If you & # x27; re a Java developer, you probably cognize and enjoy JUnit. It & # x27; s the go-to tool of choice for unit examination (and, as we will see below, other types of testing as easily) for Java apps.

In fact, JUnit is so democratic that it & # x27; s the most commonly included external library on Java labor on GitHub, concord to a2013 analysis. No other Java quiz framework comes closely in popularity to JUnit.

But while JUnit is wide used, are all of the projects that deploy it getting the most out of it? Probably not. Here & # x27; s a look at what you should be doing to use JUnit to maximal issue.

JUnit Basics

First, though, let & # x27; s go over the basics of JUnit, just in case you haven & # x27; t use it before.

Installation

JUnit supports any program on which Java go, and it & # x27; s pretty simple to install. Simply grab the junit.jar and hamcrest-core.jar filesfrom GitHuband place them in your trial class way.

Next, add a dependency like the follow to junit: junit in the scope exam:

& lt; dependency & gt;
& lt; groupId & gt; junit & lt; /groupId & gt;
& lt; artifactId & gt; junit & lt; /artifactId & gt;
& lt; adaptation & gt; 4.12 & lt; /version & gt;
& lt; telescope & gt; test & lt; /scope & gt;
& lt; /dependency & gt;

Canonic Usage

With JUnit installed, you can begin writing tests. This operation has three main measure.

For autonomous testing across multiple user personas, check out SUSATest — it explores your app like 10 different real users.

First, create a class, which should seem something like this:

package junitfaq;

importee org.junit. *; import static org.junit.Assert. *;

import java.util. *;

public category SimpleTest {

Second, write a test method, such as:

@Test   public void testEmptyCollection () {      Collection collection = new ArrayList ();      assertTrue (collection.isEmpty ());}

… and third, run the test! You can do that from the console with:

java org.junit.runner.JUnitCore junitfaq.SimpleTest

There ’ s lots more you can do, of trend. For all the nitty-gritty details of writing JUnit trial, assure out theAPI documentation.

Getting the Most out of JUnit

Now you cognise the basics of JUnit. But if you want to run it in product, there are some pointers to keep in mind in order to maximize testing performance and flexibility. Here are the two big ones:

• Use parallel examination, which speeds up your testing hugely. Unfortunately, JUnit doesn ’ t have a parallel testing option built-in. However, there ’ s aSauce Labs articlecommit to JUnit parallel testing, which explains how to do it using the Sauce OnDemand plugin.

• Despite the tool ’ s name, JUnit ’ s functionality is not strictly limited to unit testing. You can also do integration and acceptance tests utilize JUnit, as explained.

If you use Eclipse for your Java development, you may besides want to insure outDenis Golovin & # x27; s tipsfor making JUnit tests run faster in Eclipse. Most of his ideas involve tweaks to the Eclipse environs rather than JUnit-specific changes, but anything that makes Eclipse faster is a win in my book. And of course, don ’ t forget Sauce Labs & # x27; guide to. They & # x27; re also not JUnit-specific, but they hold to JUnit testing, and they & # x27; re good to cognize whether you use JUnit or not.

Chris Tozzi has worked as a diarist and Linux systems administrator. He has particular interestingness in unfastened origin, Agile infrastructure and networking. He is Older Editor of content and a DevOps Analyst at Fixate IO.