Re: Testing native @JsType in GWT tests

JsInterop doesn't work in legacy DevMode; you have to run the tests in production mode: https://gwt-maven-plugin.github.io/gwt-maven-plugin/test-mojo.html#productionMode

(this is the default in GWT 2.8, but Mojo's Maven plugin for GWT forces legacy DevMode by default; may I suggest that you switch to net.ltgt.gwt.maven:gwt-maven-plugin as suggested at https://gwt-maven-plugin.github.io/gwt-maven-plugin/ ? you'll have fewer of such surprises –disclosure: I'm the author of that latter plugin, and former maintainer of Mojo's one)

On Sunday, March 11, 2018 at 8:12:39 PM UTC+1, Mincong Huang wrote:

Hi Vassilis,

Thanks for your help. After having specified the TOP_WINDOW as you suggested, the test

passed in IntelliJ IDEA. However, it is still failing via Maven plugin [1]. I don't understand any

more...

Mincong

[1]: https://travis-ci.org/mincong-h/learning-gwt/jobs/352049257#L769

On Sun, Mar 11, 2018 at 6:47 PM, Vassilis Virvilis <vasvir2@gmail.com> wrote:

I would guess that script injector injects by default inside gwt frame.

You need to specify TOP_WINDOW because jsinterop are mapped to $wnd by default.

Something like that (can't test right now)

ScriptInjector.fromString(js).setWindow(ScriptInjector.TOP_WINDOW).inject();

If you do this then you need to change your jsni test to

  var p = new $wnd.ns.Person();

 Hope that helps.

    Vassilis

On Sun, Mar 11, 2018 at 3:44 PM, Mincong Huang <mincong.h@gmail.com> wrote:

Hi,

I've a simple JavaScript:

var ns = {

  Person: function() {

    this.sayHello = function() {

      return 'Hi';

    };

  }

}

And I used it to test JsInterop annotation `@JsType` in my GWT test. I injected JS code to

GWTTestCase and tried to retrieve the definition via `@JsType`. However, it doesn't

work, it seems that GWT cannot find the method (see Travis CI [1]):

> [INFO] [ERROR] function @io.mincongh.client.interop.GwtTestJsInterop$Person::sayHello() NOT FOUND, thisObj: com.google.gwt.dev.shell.JavaObject@43182ce3, methodName: @io.mincongh.client.interop.GwtTestJsInterop$Person::sayHello()

> [INFO] Tests run: 2, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 11.342 sec <<< FAILURE!

Actually, my code is pretty simple:

public class GwtTestJsInterop extends GWTTestCase {

  @Override

  public void gwtSetUp() {

    String js = "var ns = { Person: function() { this.sayHello = function() { return 'Hi'; }; } }";

    ScriptInjector.fromString(js).inject();

  }

  @Override

  public String getModuleName() {

    return R.JUNIT_MODULE;

  }

  public void testJsni() {

    assertEquals("Hi", sayHello());

  }

  private native String sayHello() /*-{

    var p = new ns.Person();

    return p.sayHello();

  }-*/;

  public void testJsType() {

    Person p = new Person();

    String words = p.sayHello();

    assertEquals("Hi", words);

  }

  @JsType(namespace = "ns", isNative = true)

  private static class Person {

    public native String sayHello();

  }

}

Note: The 2nd test method, `testJsni()`, runs successfully, so the JS should be

injected correctly. I also have the flag `generateJsInteropExports` enabled in the

Maven GWT plugin in the POM [2]. So what am I missing?

I'm using GWT 2.8.2 and Maven GWT plugin 2.8.2. Any help will be appreciated!

Thank you,

Mincong HUANG

[1]: https://travis-ci.org/mincong-h/learning-gwt/builds/351967694#L754

[2]: https://github.com/mincong-h/learning-gwt/blob/ccb8fee02fcae78b1a5db62d5722cd29ace53286/pom.xml#L106

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