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
85
|
/* Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/ */
"use strict";
// Testing that last evaluation result can be accessed with `$_`
add_task(async () => {
const tab = await addTab(`data:text/html;charset=utf-8,`);
const commands = await CommandsFactory.forTab(tab);
await commands.targetCommand.startListening();
info("$_ returns undefined if nothing has evaluated yet");
let response = await commands.scriptCommand.execute("$_");
basicResultCheck(response, "$_", { type: "undefined" });
info("$_ returns last value and performs basic arithmetic");
response = await commands.scriptCommand.execute("2+2");
basicResultCheck(response, "2+2", 4);
response = await commands.scriptCommand.execute("$_");
basicResultCheck(response, "$_", 4);
response = await commands.scriptCommand.execute("$_ + 2");
basicResultCheck(response, "$_ + 2", 6);
response = await commands.scriptCommand.execute("$_ + 4");
basicResultCheck(response, "$_ + 4", 10);
info("$_ has correct references to objects");
response = await commands.scriptCommand.execute("var foo = {bar:1}; foo;");
basicResultCheck(response, "var foo = {bar:1}; foo;", {
type: "object",
class: "Object",
actor: /[a-z]/,
});
checkObject(response.result.getGrip().preview.ownProperties, {
bar: {
value: 1,
},
});
response = await commands.scriptCommand.execute("$_");
basicResultCheck(response, "$_", {
type: "object",
class: "Object",
actor: /[a-z]/,
});
checkObject(response.result.getGrip().preview.ownProperties, {
bar: {
value: 1,
},
});
info(
"Update a property value and check that evaluating $_ returns the expected object instance"
);
await ContentTask.spawn(gBrowser.selectedBrowser, null, () => {
content.wrappedJSObject.foo.bar = "updated_value";
});
response = await commands.scriptCommand.execute("$_");
basicResultCheck(response, "$_", {
type: "object",
class: "Object",
actor: /[a-z]/,
});
checkObject(response.result.getGrip().preview.ownProperties, {
bar: {
value: "updated_value",
},
});
await commands.destroy();
});
function basicResultCheck(response, input, output) {
checkObject(response, {
input,
result: output,
});
ok(!response.exception, "no eval exception");
ok(!response.helperResult, "no helper result");
}
|
