Maven test class

mvn install -Dmaven.test.skip=true

# or

mvn install -DskipTests

# If -Dmaven.test.skip=true (or simply -Dmaven.test.skip) is specified, 
# the test-jars aren't built, and any module that relies on them will 
# fail its build.

# In contrast, when you use -DskipTests, Maven does not run the tests, 
# but it does compile them and build the test-jar, making it available 
# for the subsequent modules.

Source: stackoverflow.com

Maven test class

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 vote98 views2 answers
How to create a console in java gui
Java
0 vote95 views1 answer
Spring data elasticsearch aggregation max
Java
2 votes126 views2 answers
Transpose of a matrix java
Java
2 votes158 views1 answer
Primefaces calendar min date validation
Java
0 vote112 views1 answer
Java random double between 0 and 1
Java
0 vote97 views1 answer
Flow dependency android
Java
1 vote103 views1 answer
Xlint:deprecation android studio
Java
2 votes106 views1 answer
Java cartesian to polar
Java
3 votes114 views1 answer
Isprime check formula java
Java
6 votes219 views2 answers
Android array to string
Java