Junit3.8學習筆記

Junit3.8學習筆記

3個測試Demo 

1. Junit 測試Demo1 Calculator.java
2. Junit 測試Demo2 Largest.java
3. Junit 自動化測試Demo3 TestAll.java

Junit 測試Demo1

測試代碼Calculator.java

package com.mark.junit;

public class Calculator {
	
	public int add(int a, int b) {
		return a + b;
	}
	
	public int subtract(int a, int b) {
		return a - b;
	}
	
	public int multiply(int a, int b) {
		return a * b;
	}
	
	public int divide(int a, int b) throws Exception{
		if(0 == b) {
			throw new Exception("除數不能為0");
		}
		return a / b;
	}

}
           

測試Junit代碼CalculatorTest.java

package com.mark.junit;

import junit.framework.Assert;
import junit.framework.TestCase;

/**
 * 測試類必須要繼承于TestCase父類
 * 在junit3.8中，測試方案要滿足如下原則
 * 1. public的
 * 2. void的
 * 3. 無方法參數
 * 4. 方法名稱必須以test開頭
 *
 */
public class CalculatorTest extends TestCase{
	
	private Calculator cal;
	
	
	@Override
	public void setUp() throws Exception {
		cal = new Calculator();
	}
	
	@Override
	public void tearDown() throws Exception {

	}
	
	
	public void testAdd() {
		int result = cal.add(1, 2);
		
		Assert.assertEquals(3, result);
	}
	
	public void testSubtract() {
		int result = cal.subtract(1, 2);
		Assert.assertEquals(-1, result);
	}
	
	public void testMultiply() {
		int result = cal.multiply(2, 3);
		Assert.assertEquals(6, result);
	}
	
	
	public void testDivide() {
		int result = 0;
		try {
			result = cal.divide(6, 2);
			
		} catch (Exception e) {
			e.printStackTrace();
			Assert.fail();
		}
		Assert.assertEquals(3, result);
	}
	
	public void testDivideDivideByZero() {
		
		Throwable tx = null;
		
		try {
			cal.divide(6, 0);
			Assert.fail("測試失敗");
		} catch (Exception ex) {
			tx = ex;
		}
		
		Assert.assertEquals(Exception.class, tx.getClass());
		Assert.assertEquals("除數不能為0", tx.getMessage());
	}
	
	public static void main(String[] args) {
		// junit.textui.TestRunner.run(CalculatorTest.class);
		junit.awtui.TestRunner.run(CalculatorTest.class);
	}
	
}
           

 Junit 測試Demo2

測試代碼Largest.java

package com.mark.junit;

public class Largest {
	public int getLargest(int[] array) throws Exception {
		if(array == null || array.length == 0) {
			throw new Exception("數組不能為空");
		}
		int result = array[0];
		for(int i=0; i<array.length; i++) {
			if(result < array[i]) {
				result = array[i];
			}
		}
		
		return result;
	}
}
           

測試junit代碼LargestTest.java

package com.mark.junit;

import junit.framework.Assert;
import junit.framework.TestCase;

public class LargestTest extends TestCase{
	private Largest largest;
	
	@Override
	protected void setUp() throws Exception {
		largest = new Largest();
	}
	
	public void testGetLargest() {
		int[] array = {1,9,-10,-20,23,34};
		
		int result =0;
		
		try {
			result = largest.getLargest(array);
		}catch(Exception ex) {
			Assert.fail("測試失敗");
		}
		
		Assert.assertEquals(34, result);
	}
	
	public void testGetLargest2() {
		Throwable tx = null;
		
		int[] array = {};
		
		try {
			largest.getLargest(array);
			Assert.fail();
		}catch(Exception ex) {
			tx = ex;
		}
		
		Assert.assertNotNull(tx);
		Assert.assertEquals(Exception.class, tx.getClass());
		Assert.assertEquals("數組不能為空", tx.getMessage());
		
	}
	
	
	public void testGetLargest3() {
		Throwable tx = null;
		
		int[] array = null;
		
		try {
			largest.getLargest(array);
			Assert.fail();
		} catch (Exception ex) {
			tx = ex;
		}
		
		Assert.assertNotNull(tx);
		Assert.assertEquals(Exception.class, tx.getClass());
		Assert.assertEquals("數組不能為空", tx.getMessage());
	}
	
	
}
           

Junit自動化測試Demo3

 Junit自動化測試代碼TestAll.java

package com.mark.junit;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

/**
 * testSuite 
 */
public class TestAll extends TestCase{
	public static Test suite() {
		TestSuite suite = new TestSuite();
		
		suite.addTestSuite(CalculatorTest.class);
		suite.addTestSuite(LargestTest.class);
		
		return suite;
	}
}