-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathPromiseSpec.js
93 lines (70 loc) · 2.33 KB
/
PromiseSpec.js
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
86
87
88
89
90
91
92
93
describe("A Promise,", function() {
var promise;
beforeEach(function() {
promise = new Promise();
});
it("if it has once been resolved, should not resolve or reject again.", function() {
var results = [];
var errors = [];
promise.then(function(val){
results.push(val);
}, function(val) {
errors.push(val);
});
var response = promise.resolve("first");
expect(response).toBe(true);
expect(results.length).toBe(1);
expect(results[0]).toBe("first");
expect(errors.length).toBe(0);
response = promise.resolve("second");
expect(response).toBe(false);
expect(results.length).toBe(1);
expect(results[0]).toBe("first");
expect(errors.length).toBe(0);
response = promise.reject("err");
expect(response).toBe(false);
expect(results.length).toBe(1);
expect(results[0]).toBe("first");
expect(errors.length).toBe(0);
});
it("if it has once been rejected, should not resolve or reject again.", function() {
var results = [];
var errors = [];
promise.then(function(val){
results.push(val);
}, function(val) {
errors.push(val);
});
var response = promise.reject("err1");
expect(response).toBe(true);
expect(results.length).toBe(0);
expect(errors.length).toBe(1);
expect(errors[0]).toBe("err1");
response = promise.resolve("second");
expect(response).toBe(false);
expect(results.length).toBe(0);
expect(errors.length).toBe(1);
expect(errors[0]).toBe("err1");
response = promise.reject("err");
expect(response).toBe(false);
expect(results.length).toBe(0);
expect(errors.length).toBe(1);
expect(errors[0]).toBe("err1");
});
it("if it is already resolved, should still trigger actions passed to .then.", function() {
promise.resolve("done");
var resolveOut = null;
var errOut = null;
promise.then(function(val) {resolveOut = val}, function(val) {errOut = val});
expect(resolveOut).toBe("done");
expect(errOut).toBe(null);
});
it("when .then is called, it returns a Promise which resolves with the return value of the passed function.", function() {
var finalResult = null;
var returnedPromise = promise.then(function(x, y){return x + y;});
returnedPromise.then(function(result) {finalResult = result;});
promise.resolve(10, 4);
expect(returnedPromise instanceof Promise).toBe(true);
expect(finalResult).toBe(14);
});
});