node/test/parallel/test-require-exceptions.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
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// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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'use strict';
const common = require('../common');
const assert = require('assert');

// A module with an error in it should throw
assert.throws(function() {
  require(`${common.fixturesDir}/throws_error`);
}, /^Error: blah$/);

// Requiring the same module again should throw as well
assert.throws(function() {
  require(`${common.fixturesDir}/throws_error`);
}, /^Error: blah$/);

// Requiring a module that does not exist should throw an
// error with its `code` set to MODULE_NOT_FOUND
assertModuleNotFound('/DOES_NOT_EXIST');

assertExists('/module-require/not-found/trailingSlash.js');
assertExists('/module-require/not-found/node_modules/module1/package.json');
assertModuleNotFound('/module-require/not-found/trailingSlash');

function assertModuleNotFound(path) {
  assert.throws(function() {
    require(common.fixturesDir + path);
  }, function(e) {
    assert.strictEqual(e.code, 'MODULE_NOT_FOUND');
    return true;
  });
}

function assertExists(fixture) {
  assert(common.fileExists(common.fixturesDir + fixture));
}