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from and of: Return read-only channels.

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David Braun 2017-10-22 12:39:02 -04:00
parent 8088d7e096
commit 9c18fc7055
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3 changed files with 54 additions and 22 deletions
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40
test/index.js
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@ -45,17 +45,27 @@ describe(`Channel`, function() {
});
describe(`from`, function() {
it(`callback`, async function() {
let counter = 0;
const callback = () => (counter < 3 ? counter++ : undefined);
assert.deepEqual(await Channel.from(callback).values(), [0, 1, 2]);
describe(`types`, function() {
it(`callback`, async function() {
let counter = 0;
const callback = () => (counter < 3 ? counter++ : undefined);
assert.deepEqual(await Channel.from(callback).values(), [0, 1, 2]);
});
it(`iterable`, async function() {
assert.deepEqual(await Channel.from([0, 1, 2]).values(), [0, 1, 2]);
});
it(`Node.js's stream.Readable`, async function() {
const readable = stream.PassThrough({ objectMode: true });
readable.write(0);
readable.write(1);
readable.end(2);
assert.deepEqual(await Channel.from(readable).values(), [0, 1, 2]);
});
});
it(`iterable`, async function() {
assert.deepEqual(await Channel.from([0, 1, 2]).values(), [0, 1, 2]);
});
it(`mapfn`, async function() {
it(`with mapfn`, async function() {
assert.deepEqual(
await Channel.from([`a`, `b`, `c`], value =>
value.toUpperCase()
@ -64,12 +74,8 @@ describe(`Channel`, function() {
);
});
it(`Node.js's stream.readOnly`, async function() {
const readOnly = stream.PassThrough({ objectMode: true });
readOnly.write(0);
readOnly.write(1);
readOnly.end(2);
assert.deepEqual(await Channel.from(readOnly).values(), [0, 1, 2]);
it(`returns a readOnly channel`, function() {
assert(!(`push` in Channel.from([0, 1, 2])));
});
});
@ -81,7 +87,9 @@ describe(`Channel`, function() {
});
it(`of`, async function() {
assert.deepEqual(await Channel.of(0, 1, 2).values(), [0, 1, 2]);
const channel = Channel.of(0, 1, 2);
assert(!(`push` in channel));
assert.deepEqual(await channel.values(), [0, 1, 2]);
});
describe(`select`, function() {