InfixExprTest.java

package com.coding.basic.stack.expr;

import org.junit.Assert;
import org.junit.Test;

public class InfixExprTest {
	@Test
	public void testEvaluate() {
		{
			InfixExpr expr = new InfixExpr("2+3*4+5");
			Assert.assertEquals(19.0, expr.evaluate(), 0.001f);
		}
		{
			InfixExpr expr = new InfixExpr("3*20+12*5-40/2");
			Assert.assertEquals(100.0, expr.evaluate(), 0.001f);
		}

		{
			InfixExpr expr = new InfixExpr("3*20/2");
			Assert.assertEquals(30, expr.evaluate(), 0.001f);
		}

		{
			InfixExpr expr = new InfixExpr("20/2*3");
			Assert.assertEquals(30, expr.evaluate(), 0.001f);
		}

		{
			InfixExpr expr = new InfixExpr("10-30+50");
			Assert.assertEquals(30, expr.evaluate(), 0.001f);
		}
		{
			InfixExpr expr = new InfixExpr("10-2*3+50");
			Assert.assertEquals(54, expr.evaluate(), 0.001f);
		}

	}
}