package week04.test;
import java.io.IOException;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import week04.minijvm.loader.ClassFileLoader;
public class ClassFileloaderTest {
static String path1 = "D:\\Git_2017\\coding2017\\group01\\1298552064\\bin";
static String path2 = "C:\\temp";
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void testClassPath() {
ClassFileLoader loader = new ClassFileLoader();
loader.addClassPath(path1);
loader.addClassPath(path2);
String clzPath = loader.getClassPath();
Assert.assertEquals(path1 + ";" + path2, clzPath);
}
@Test
public void testClassFileLength() throws IOException {
ClassFileLoader loader = new ClassFileLoader();
loader.addClassPath(path1);
String className = "week04.test.EmployeeV1";
byte[] byteCodes = loader.readBinaryCode(className);
// 注意:这个字节数可能和你的JVM版本有关系, 你可以看看编译好的类到底有多大
Assert.assertEquals(1032, byteCodes.length);
}
@Test
public void testMagicNumber() throws IOException {
ClassFileLoader loader = new ClassFileLoader();
loader.addClassPath(path1);
String className = "week04.test.EmployeeV1";
byte[] byteCodes = loader.readBinaryCode(className);
byte[] codes = new byte[] { byteCodes[0], byteCodes[1], byteCodes[2],
byteCodes[3] };
String acctualValue = this.byteToHexString(codes);
Assert.assertEquals("cafebabe", acctualValue);
}
private String byteToHexString(byte[] codes) {
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < codes.length; i++) {
byte b = codes[i];
int value = b & 0xFF;
String strHex = Integer.toHexString(value);
if (strHex.length() < 2) {
strHex = "0" + strHex;
}
buffer.append(strHex);
}
return buffer.toString();
}
}