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'use strict';
const common = require('../common');
const assert = require('assert');
const cares = process.binding('cares_wrap');
const dns = require('dns');
// Stub `getaddrinfo` to *always* error.
cares.getaddrinfo = () => process.binding('uv').UV_ENOENT;
assert.throws(() => {
dns.lookup(1, {});
}, /^TypeError: Invalid arguments: hostname must be a string or falsey$/);
assert.throws(() => {
dns.lookup(false, 'cb');
}, /^TypeError: Invalid arguments: callback must be passed$/);
assert.throws(() => {
dns.lookup(false, 'options', 'cb');
}, /^TypeError: Invalid arguments: callback must be passed$/);
assert.throws(() => {
dns.lookup(false, {
hints: 100,
family: 0,
all: false
}, () => {});
}, /^TypeError: Invalid argument: hints must use valid flags$/);
assert.throws(() => {
dns.lookup(false, {
hints: 0,
family: 20,
all: false
}, () => {});
}, /^TypeError: Invalid argument: family must be 4 or 6$/);
assert.doesNotThrow(() => {
dns.lookup(false, {
hints: 0,
family: 0,
all: true
}, common.mustCall((error, result, addressType) => {
assert.ifError(error);
assert.deepStrictEqual(result, []);
assert.strictEqual(addressType, undefined);
}));
});
assert.doesNotThrow(() => {
dns.lookup('127.0.0.1', {
hints: 0,
family: 4,
all: true
}, common.mustCall((error, result, addressType) => {
assert.ifError(error);
assert.deepStrictEqual(result, [{
address: '127.0.0.1',
family: 4
}]);
assert.strictEqual(addressType, undefined);
}));
});
assert.doesNotThrow(() => {
dns.lookup('127.0.0.1', {
hints: 0,
family: 4,
all: false
}, common.mustCall((error, result, addressType) => {
assert.ifError(error);
assert.deepStrictEqual(result, '127.0.0.1');
assert.strictEqual(addressType, 4);
}));
});
assert.doesNotThrow(() => {
let tickValue = 0;
dns.lookup('example.com', common.mustCall((error, result, addressType) => {
assert(error);
assert.strictEqual(tickValue, 1);
assert.strictEqual(error.code, 'ENOENT');
}));
// Make sure that the error callback is called
// on next tick.
tickValue = 1;
});
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