This document introduces FxJsJUnit, a library for testing JavaScript code with JUnit using JavaFX's WebEngine. It is written by Mike Neck, who is interested in concurrent programming. FxJsJUnit allows testing JavaScript with type-safe assertions in JUnit. It uses a JavaFX WebEngine as the JavaScript environment. Sample code is provided to demonstrate preparing tests, accessing the WebEngine, and calling JavaScript from tests. Issues like embedding web servers and concurrent test execution are mentioned as topics for future work.

1. On FxJsJUnit
an idea to test JavaScript codes with JUnit
and JavaFX

2. Who writes this document?
● Name : mike_neck (Twitter @mike_neck)
● Jobs : No Jobs now!
○ If someone provide me a chance to have an
opportunity, I will try it! So ask me!
● Technologies :
○ Groovy
○ JavaScript
○ Java
○ Erlang
● Interested in : Concurrent Programings

3. What's the Fx-Js-JUnit?
● An library for testing JavaScript with Type
safe assertion.
● Applied JavaFX's WebEngine as a
JavaScript Environment.
● Based on these ideas and environment, we
can test for JavaScript with JUnit, most
popular testing framework.

4. Usage of Fx-Js-JUnit - the sample
code. - (1) Preparation for test.
@ClassRule
public static FxJsJUnit fxJsJUnit
= FxJsJUnit.option(CoreExtension.class)
.address("http://www.oracle.com")
.identifiedBy(WebTest.class)
.get();

5. Usage of Fx-Js-JUnit - the sample
code. - (2) getting IF for WebEngine.
private JsJUnit jsJUnit;
@Before
public void getTester() {
jsJUnit = fxJsJUnit.getTester();
}

6. Usage of Fx-Js-JUnit - the sample
code. - (3) calling JavaScript code.
@Test
public void testStringTest () {
String result = jsJUnit.callAsString(
"$('#input').text;"
);
assertThat(result, is ("Input Here!"));
}

7. Off course you can assert Plain Old
JavaScript Object with POJO.
@Test
public void personInitialization () {
Person person = new Person();
person.setName("mike");
person.setAge(35);
Person mike = jsJUnit.callAs(
"new Person('mike', 35)", Person.class);
assertThat(mike, is(person));
}

8. Architecture of Fx-Js-JUnit
4.call-function
Test
JavaFx
4.call-function
JsJUnit Test
5. call
WebEngine 4.call-function
Test
1.Launch 2.Prepare 3.execute
JUnit

9. TODOs and Problems/Difficulties
● Embbed Web Servers (Static Web Server)
/Servlet Containers (Tomcat / Jetty) /Java
EE Containers (Glassfish) to test total
Enterprise Application (TODO)
● Fx-Js-JUnit cannot be applied Concurrent
Test Execution. Because JavaFX cannot be
launched simultaneously and multiple times
without restart JVM(. It requires modification
of JUnit framework). (Problem/Difficulty)
○ to avoid this problem I'm going to develop gradle-
fxjsjunit-plugin and Jenkins-fsjsjunit-plugin.

10. Thank you for your attention.
Available resources ...
● GitHub
○ https://github.com/mike-neck/FxJsJUnit
● Another documents
○ http://www.slideshare.net/mikeneck/unit-testing-
java-script-with-javafx
■ (I'm sorry this document is written in Japanese.)