File: test_thenable_vs_promise_ordering.html

package info (click to toggle)
firefox 143.0.3-1
  • links: PTS, VCS
  • area: main
  • in suites: sid
  • size: 4,617,328 kB
  • sloc: cpp: 7,478,492; javascript: 6,417,157; ansic: 3,720,058; python: 1,396,372; xml: 627,523; asm: 438,677; java: 186,156; sh: 63,477; makefile: 19,171; objc: 13,059; perl: 12,983; yacc: 4,583; cs: 3,846; pascal: 3,405; lex: 1,720; ruby: 1,003; exp: 762; php: 436; lisp: 258; awk: 247; sql: 66; sed: 53; csh: 10
file content (29 lines) | stat: -rw-r--r-- 1,142 bytes parent folder | download | duplicates (28) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
 
<!DOCTYPE html>
<meta charset=utf-8>
<title>Test for promise resolution ordering with thenables and promises</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
/* global async_test, assert_true, assert_equals */

var t = async_test("A promise resolved first (with a thenable) should trigger its callbacks before a promise resolved second (with a promise).");
t.step(function() {
  var customThenCalled = false;
  var p0 = Promise.resolve();
  p0.then = function(resolved, rejected) {
    customThenCalled = true;
    Promise.prototype.then.call(this, resolved, rejected);
  };
  var p1 = new Promise(function(r) { r(p0); });
  delete p0.then;
  var p2 = new Promise(function(r) { r(p0); });
  var resolutionOrder = "";
  Promise.all([ p1.then(function() { resolutionOrder += "1"; }),
                p2.then(function() { resolutionOrder += "2"; }) ])
         .then(t.step_func_done(function() {
           assert_true(customThenCalled, "Should have called custom then");
           assert_equals(resolutionOrder, "12");
         }));
});
</script>