java 我如何在java中对用户输入进行单元测试
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How can I unit test user input in java
提问by user1462617
I am trying to understand how can I test a user's input (please note I am not trying to do a mock test but a test of actual user's input)
我想了解如何测试用户的输入（请注意，我不是在尝试进行模拟测试，而是在测试实际用户的输入）
Currently as you may see in my program I have hard coded the values for my test case and it is passing all tests but how can I get a user's input and test it .
目前，正如您在我的程序中所看到的，我已经对我的测试用例的值进行了硬编码，并且它正在通过所有测试，但是我如何获取用户的输入并对其进行测试。
Is there a way where I can call System.in my constructor and pass it when I create an instance of MyClass1 in the test class?
有没有办法在我的构造函数中调用 System. 并在我在测试类中创建 MyClass1 的实例时传递它？
Please, if possible give me some example code so I can better understand.
如果可能，请给我一些示例代码，以便我更好地理解。
If I have a interface as such
如果我有这样的界面
public interface IMyClass{
public int getvalue1();
public int getvalue2();
public int getvalue3();
}
and then interface implementation as such
然后接口实现
public class MyClass1 implements MyClass{
private int _value1 = 0;
private int _value2 = 0;
private int _value3 = 0;
public MyClass1(int number1, int number2, int number3)
{
_value1 = number1;
_value2 = number2;
_value3 = number3;
}
public void setLength1(int value1)
{
_value1 = value1;
}
public void setLength2(int length2)
{
_value2 = value2;
}
public void setLength3(int length3)
{
_value3 = value3;
}
public int getValue1()
{
return _value1;
}
public int getValue2()
{
return _value2;
}
public int getValue3()
{
return _value3;
}
}
and finally a test class as such:
最后是一个测试类：
public class ClasTest extends TestCase {
public void testNumbers()
{
MyClass1 numbers= new MyClass1(1,2,3);
assertThat(numbers.getValue1(),is(not(numbers.getValue2())));
}
}
Thankyou, I appreciate any help.
谢谢，我很感激任何帮助。
回答by Mike Rylander
Use System.setIn(new InputSteam());and then write to the input stream passed in to System.in
使用System.setIn(new InputSteam());然后写入传入 System.in 的输入流
see: JUnit: How to simulate System.in testing?
Single Input
单输入
String data = "Users Input";
System.setIn(new ByteArrayInputStream(data.getBytes()));
Scanner scanner = new Scanner(System.in);
System.out.println(scanner.nextLine());
Result
结果
Users Input
Multiple Inputs
多个输入
String data = "Users Input" +
"\nA second line of user input.";
System.setIn(new ByteArrayInputStream(data.getBytes()));
Scanner scanner = new Scanner(System.in);
System.out.println("Line 1: " + scanner.nextLine());
System.out.println("Line 2: " + scanner.nextLine());
Result
结果
Line 1: Users Input
Line 2: A second line of user input.
回答by djechlin
If on unix
如果在 unix
java MyProgram < sampleinput.txt
java MyProgram < sampleinput.txt
回答by NullPointerException
user Scanner class
用户扫描器类
public void testNumbers()
{
Scanner scan = new Scanner(System.in);
System.out.println("value1");
int value1 = scan.nextInt();
System.out.println("value2");
int value2 = scan.nextInt();
System.out.println("value3");
int value3 = scan.nextInt();
MyClass1 numbers= new MyClass1(value1, value2, value3);
assertThat(numbers.getValue1(),is(not(numbers.getValue2())));
}
