InfixExprTest.java

package structure.week7;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

public class InfixExprTest {

    @Before
    public void setUp() throws Exception {
    }
    @After
    public void tearDown() throws Exception {
    }
    @Test
    public void testEvaluate() {
        //InfixExpr expr = new InfixExpr("300*20+12*5-20/4");
        {
            InfixExpr expr = new InfixExpr("2+3*4+5");
            try {
                Assert.assertEquals(19.0, expr.evaluate(), 0.001f);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        
        {
            InfixExpr expr = new InfixExpr("3*20+12*5-40/2");
            try {
                Assert.assertEquals(100.0, expr.evaluate(), 0.001f);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        
        {
            InfixExpr expr = new InfixExpr("3*20/2");
            try {
                Assert.assertEquals(30, expr.evaluate(), 0.001f);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        
        {
            InfixExpr expr = new InfixExpr("20/2*3");
            try {
                Assert.assertEquals(30, expr.evaluate(), 0.001f);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        
        {
            InfixExpr expr = new InfixExpr("10-30+50");
            try {
                Assert.assertEquals(30, expr.evaluate(), 0.001f);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        {
            InfixExpr expr = new InfixExpr("4*2*5+5-4*5/5*3/2*4-2+4*2+2/1");
            try {
                Assert.assertEquals(29, expr.evaluate(), 0.001f);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}