import { getTestRunner } from './runtime.ts';
import Buffer from './buffer.ts';

getTestRunner().then((t) => {
	t.test('Buffer exists', () => {
		const b = new Buffer();
		t.assertInstanceOf(b, Buffer);
		t.assertEquals(b.strlen(), 0);
	});

	t.test('Buffer.appendLine', () => {
		const b = new Buffer();

		// Carriage return and line feed
		b.appendLine();
		t.assertEquals(b.strlen(), 2);

		b.clear();
		t.assertEquals(b.strlen(), 0);

		b.appendLine('foo');
		t.assertEquals(b.strlen(), 5);
	});

	t.test('Buffer.append', () => {
		const b = new Buffer();

		b.append('foobar');
		t.assertEquals(b.strlen(), 6);
		b.clear();

		b.append('foobar', 3);
		t.assertEquals(b.strlen(), 3);
	});

	t.test('Buffer.flush', async () => {
		const b = new Buffer();
		b.append('foobarbaz');
		t.assertEquals(b.strlen(), 9);

		await b.flush();

		t.assertEquals(b.strlen(), 0);
	});
});