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

3 votes140 views1 answer
Java arraylist integer min value
Java
29 votes148 views9 answers
Traduttore
Java
0 vote126 views1 answer
Android get app build name
Java
0 vote148 views1 answer
Como crear un array list en java
Java
1 vote136 views2 answers
Java import text file into arraylist
Java
0 vote174 views1 answer
Do switch statement always run default java
Java
0 vote135 views1 answer
Java code for square
Java
0 vote148 views2 answers
Spring code in java
Java
1 vote136 views1 answer
Immagini java
Java
2 votes136 views2 answers
Java popup message
Java