<!DOCTYPE HTML>
<html>
<head>
<title>Promise Tests</title>
</head>
<body>
<h1>Promise Tests</h1>
<p>This test demonstrates the use of <tt>promise_test</tt>. Assumes ECMAScript 6
Promise support. Some failures are expected.</p>
<div id="log"></div>
<script src="../testharness.js"></script>
<script src="../testharnessreport.js"></script>
<script>
test(
function() {
var p = new Promise(function(resolve, reject){});
assert_true("then" in p);
assert_equals(typeof Promise.resolve, "function");
assert_equals(typeof Promise.reject, "function");
},
"Promises are supported in your browser");
promise_test(
function() {
return Promise.resolve("x")
.then(
function(value) {
assert_equals(value,
"x",
"Fulfilled promise should pass result to " +
"fulfill reaction.");
});
},
"Promise fulfillment with result");
promise_test(
function(t) {
return Promise.reject(new Error("fail"))
.then(t.unreached_func("Promise should reject"),
function(reason) {
assert_true(
reason instanceof Error,
"Rejected promise should pass reason to fulfill reaction.");
assert_equals(
reason.message,
"fail",
"Rejected promise should pass reason to reject reaction.");
});
},
"Promise rejection with result");
promise_test(
function() {
var resolutions = [];
return Promise.resolve("a")
.then(
function(value) {
resolutions.push(value);
return "b";
})
.then(
function(value) {
resolutions.push(value);
return "c";
})
.then(
function(value) {
resolutions.push(value);
assert_array_equals(resolutions, ["a", "b", "c"]);
});
},
"Chain of promise resolutions");
promise_test(
function(t) {
var resolutions = [];
return Promise.resolve("x")
.then(
function(value) {
assert_true(false, "Expected failure.");
})
.then(t.unreached_func("UNEXPECTED FAILURE: Promise should not have resolved."));
},
"Assertion failure in a fulfill reaction (should FAIL with an expected failure)");
promise_test(
function(t) {
return new Promise(
function(resolve, reject) {
reject(123);
})
.then(t.unreached_func("UNEXPECTED FAILURE: Fulfill reaction reached after rejection."),
t.unreached_func("Expected failure."));
},
"unreached_func as reactor (should FAIL with an expected failure)");
promise_test(
function() {
return true;
},
"promise_test with function that doesn't return a Promise");
promise_test(function(){},
"promise_test with function that doesn't return anything");
promise_test(
function() {
return Promise.reject("Expected rejection");
},
"promise_test with unhandled rejection (should FAIL)");
promise_test(
function() {
return Promise.resolve(10)
.then(
function(value) {
throw Error("Expected exception.");
});
},
"promise_test with unhandled exception in fulfill reaction (should FAIL)");
promise_test(
function(t) {
return Promise.reject(10)
.then(
t.unreached_func("UNEXPECTED FAILURE: Fulfill reaction reached after rejection."),
function(value) {
throw Error("Expected exception.");
});
},
"promise_test with unhandled exception in reject reaction (should FAIL)");
</script>