PostfixExprTest.java

import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

/**
 * Created by Lxx on 2017/4/29.
 */
public class PostfixExprTest {

    @Before
    public void setUp() throws Exception {
    }

    @After
    public void tearDown() throws Exception {
    }

    @Test
    public void testEvaluate() {
        {
            PostfixExpr expr = new PostfixExpr("6 5 2 3 + 8 * + 3 + *");
            Assert.assertEquals(288, expr.evaluate(),0.0f);
        }
        {
            //9+(3-1)*3+10/2
            PostfixExpr expr = new PostfixExpr("9 3 1-3*+ 10 2/+");
            Assert.assertEquals(20, expr.evaluate(),0.0f);
        }

        {
            //10-2*3+50
            PostfixExpr expr = new PostfixExpr("10 2 3 * - 50 +");
            Assert.assertEquals(54, expr.evaluate(),0.0f);
        }
    }
}