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'use strict';
const common = require('../common');
const assert = require('assert');
const Stream = require('stream');
const Console = require('console').Console;
const out = new Stream();
const err = new Stream();
// ensure the Console instance doesn't write to the
// process' "stdout" or "stderr" streams
process.stdout.write = process.stderr.write = common.mustNotCall();
// make sure that the "Console" function exists
assert.strictEqual('function', typeof Console);
// make sure that the Console constructor throws
// when not given a writable stream instance
assert.throws(() => {
new Console();
}, /^TypeError: Console expects a writable stream instance$/);
// Console constructor should throw if stderr exists but is not writable
assert.throws(() => {
out.write = () => {};
err.write = undefined;
new Console(out, err);
}, /^TypeError: Console expects writable stream instances$/);
out.write = err.write = (d) => {};
const c = new Console(out, err);
out.write = err.write = common.mustCall((d) => {
assert.strictEqual(d, 'test\n');
}, 2);
c.log('test');
c.error('test');
out.write = common.mustCall((d) => {
assert.strictEqual('{ foo: 1 }\n', d);
});
c.dir({ foo: 1 });
// ensure that the console functions are bound to the console instance
let called = 0;
out.write = common.mustCall((d) => {
called++;
assert.strictEqual(d, `${called} ${called - 1} [ 1, 2, 3 ]\n`);
}, 3);
[1, 2, 3].forEach(c.log);
// Console() detects if it is called without `new` keyword
assert.doesNotThrow(() => {
Console(out, err);
});
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