CS计算机代考程序代写 junit import static org.junit.Assert.assertEquals;

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

import org.junit.Test;

public class ParserTest {

private static MyTokenizer tokenizer;

private static final String SIMPLECASE = “1+2”;
private static final String MIDCASE = “12 * 5 – 3”;
private static final String COMPLEXCASE = “(10 – 2) * (10 / 2) + 1”;

private static final String[] testExample = new String[]{“2+1”, “2-1”, “2*1”, “2/1”};

@Test(timeout=1000)
public void testSimleAdd() {
MyTokenizer mathTokenizer = new MyTokenizer(testExample[0]);
Exp t1 = new Parser(mathTokenizer).parseExp();
assertEquals(3, t1.evaluate());
}

@Test(timeout=1000)
public void testSimleSub() {
MyTokenizer mathTokenizer = new MyTokenizer(testExample[1]);
Exp t1 = new Parser(mathTokenizer).parseExp();
assertEquals(1, t1.evaluate());
}

@Test(timeout=1000)
public void testSimleMul() {
MyTokenizer mathTokenizer = new MyTokenizer(testExample[2]);
Exp t1 = new Parser(mathTokenizer).parseExp();
assertEquals(2, t1.evaluate());
}

@Test(timeout=1000)
public void testSimleDiv() {
MyTokenizer mathTokenizer = new MyTokenizer(testExample[3]);
Exp t1 = new Parser(mathTokenizer).parseExp();
assertEquals(2, t1.evaluate());
}

@Test(timeout=1000)
public void testSimpleCase(){
tokenizer = new MyTokenizer(SIMPLECASE);
try{
Exp exp = new Parser(tokenizer).parseExp();
assertEquals(“incorrect display format”, “(1 + 2)”, exp.show());
assertEquals(“incorrect evaluate value”, 3, exp.evaluate());
}catch (Exception e){
fail(e.getMessage());
}
}

@Test(timeout=1000)
public void testMidCase(){
tokenizer = new MyTokenizer(MIDCASE);
try{
Exp exp = new Parser(tokenizer).parseExp();
assertEquals(“incorrect display format”, “((12 * 5) – 3)”, exp.show());
assertEquals(“incorrect evaluate value”, 57, exp.evaluate());
}catch (Exception e){
fail(e.getMessage());
}
}

@Test(timeout=1000)
public void testComplexCase(){
tokenizer = new MyTokenizer(COMPLEXCASE);
try{
Exp exp = new Parser(tokenizer).parseExp();
assertEquals(“incorrect display format”,”(((10 – 2) * (10 / 2)) + 1)”, exp.show());
assertEquals(“incorrect evaluate value”, 41, exp.evaluate());
}catch (Exception e){
fail(e.getMessage());
}
}
}