Assert system.out.println

private final ByteArrayOutputStream outContent = new ByteArrayOutputStream();
private final ByteArrayOutputStream errContent = new ByteArrayOutputStream();
private final PrintStream originalOut = System.out;
private final PrintStream originalErr = System.err;

@Before
public void setUpStreams() {
    System.setOut(new PrintStream(outContent));
    System.setErr(new PrintStream(errContent));
}

@After
public void restoreStreams() {
    System.setOut(originalOut);
    System.setErr(originalErr);
}

sample test cases:

@Test
public void out() {
    System.out.print("hello");
    assertEquals("hello", outContent.toString());
}

@Test
public void err() {
    System.err.print("hello again");
    assertEquals("hello again", errContent.toString());
}

Source: stackoverflow.com

Similar codes

2 votes292 views1 answer
Java get jar execution directory
Java
1 vote294 views1 answer
Java reverse a word
Java
0 vote355 views2 answers
Required a bean of type 'org.springframework.mail.javamail.JavaMailSender
Java Spring
-2 votes287 views1 answer
Convert string to mayus java
Java
3 votes296 views2 answers
How to get the max value of an array java
Java
0 vote280 views1 answer
If ternaire java
Java
4 votes291 views4 answers
Java code examples
Java
0 vote315 views1 answer
Calculate Standard Deviation in java
Java
0 vote294 views2 answers
Java break string into words
Java
0 vote289 views4 answers
Potencia java
Java