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
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --expose-debug-as debug --allow-natives-syntax
// Test debug events when a Promise is rejected, which is caught by a
// custom promise, which throws a new exception in its reject handler.
// We expect two Exception debug events:
// 1) when promise q is rejected.
// 2) when the custom reject closure in MyPromise throws an exception.
Debug = debug.Debug;
var expected_events = 1;
var log = [];
var p = new Promise(function(resolve, reject) {
log.push("resolve");
resolve();
});
function MyPromise(resolver) {
var reject = function() {
log.push("throw in reject");
throw new Error("reject"); // event
};
var resolve = function() { };
log.push("construct");
resolver(resolve, reject);
};
MyPromise.prototype = new Promise(function() {});
p.constructor = MyPromise;
var q = p.chain(
function() {
log.push("reject caught");
return Promise.reject(new Error("caught"));
});
function listener(event, exec_state, event_data, data) {
try {
if (event == Debug.DebugEvent.Exception) {
expected_events--;
assertTrue(expected_events >= 0);
assertEquals("reject", event_data.exception().message);
// Assert that the debug event is triggered at the throw site.
assertTrue(
exec_state.frame(0).sourceLineText().indexOf("// event") > 0);
}
} catch (e) {
// Signal a failure with exit code 1. This is necessary since the
// debugger swallows exceptions and we expect the chained function
// and this listener to be executed after the main script is finished.
print("Unexpected exception: " + e + "\n" + e.stack);
quit(1);
}
}
Debug.setBreakOnUncaughtException();
Debug.setListener(listener);
log.push("end main");
function testDone(iteration) {
function checkResult() {
try {
assertTrue(iteration < 10);
if (expected_events === 0) {
assertEquals(["resolve", "construct", "end main",
"reject caught", "throw in reject"], log);
} else {
testDone(iteration + 1);
}
} catch (e) {
%AbortJS(e + "\n" + e.stack);
}
}
%EnqueueMicrotask(checkResult);
}
testDone(0);
|
