I have to write tests for an application and Im trying to write a juint test for somthing that is printed on the console. The application has -->
System.err.println("Username cannot be empty");
This is what I have done so far :
ByteArrayOutputStream errContent = new ByteArrayOutputStream();
System.setErr(new PrintStream(errContent));
//left username empty and pressed login
assertEquals("Username cannot be empty", errContent.toString());
But I get ComparisonFailure
expected <Username cannot be empty[]>
but was <Username cannot be empty[
]>
//difference of next line.
Anyone know how to solve this ? Thanks.
EDIT : Tried assertEquals("Username cannot be empty\\n", errContent.toString());
Now I get :
expected <Username cannot be empty[]
>
but was <Username cannot be empty[
]
>
What you are missing in your test is, that System.err.println()
has a linefeed at the end. Change assertEquals("Username cannot be empty", errContent.toString());
to assertEquals("Username cannot be empty"+System.getProperty("line.separator"), errContent.toString());
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