mediawiki-extensions-Popups/tests/node-qunit/changeListener.test.js
joakin e6081106f1 Use EcmaScript modules instead of common.js modules
Why: Because they are the approved standard by TC39 and Ecma for
JavaScript modules.

Changes:
  * Wrap mw-node-qunit in run.js to register babel to transpile modules
    for node v6
  * Change all sources in src/ to use ES modules
    * Change constants.js to be able to run without
      jQuery.bracketedDevicePixelRatio given ES modules are hoisted to
      the top by spec so we can't patch globals before importing it
  * Change all tests in tests/node-qunit/ to use ES modules
  * Drop usage of mock-require given ES modules are easy to stub with
    sinon

Additional changes:
  * Rename tests/node-qunit/renderer.js to renderer.test.js to follow
    the convention of all the other files
  * Make npm run test:node run only .test.js test files so that it
    doesn't run the stubs.js or run.js file.

Bug: T171951
Change-Id: I17a0b76041d5e2fd18e2d54950d9d7c0db99a941
2017-07-31 23:05:44 +00:00

55 lines
997 B
JavaScript

import registerChangeListener from '../../src/changeListener';
var stubStore = ( function () {
var state;
return {
getState: function () {
return state;
},
setState: function ( value ) {
state = value;
}
};
}() );
QUnit.module( 'ext.popups/changeListener' );
QUnit.test( 'it should only call the callback when the state has changed', function ( assert ) {
var spy = this.sandbox.spy(),
boundChangeListener;
stubStore.subscribe = function ( changeListener ) {
boundChangeListener = changeListener;
};
registerChangeListener( stubStore, spy );
assert.expect( 4 );
stubStore.setState( {} );
boundChangeListener();
boundChangeListener();
assert.strictEqual( spy.callCount, 1 );
assert.ok( spy.calledWith(
undefined, // The initial internal state of the change listener.
{}
) );
stubStore.setState( {
foo: 'bar'
} );
boundChangeListener();
assert.strictEqual( spy.callCount, 2 );
assert.ok( spy.calledWith(
{},
{
foo: 'bar'
}
) );
} );