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import { test } from 'tap'
import TextLineStream from '../dist/textlinestream.es.mjs'
function concatArray() {
const chunks = []
return new TransformStream({
transform(chunk) {
chunks.push(chunk)
},
flush(controller) {
controller.enqueue(chunks)
}
});
}
test('split two lines on end', async function (t) {
const {readable, writable} = new TextLineStream()
const readStream = readable
.pipeThrough(concatArray())
const writer = writable.getWriter();
writer.write('hello\nworld');
writer.close();
for await (const list of readStream) {
t.same(list, ['hello', 'world']);
t.end();
}
})
test('split two lines on two writes', async function (t) {
const {readable, writable} = new TextLineStream()
const readStream = readable
.pipeThrough(concatArray())
const writer = writable.getWriter();
writer.write('hello');
writer.write('\nworld');
writer.close();
for await (const list of readStream) {
t.same(list, ['hello', 'world']);
t.end();
}
})
test('split four lines on three writes', async function (t) {
const {readable, writable} = new TextLineStream()
const readStream = readable
.pipeThrough(concatArray())
const writer = writable.getWriter();
writer.write('hello\nwor');
writer.write('ld\nbye\nwo');
writer.write('rld');
writer.close();
for await (const list of readStream) {
t.same(list, ['hello', 'world', 'bye', 'world']);
t.end();
}
})
test('accumulate multiple writes', async function (t) {
const {readable, writable} = new TextLineStream()
const readStream = readable
.pipeThrough(concatArray())
const writer = writable.getWriter();
writer.write('hello');
writer.write('world');
writer.close();
for await (const list of readStream) {
t.same(list, ['helloworld']);
t.end();
}
})
test('support a mapper function', async function (t) {
const {readable, writable} = new TextLineStream({
mapperFun: JSON.parse
})
const readStream = readable
.pipeThrough(concatArray())
const a = { a: '42' }
const b = { b: '24' }
const writer = writable.getWriter();
writer.write(JSON.stringify(a));
writer.write('\n');
writer.write(JSON.stringify(b));
writer.close();
for await (const list of readStream) {
t.same(list, [a,b]);
t.end();
}
})
test('split lines windows-style', async function (t) {
const {readable, writable} = new TextLineStream()
const readStream = readable
.pipeThrough(concatArray())
const writer = writable.getWriter();
writer.write('hello\r\nworld');
writer.close();
for await (const list of readStream) {
t.same(list, ['hello', 'world']);
t.end();
}
})
test('do not return empty lines (default)', async function (t) {
const {readable, writable} = new TextLineStream()
const readStream = readable
.pipeThrough(concatArray())
const writer = writable.getWriter();
writer.write('hello\n\nworld');
writer.close();
for await (const list of readStream) {
t.same(list, ['hello', 'world']);
t.end();
}
})
test('return empty lines - returnEmptyLines option', async function (t) {
const {readable, writable} = new TextLineStream({
returnEmptyLines: true
})
const readStream = readable
.pipeThrough(concatArray())
const writer = writable.getWriter();
writer.write('hello\n\nworld');
writer.close();
for await (const list of readStream) {
t.same(list, ['hello', '', 'world']);
t.end();
}
}) |