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

0 vote350 views1 answer
Sling authentication handler example
Java
0 vote329 views1 answer
Spigot scoreboard objective
Java
0 vote321 views2 answers
Https://github.com/nuxt/nuxt.js/issues/8315#:~:text=%3Chtml%20lang%3D%22ru%22%20data%2Dn%2Dhead%3D%22%257B%2522lang%2522%3A%257B%2522ssr%2522%3A%2522ru%2522%257D%257D%22%3E
Java
0 vote422 views1 answer
How to generate randome number in desired range java
Java
0 vote338 views1 answer
Java icon to image
Java
27 votes341 views6 answers
Java for loop
Java
0 vote335 views1 answer
Javafx arabic letters
Java
1 vote342 views1 answer
String.join java 8
Java
0 vote350 views1 answer
Java regex of eauations
Java
0 vote350 views3 answers
Void in java
Java