结对编程2 单元测试

吴东益 201421123115、李志霖 201421123116
代码地址：https://git.coding.net/w201421123115/jiedui2.git

需求分析：

1.通过单元测试，测试加减乘除功能。
2.通过单元测试代码，测试计算类对于各种参数的支持：
a. 输入是有错误的，例如 “1 ++ 2”，
b. 在数值范围是 -1000 .. 1000 的时候，传进去 “10000 + 32768”,
c. 或者是 “ 248 / 0” 怎么办?
d. 怎么告诉函数的调用者 “你错了”? 把返回的字符串定义为 “-1” 来表示？
e. 那么如果真的计算结果是 “-1” 又怎么处理呢?

测试代码

public class Caculation {

public static String cacul(String s) {
	String[] counts = null;
	if (s.contains("+")) {
		counts = s.split("\+");
		// 判断是否输入正确
		if (counts.length > 2) {
			JOptionPane.showMessageDialog(null, "符号输入错误", "错误提示", JOptionPane.PLAIN_MESSAGE);
			System.exit(-1); // 输入错误程序退出
		} else
			return caculate(counts[0], counts[1], '+');
	} else if (s.contains("-")) {
		counts = s.split("-");
		// 判断是否输入正确
		if (counts.length > 2) {
			JOptionPane.showMessageDialog(null, "符号输入错误", "错误提示", JOptionPane.PLAIN_MESSAGE);
			System.exit(-1); // 输入错误程序退出
		} else
			return caculate(counts[0], counts[1], '-');
	} else if (s.contains("*")) {
		counts = s.split("\*");
		// 判断是否输入正确
		if (counts.length > 2) {
			JOptionPane.showMessageDialog(null, "符号输入错误", "错误提示", JOptionPane.PLAIN_MESSAGE);
			System.exit(-1); // 输入错误程序退出
		} else
			return caculate(counts[0], counts[1], '*');
	} else if (s.contains("÷")) {
		counts = s.split("÷");
		// 判断是否输入正确
		if (counts.length > 2) {
			JOptionPane.showMessageDialog(null, "符号输入错误", "错误提示", JOptionPane.PLAIN_MESSAGE);
			System.exit(-1); // 输入错误程序退出
		} else
			return caculate(counts[0], counts[1], '÷');
	}
	if (counts.length > 2)
		JOptionPane.showMessageDialog(null, "符号输入错误", "错误提示", JOptionPane.PLAIN_MESSAGE);
	return "-1";
}

public static String caculate(String count_1, String count_2, char operators) {
	switch (operators) {
	case '+':
		// 判断是否有分数,有则转换为Fraction对象
		// 当第一个运算数为分数时
		if (count_1.contains("/")) {
			Fractions fractions1 = toFraction(count_1);
			if (count_2.contains("/")) {
				Fractions fractions2 = toFraction(count_2);
				return Fractions.addtion(fractions1, fractions2);
			} else {
				return Fractions.addtion(fractions1, new Integer(count_2));
			}
		}
		// 当第二个运算数为分数时
		else if (count_2.contains("/")) {
			Fractions fractions2 = toFraction(count_2);
			return Fractions.addtion(new Integer(count_1), fractions2);
		}
		// 当两个整数进行运算时
		else {
			return new Integer(new Integer(count_1) + new Integer(count_2)).toString();
		}
	case '-':
		// 当第一个运算数为分数时
		if (count_1.contains("/")) {
			Fractions fractions1 = toFraction(count_1);
			if (count_2.contains("/")) {
				Fractions fractions2 = toFraction(count_2);
				return Fractions.subtraction(fractions1, fractions2);
			} else {
				return Fractions.subtraction(fractions1, new Integer(count_2));
			}
		}
		// 当第二个运算数为分数时
		else if (count_2.contains("/")) {
			Fractions fractions2 = toFraction(count_2);
			return Fractions.subtraction(new Integer(count_1), fractions2);
		}
		// 当两个整数进行运算时
		else {
			return new Integer(new Integer(count_1) - new Integer(count_2)).toString();
		}
	case '*':
		// 当第一个运算数为分数时
		if (count_1.contains("/")) {
			Fractions fractions1 = toFraction(count_1);
			if (count_2.contains("/")) {
				Fractions fractions2 = toFraction(count_2);
				return Fractions.multiplication(fractions1, fractions2);
			} else {
				return Fractions.multiplication(fractions1, new Integer(count_2));
			}
		}
		// 当第二个运算数为分数时
		else if (count_2.contains("/")) {
			Fractions fractions2 = toFraction(count_2);
			return Fractions.multiplication(new Integer(count_1), fractions2);
		}
		// 当两个整数进行运算时
		else {
			return new Integer(new Integer(count_1) * new Integer(count_2)).toString();
		}
	case '÷':
		// 当第一个运算数为分数时
		if (count_1.contains("/")) {
			Fractions fractions1 = toFraction(count_1);
			if (count_2.contains("/")) {
				Fractions fractions2 = toFraction(count_2);
				return Fractions.division(fractions1, fractions2);
			} else {
				return Fractions.division(fractions1, new Integer(count_2));
			}
		}
		// 当第二个运算数为分数时
		else if (count_2.contains("/")) {
			Fractions fractions2 = toFraction(count_2);
			return Fractions.division(new Integer(count_1), fractions2);
		}
		// 当两个整数进行运算时
		else {
			return Fractions.division(new Integer(count_1), new Integer(count_2));
		}
	}
	return "-1";
}

public static Fractions toFraction(String s) {
	Fractions fractions = new Fractions();
	String[] temps = s.split("/");
	if (temps.length > 2) {
		JOptionPane.showMessageDialog(null, "分数符号输入错误", "错误提示", JOptionPane.PLAIN_MESSAGE);
		System.exit(-1);
	} else {
		fractions.setValue(new Integer(temps[0]), new Integer(temps[1]));
	}
	return fractions;
}

}

实验截图

结对摆拍

实验小结：