EDT:EUnit Testing

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EUnit Test Framework Overview

What is EUnit?

EUnit stands for EGL Unit testing framework. It is a simple open source framework to write and run repeatable EGL tests.  Its features include:

  • Tooling to generate a test program and run the test cases – Provided by EDT Framework
    • Manual and automated
    • Can be run as often as needed (on demand, nightly build, etc.)
    • GUI and command line interfaces
    • Logging, reporting, analyzing
    • Can be used in a multiple-language environment (Java, JavaScript, etc)
  • Test cases
  • Test case documentation 

EUnit tests are written in EGL. You write the tests in a normal EGL project, then use the EUnit tooling to create a "test driver" for each target language you want to test in.  The test driver is runnable code (a Java program or a JavaScript RUIHandler) that will execute the tests and create a report of their results.

How to write test cases using EUnit

1. Create an EGL Project, for example: eunit.test

  • Select Basic as the template.


  • Select the generators:

    1) If you will run the testing on both Java and JavaScript platforms, leave the default settings (both Java and JavaScript generators selected).

    2) If you will run the testing on a specific platform, select Override generation settings from workspace preferences and choose a generator.


2. Create an EGL Library, for example: test, and provide a package name, such as libs.


3. Open the library with the EGL Editor, and remove the automatically generated code.

4. Type the variable declarations and functions (we treat each function as an EUnit test case) in the library. Functions that perform a test should have the @Test annotation. For example:

package libs;
import org.eclipse.edt.eunit.runtime.LogResult;
import org.eclipse.edt.eunit.runtime.Test;

// basic library
library test
	const constFlexName string = "Fred Smith";
	varFlexName string;
	variation string;
	function runAssignmentFunction01(){@Test {}}
		variation = "constant initialization";
		LogResult.assertStringEqual1("Fred Smith", constFlexName);

5. Each @Test function should perform only one test. Use functions of the library org.eclipse.edt.eunit.runtime.LogResult to record the results of the test. LogResult's functions include:

// Report a success.
function passed(str String in)

// Report a failure.
function failed(str String in)

// Calls passed() if testCondition is true, and calls failed() if it's false.
function assertTrue(message String in, testCondition boolean in)

// Write a message to the EUnit report. This is useful for adding extra
// information about failures.
function logStdOut(logmsg String in)

// Report that a variation was not run. You might use this when you know
// test will fail but you don't want it to be treated as an error. Known 
// bugs would report "skipped" while new bugs would report "failed".
function skipped(str String in)

// Compares the 'actual' string with the 'expected' string. Calls passed()
// if they're equal, and calls failed() if they're not equal.
function assertStringEqual(message String in, expected String in, actual String in)

LogResult also has functions similar to assertStringEqual that check values of other types: assertBigintEqual, assertDateEqual, assertTimeEqual, etc.


  • Put closely related tests into the same library, and use packages to organize the libraries.
  • If an exception is thrown from a @Test function, EUnit will report it as a failure.
  • If you want to disable some test cases for certain languages, you can use targetLang in the annotation. For example, below is a test case which won't be run in JavaScript.
function runAssignmentFunction01(){@Test {targetLang = [JAVA]}}
	variation = "constant initialization";
	LogResult.assertStringEqual1("Fred Smith", constFlexName);

Creating the test driver

Right click on your EUnit project and choose Generate EGL Test Driver > Java or Generate EGL Test Driver > JavaScript.


The name of the test driver project will be the name of your EUnit project, plus eunit.java or eunit.javascript.

You must re-create your test driver if you add or remove @Test functions in the EUnit project. But you don't have to re-create the test driver if you modify an existing @Test function.


  • You can create a test driver from packages or egl files instead of an entire project.

How to run tests using EUnit


Go to the EGLSource folder of the test driver project and run eunitgen.RunAllTests_pgm.egl as an EGL Java Main Application.


There are two ways to execute the test:

  • Go to the EGLSource folder of the test driver project, and run eunitgen.RunAllTests_rui.egl as an EGL Rich UI Application.
  • Go to the EGLSource folder of the test driver project, and deploy the eunit_javascript.egldd file to a target project. Start the server and then run the HTML file in the browser.

Viewing the results

Refresh your test driver project. You should see a new folder,  ResultRoot.  It will have a subfolder whose name is a timestamp of the form yyyymmdd_hhmmss. Expand the subfolder and open the file ResultSummary.trs. You'll see a summary of the results. If you have BIRT installed you'll also see the results in a pie chart.
You can also go through every individual report by clicking the leaf node of the result tree and navigating to the corresponding source file.