-
Notifications
You must be signed in to change notification settings - Fork 4
/
pipe.spec.ts
93 lines (78 loc) · 2.2 KB
/
pipe.spec.ts
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
import { Result } from '@/src/result';
import { ResultAsync, ResultAsyncOpFn } from '@/src/resultAsync';
import {
ActionOfT,
AsyncActionOfT,
FunctionOfTtoK,
isPromise,
Some,
} from '@/src/utilities';
describe('ResultAsync', () => {
describe('pipe', () => {
test('executes all operator functions', async () => {
const sut = ResultAsync.success(1);
const innerResult = await sut
.pipe(
map((n) => n + 1),
map((n) => n * 2),
map((n) => `Calculation: ${n}`)
)
.toPromise();
expect(innerResult).toSucceedWith('Calculation: 4');
});
test('handles side-effect operator functions', async () => {
let callCount = 0;
const sut = ResultAsync.success(1);
const innerResult = await sut
.pipe(
tap((n) => callCount++),
tap((n) => callCount++),
tap((n) => callCount++),
tap((n) => callCount++)
)
.toPromise();
expect(innerResult).toSucceedWith(1);
expect(callCount).toBe(4);
});
});
});
function map<TValue, TError, TNewValue>(
projection:
| FunctionOfTtoK<TValue, Promise<Some<TNewValue>>>
| FunctionOfTtoK<TValue, Some<TNewValue>>
): ResultAsyncOpFn<TValue, TError, TNewValue, TError> {
return (result) => {
return ResultAsync.from(
result.toPromise().then((r) => {
if (r.isFailure) {
return Result.failure<TNewValue, TError>(r.getErrorOrThrow());
}
const promiseOrValue = projection(r.getValueOrThrow());
if (isPromise(promiseOrValue)) {
return promiseOrValue.then((v) =>
Result.success<TNewValue, TError>(v)
);
}
return Result.success<TNewValue, TError>(promiseOrValue);
})
);
};
}
function tap<TValue, TError>(
action: ActionOfT<TValue> | AsyncActionOfT<TValue>
): ResultAsyncOpFn<TValue, TError, TValue, TError> {
return (result) => {
return ResultAsync.from(
result.toPromise().then(async (m) => {
if (m.isFailure) {
return m;
}
const result = action(m.getValueOrThrow());
if (isPromise(result)) {
await result;
}
return m;
})
);
};
}