globToRegex(glob);
        String str = ".hidden";
        assertFalse(str + " matches glob: " + glob, Pattern.compile(regex).matcher(str).matches());
    }
}