jquery/test/unit/ready.js

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QUnit.module( "ready" );
( function() {
var notYetReady, noEarlyExecution,
promisified = Promise.resolve( jQuery.ready ),
order = [],
args = {};
notYetReady = !jQuery.isReady;
QUnit.test( "jQuery.isReady", function( assert ) {
assert.expect( 2 );
assert.equal( notYetReady, true, "jQuery.isReady should not be true before DOM ready" );
assert.equal( jQuery.isReady, true, "jQuery.isReady should be true once DOM is ready" );
} );
// Create an event handler.
function makeHandler( testId ) {
// When returned function is executed, push testId onto `order` array
// to ensure execution order. Also, store event handler arg to ensure
// the correct arg is being passed into the event handler.
return function( arg ) {
order.push( testId );
args[ testId ] = arg;
};
}
function throwError( num ) {
// Not a global QUnit failure
var onerror = window.onerror;
window.onerror = function() {
window.onerror = onerror;
};
throw new Error( "Ready error " + num );
}
// Bind to the ready event in every possible way.
jQuery( makeHandler( "a" ) );
jQuery( document ).ready( makeHandler( "b" ) );
// Throw in an error to ensure other callbacks are called
jQuery( function() {
throwError( 1 );
} );
// Throw two errors in a row
jQuery( function() {
throwError( 2 );
} );
jQuery.when( jQuery.ready ).done( makeHandler( "c" ) );
// Do it twice, just to be sure.
jQuery( makeHandler( "d" ) );
jQuery( document ).ready( makeHandler( "e" ) );
jQuery.when( jQuery.ready ).done( makeHandler( "f" ) );
noEarlyExecution = order.length === 0;
// This assumes that QUnit tests are run on DOM ready!
QUnit.test( "jQuery ready", function( assert ) {
assert.expect( 8 );
assert.ok( noEarlyExecution,
"Handlers bound to DOM ready should not execute before DOM ready" );
// Ensure execution order.
assert.deepEqual( order, [ "a", "b", "c", "d", "e", "f" ],
"Bound DOM ready handlers should execute in on-order" );
// Ensure handler argument is correct.
assert.equal( args.a, jQuery,
"Argument passed to fn in jQuery( fn ) should be jQuery" );
assert.equal( args.b, jQuery,
"Argument passed to fn in jQuery(document).ready( fn ) should be jQuery" );
order = [];
// Now that the ready event has fired, again bind to the ready event.
// These ready handlers should execute asynchronously.
var done = assert.async();
jQuery( makeHandler( "g" ) );
jQuery( document ).ready( makeHandler( "h" ) );
window.setTimeout( function() {
assert.equal( order.shift(), "g", "Event handler should execute immediately, but async" );
assert.equal( args.g, jQuery, "Argument passed to fn in jQuery( fn ) should be jQuery" );
assert.equal( order.shift(), "h", "Event handler should execute immediately, but async" );
assert.equal( args.h, jQuery,
"Argument passed to fn in jQuery(document).ready( fn ) should be jQuery" );
done();
} );
} );
QUnit.test( "Promise.resolve(jQuery.ready)", function( assert ) {
assert.expect( 2 );
var done = jQuery.map( new Array( 2 ), function() { return assert.async(); } );
promisified.then( function() {
assert.ok( jQuery.isReady, "Native promised resolved" );
done.pop()();
} );
Promise.resolve( jQuery.ready ).then( function() {
assert.ok( jQuery.isReady, "Native promised resolved" );
done.pop()();
} );
} );
QUnit.test( "Error in ready callback does not halt all future executions (gh-1823)", function( assert ) {
assert.expect( 1 );
var done = assert.async();
jQuery( function() {
throwError( 3 );
} );
jQuery( function() {
assert.ok( true, "Subsequent handler called" );
done();
} );
} );
} )();