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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
/* global it, describe */
var assert = require('assert');
var miss = require('mississippi');
var OrderedStreams = require('..');
var to = miss.to;
var from = miss.from;
var pipe = miss.pipe;
var concat = miss.concat;
function fromOnce(fn) {
var called = false;
return from.obj(function(size, next) {
if (called) {
return next(null, null);
}
called = true;
fn.apply(this, arguments);
});
}
describe('ordered-read-streams', function () {
it('ends if no streams are given', function (done) {
var streams = new OrderedStreams();
pipe([
streams,
concat()
], done);
});
it('throws an error if stream is not readable', function (done) {
var writable = to();
function withWritable() {
new OrderedStreams(writable);
}
assert.throws(withWritable, {message:'All input streams must be readable'});
done();
});
it('emits data from all streams', function(done) {
var s1 = from.obj([{value: 'stream 1'}]);
var s2 = from.obj([{value: 'stream 2'}]);
var s3 = from.obj([{value: 'stream 3'}]);
var streams = new OrderedStreams([s1, s2, s3]);
function assertFn(results) {
assert.strictEqual(results.length, 3);
assert.deepStrictEqual(results[0], {value: 'stream 1'});
assert.deepStrictEqual(results[1], {value: 'stream 2'});
assert.deepStrictEqual(results[2], {value: 'stream 3'});
}
pipe([
streams,
concat(assertFn)
], done);
});
it('emits all data event from each stream', function (done) {
var s = from.obj([
{value: 'data1'},
{value: 'data2'},
{value: 'data3'}
]);
var streams = new OrderedStreams(s);
function assertFn(results) {
assert.strictEqual(results.length, 3);
}
pipe([
streams,
concat(assertFn)
], done);
});
it('preserves streams order', function(done) {
var s1 = fromOnce(function (size, next) {
setTimeout(function () {
next(null, {value: 'stream 1'});
}, 200);
});
var s2 = fromOnce(function (size, next) {
setTimeout(function () {
next(null, {value: 'stream 2'});
}, 30);
});
var s3 = fromOnce(function (size, next) {
setTimeout(function () {
next(null, {value: 'stream 3'});
}, 100);
});
var streams = new OrderedStreams([s1, s2, s3]);
function assertFn(results) {
assert.strictEqual(results.length, 3);
assert.deepStrictEqual(results[0], {value: 'stream 1'});
assert.deepStrictEqual(results[1], {value: 'stream 2'});
assert.deepStrictEqual(results[2], {value: 'stream 3'});
}
pipe([
streams,
concat(assertFn)
], done);
});
it('emits stream errors downstream', function (done) {
var s = fromOnce(function(size, next) {
setTimeout(function () {
next(new Error('stahp!'));
}, 500);
});
var s2 = from.obj([{value: 'Im ok!'}]);
var streams = new OrderedStreams([s, s2]);
function assertFn(err) {
assert.strictEqual(err.message, 'stahp!');
done();
}
pipe([
streams,
concat()
], assertFn);
});
it('emits received data before a stream errors downstream', function (done) {
var s = fromOnce(function(size, next) {
setTimeout(function () {
next(new Error('stahp!'));
}, 500);
});
var s2 = from.obj([{value: 'Im ok!'}]);
// Invert the order to emit data first
var streams = new OrderedStreams([s2, s]);
function assertData(chunk, enc, next) {
assert.deepStrictEqual(chunk, {value: 'Im ok!'});
next();
}
function assertErr(err) {
assert.strictEqual(err.message, 'stahp!');
done();
}
pipe([
streams,
to.obj(assertData)
], assertErr);
});
});
|
