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test.js
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test.js
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import test from 'ava';
import concatStream from 'concat-stream';
import fn from '.';
test.cb('removes 3rd line', t => {
const expected = 'abc\ndef\njkl\n';
const rmlines = fn(3);
rmlines.pipe(concatStream({encoding: 'string'}, data => {
t.is(data, expected);
t.end();
}));
let txt = [
'abc', 'def', 'ghi', 'jkl'
].join('\n');
txt += '\n';
rmlines.end(txt);
});
test.cb('removes 1st line of a 1-liner', t => {
const expected = '';
const rmlines = fn(1);
rmlines.pipe(concatStream({encoding: 'string'}, data => {
t.is(data, expected);
t.end();
}));
const txt = 'abc\n';
rmlines.end(txt);
});
test.cb('removes 2nd line from a buffer', t => {
const expected = 'abc\nghi\njkl';
const rmlines = fn(2);
rmlines.pipe(concatStream({encoding: 'string'}, data => {
t.is(data, expected);
t.end();
}));
const txt = [
'abc', 'def', 'ghi', 'jkl'
].join('\n');
rmlines.end(Buffer.from(txt));
});
test.cb('removes lines 1, 3 and 5', t => {
const expected = 'def\njkl\npqr';
const rmlines = fn([1, 3, 5]);
rmlines.pipe(concatStream({encoding: 'string'}, data => {
t.is(data, expected);
t.end();
}));
const txt = [
'abc', 'def', 'ghi', 'jkl', 'mno', 'pqr'
].join('\n');
rmlines.write(txt);
rmlines.end();
});
test.cb('preserves empty lines', t => {
const expected = 'abc\n\ndef\nghi\n\njkl\n\n\n';
const rmlines = fn([4]);
rmlines.pipe(concatStream({encoding: 'string'}, data => {
t.is(data, expected);
t.end();
}));
const txt = [
'abc', 'def', 'ghi', 'jkl'
].join('\n\n');
rmlines.write(txt + '\n\n\n');
rmlines.end();
});
test.cb('handles multiple writes', t => {
const expected = 'abc\ndef\njkl';
const rmlines = fn(3);
rmlines.pipe(concatStream({encoding: 'string'}, data => {
t.is(data, expected);
t.end();
}));
let txt = 'abc\nde';
rmlines.write(txt);
txt = 'f\ng';
rmlines.write(txt);
txt = 'hi\njkl';
rmlines.end(txt);
});
test('errors on maximum buffer limit', t => {
const rmlines = fn([3], {maxLength: 6});
const txt = [
'abc', 'def', 'ghi', 'jkl'
].join('\n');
t.throws(() => {
rmlines.write(txt);
});
});