mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Popups
synced 2024-12-18 10:10:48 +00:00
883c8c1aca
Change-Id: I055517998ed06fccdf50ec31251ea6aa9040abb5
62 lines
1.2 KiB
JavaScript
62 lines
1.2 KiB
JavaScript
import registerChangeListener from '../../src/changeListener';
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const stubStore = ( () => {
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let state;
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return {
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getState() {
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return state;
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},
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setState( value ) {
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state = value;
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}
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};
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} )();
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QUnit.module( 'ext.popups/changeListener' );
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QUnit.test( 'it should only call the callback when the state has changed', function ( assert ) {
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const spy = this.sandbox.spy();
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let boundChangeListener;
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stubStore.subscribe = ( changeListener ) => {
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boundChangeListener = changeListener;
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};
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registerChangeListener( stubStore, spy );
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stubStore.setState( {} );
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if ( !boundChangeListener ) {
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assert.true( false, 'The change listener was not bound.' );
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}
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boundChangeListener();
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boundChangeListener();
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assert.strictEqual( spy.callCount, 1, 'The spy was called once.' );
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assert.true(
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spy.calledWith(
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undefined, // The initial internal state of the change listener.
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{}
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),
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'The spy was called with the correct arguments.'
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);
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stubStore.setState( {
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foo: 'bar'
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} );
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boundChangeListener();
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assert.strictEqual( spy.callCount, 2, 'The spy was called twice.' );
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assert.true(
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spy.calledWith(
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{},
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{
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foo: 'bar'
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}
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),
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'The spy was called with the correct arguments.'
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);
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} );
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