Utf8StringBufferTest.java

package test.utils.lang;

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

import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;

import org.junit.Test;

import com.firefly.utils.lang.Utf8Appendable;
import com.firefly.utils.lang.Utf8StringBuffer;

public class Utf8StringBufferTest {
	@Test
	public void testUtfStringBuffer() throws Exception {
		String source = "abcd012345\n\r\u0000\u00a4\u10fb\ufffdjetty";
		byte[] bytes = source.getBytes(StandardCharsets.UTF_8);
		Utf8StringBuffer buffer = new Utf8StringBuffer();
		for (byte aByte : bytes)
			buffer.append(aByte);
		assertEquals(source, buffer.toString());
		assertTrue(buffer.toString().endsWith("jetty"));
	}

	@Test(expected = IllegalArgumentException.class)
	public void testUtf8WithMissingByte() throws Exception {
		String source = "abc\u10fb";
		byte[] bytes = source.getBytes(StandardCharsets.UTF_8);
		Utf8StringBuffer buffer = new Utf8StringBuffer();
		for (int i = 0; i < bytes.length - 1; i++)
			buffer.append(bytes[i]);
		buffer.toString();
	}

	@Test(expected = Utf8Appendable.NotUtf8Exception.class)
	public void testUtf8WithAdditionalByte() throws Exception {
		String source = "abcXX";
		byte[] bytes = source.getBytes(StandardCharsets.UTF_8);
		bytes[3] = (byte) 0xc0;
		bytes[4] = (byte) 0x00;

		Utf8StringBuffer buffer = new Utf8StringBuffer();
		for (byte aByte : bytes)
			buffer.append(aByte);
	}

	@Test
	public void testUTF32codes() throws Exception {
		String source = "\uD842\uDF9F";
		byte[] bytes = source.getBytes(StandardCharsets.UTF_8);

		String jvmcheck = new String(bytes, 0, bytes.length, StandardCharsets.UTF_8);
		assertEquals(source, jvmcheck);

		Utf8StringBuffer buffer = new Utf8StringBuffer();
		buffer.append(bytes, 0, bytes.length);
		String result = buffer.toString();
		assertEquals(source, result);
	}

	@Test
	public void testGermanUmlauts() throws Exception {
		byte[] bytes = new byte[6];
		bytes[0] = (byte) 0xC3;
		bytes[1] = (byte) 0xBC;
		bytes[2] = (byte) 0xC3;
		bytes[3] = (byte) 0xB6;
		bytes[4] = (byte) 0xC3;
		bytes[5] = (byte) 0xA4;

		Utf8StringBuffer buffer = new Utf8StringBuffer();
		for (int i = 0; i < bytes.length; i++)
			buffer.append(bytes[i]);

		assertEquals("\u00FC\u00F6\u00E4", buffer.toString());
	}

	@Test(expected = Utf8Appendable.NotUtf8Exception.class)
	public void testInvalidUTF8() throws UnsupportedEncodingException {
		Utf8StringBuffer buffer = new Utf8StringBuffer();
		buffer.append((byte) 0xC2);
		buffer.append((byte) 0xC2);
	}
}