michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: 'use strict';
michael@0: 
michael@0: const traceback = require('sdk/console/traceback');
michael@0: const REQUIRE_LINE_NO = 30;
michael@0: 
michael@0: exports.test_no_args = function(assert) {
michael@0:   let passed = tryRequireModule(assert);
michael@0:   assert.ok(passed, 'require() with no args should raise helpful error');
michael@0: };
michael@0: 
michael@0: exports.test_invalid_sdk_module = function (assert) {
michael@0:   let passed = tryRequireModule(assert, 'sdk/does-not-exist');
michael@0:   assert.ok(passed, 'require() with an invalid sdk module should raise');
michael@0: };
michael@0: 
michael@0: exports.test_invalid_relative_module = function (assert) {
michael@0:   let passed = tryRequireModule(assert, './does-not-exist');
michael@0:   assert.ok(passed, 'require() with an invalid relative module should raise');
michael@0: };
michael@0: 
michael@0: 
michael@0: function tryRequireModule(assert, module) {
michael@0:   let passed = false;
michael@0:   try {
michael@0:     // This line number is important, referenced in REQUIRE_LINE_NO
michael@0:     let doesNotExist = require(module);
michael@0:   } catch(e) {
michael@0:     checkError(assert, module, e);
michael@0:     passed = true;
michael@0:   }
michael@0:   return passed;
michael@0: }
michael@0: 
michael@0: function checkError (assert, name, e) {
michael@0:   let msg = e.toString();
michael@0:   if (name) {
michael@0:     assert.ok(/is not found at/.test(msg),
michael@0:       'Error message indicates module not found');
michael@0:     assert.ok(msg.indexOf(name.replace(/\./g,'')) > -1,
michael@0:       'Error message has the invalid module name in the message');
michael@0:   }
michael@0:   else {
michael@0:     assert.equal(msg.indexOf('Error: you must provide a module name when calling require() from '), 0);
michael@0:     assert.ok(msg.indexOf("test-require") !== -1, msg);
michael@0:   }
michael@0: 
michael@0:   // we'd also like to assert that the right filename
michael@0:   // and linenumber is in the stacktrace
michael@0:   let tb = traceback.fromException(e);
michael@0:   // Get the second to last frame, as the last frame is inside
michael@0:   // toolkit/loader
michael@0:   let lastFrame = tb[tb.length-2];
michael@0:   assert.ok(lastFrame.fileName.indexOf("test-require.js") !== -1,
michael@0:                           'Filename found in stacktrace');
michael@0:   assert.equal(lastFrame.lineNumber, REQUIRE_LINE_NO,
michael@0:                           'stacktrace has correct line number');
michael@0: }
michael@0: 
michael@0: require('test').run(exports);