core/src/test/java/org/apache/james/mime4j/util/CharsetUtilTest.java

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package org.apache.james.mime4j.util;

import java.nio.charset.Charset;

import org.apache.james.mime4j.Charsets;
import org.junit.Assert;
import org.junit.Test;

public class CharsetUtilTest {

    private static final String SWISS_GERMAN_HELLO = "Gr\374ezi_z\344m\344";
    private static final String RUSSIAN_HELLO = "\u0412\u0441\u0435\u043C_\u043F\u0440\u0438\u0432\u0435\u0442";

    @Test
    public void testAllASCII() {
        String s = "Like hello and stuff";
        Assert.assertTrue(CharsetUtil.isASCII(s));
    }

    @Test
    public void testNonASCII() {
        Assert.assertFalse(CharsetUtil.isASCII(SWISS_GERMAN_HELLO));
        Assert.assertFalse(CharsetUtil.isASCII(RUSSIAN_HELLO));
    }

    @Test
    public void testCharsetLookup() {
        Charset c1 = CharsetUtil.lookup("us-ascii");
        Charset c2 = CharsetUtil.lookup("ascii");
        Assert.assertEquals(Charsets.US_ASCII, c1);
        Assert.assertEquals(Charsets.US_ASCII, c2);
    }

    @Test
    public void testCharsetLookupNullInput() {
        Charset c1 = CharsetUtil.lookup(null);
        Assert.assertNull(c1);
    }

    @Test
    public void testCharsetLookupFailure() {
        Charset c1 = CharsetUtil.lookup("whatever");
        Assert.assertNull(c1);
    }

}