【单元测试】Junit 4（九）--junit4 测试private方法

直接上代码

Calculator.java

public class Calculator {

	private String name;
	private int age;

	public Calculator(String name, int age) {
		this.name = name;
		this.age = age;
	}

	private int add(int a, int b) {
		return a + b;
	}
}

CalculatorTest.java

import org.junit.Test;

import static org.junit.Assert.*;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class CalculatorTest {

	@Test
	public void testAgeField() throws IllegalArgumentException,
			IllegalAccessException {
		String name = "lixiaoqi";
		int age = 100;
		Field[] fa = Calculator.class.getDeclaredFields();
		for (Field f : fa) {
			if (f.getName().equals("age")) {
				f.setAccessible(true);
				Calculator calculator = new Calculator(name, age);
				int result = (int) f.get(calculator);
				assertEquals(age, result);
			}
		}
	}

	@Test
	public void testAddMethod() {
		String name = "lixiaoqi";
		int age = 100;
		Calculator c = new Calculator(name, age);
		Class<Calculator> cal = Calculator.class;
		try {
			Method method = cal.getDeclaredMethod("add", new Class[] {
					int.class, int.class });
			method.setAccessible(true);
			Object obj = method.invoke(c, new Object[] { 100, 2 });
			assertEquals(102, obj);
		} catch (Exception e) {
			fail("-----");
		}
	}
}