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salty-dog/test/TestSource.ts

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import { expect } from 'chai';
import mockFs from 'mock-fs';
import { spy } from 'sinon';
import { PassThrough } from 'stream';
import { readSource, writeSource } from '../src/source';
import { describeLeaks, itLeaks } from './helpers/async';
export const TEST_STRING = 'hello world';
describeLeaks('load source helper', async () => {
itLeaks('should read from stdin', async () => {
const pt = new PassThrough();
const futureSource = readSource('-', pt);
pt.emit('data', Buffer.from(TEST_STRING));
pt.end();
pt.destroy();
const source = await futureSource;
expect(source).to.equal(TEST_STRING);
});
it('should read from a file', async () => {
mockFs({
test: TEST_STRING,
});
const source = await readSource('test');
mockFs.restore();
expect(source).to.equal(TEST_STRING);
});
});
describeLeaks('write source helper', async () => {
it('should write to a file', async () => {
mockFs({
test: 'empty',
});
await writeSource('test', TEST_STRING);
const source = await readSource('test');
mockFs.restore();
expect(source).to.equal(TEST_STRING);
});
it('should write to stdout', async () => {
const pt = new PassThrough();
const writeSpy = spy(pt, 'write');
await writeSource('-', TEST_STRING, pt);
pt.end();
pt.destroy();
expect(writeSpy).to.have.been.calledWith(TEST_STRING);
});
});