Maven test class

In this article let’s discuss about Maven test class. Let’s go through the following methods without any delay.

Method 1:

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.

If you are facing any issues with the above approach then try the alternative that is given below. It may look similar but have a try!

Method 2 :

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

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

public void restoreStreams() {

sample test cases:

public void out() {
    assertEquals("hello", outContent.toString());

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

Hope the above solution works.

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