Writing data to System.in

java junit io system.in
Mesut picture Mesut · Sep 28, 2010 · Viewed 19.4k times · Source

In our application, we expect user input within a Thread as follows :

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

I want to pass that part in my unit test so that I can resume the thread to execute the rest of the code. How can I write something into System.in from junit?

Answer

jjnguy picture jjnguy · Sep 28, 2010

What you want to do is use the method setIn() from System. This will let you pass data into System.in from junit.

Related questions

Java, Junit - Capture the standard input / Output for use in a unit test

I'm writing integration tests using JUnit to automate the testing of a console based application. The application is homework but this part isn't the homework. I want to automate these tests to be more productive -- I don't want to …

Read More
How do you assert that a certain exception is thrown in JUnit 4 tests?

How can I use JUnit4 idiomatically to test that some code throws an exception? While I can certainly do something like this: @Test public void testFooThrowsIndexOutOfBoundsException() { boolean thrown = false; try { foo.doStuff(); } catch (IndexOutOfBoundsException e) { thrown = true; } assertTrue(thrown); } I …

Read More
Mockito : how to verify method was called on an object created within a method?

I am new to Mockito. Given the class below, how can I use Mockito to verify that someMethod was invoked exactly once after foo was invoked? public class Foo { public void foo(){ Bar bar = new Bar(); bar.someMethod(); } } I would …

Read More