The Tor Browser: addon-sdk/source/test/test-require.js@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 'use strict';

     7 const traceback = require('sdk/console/traceback');

     8 const REQUIRE_LINE_NO = 30;

    10 exports.test_no_args = function(assert) {

    11   let passed = tryRequireModule(assert);

    12   assert.ok(passed, 'require() with no args should raise helpful error');

    13 };

    15 exports.test_invalid_sdk_module = function (assert) {

    16   let passed = tryRequireModule(assert, 'sdk/does-not-exist');

    17   assert.ok(passed, 'require() with an invalid sdk module should raise');

    18 };

    20 exports.test_invalid_relative_module = function (assert) {

    21   let passed = tryRequireModule(assert, './does-not-exist');

    22   assert.ok(passed, 'require() with an invalid relative module should raise');

    23 };

    26 function tryRequireModule(assert, module) {

    27   let passed = false;

    28   try {

    29     // This line number is important, referenced in REQUIRE_LINE_NO

    30     let doesNotExist = require(module);

    31   } catch(e) {

    32     checkError(assert, module, e);

    33     passed = true;

    34   }

    35   return passed;

    36 }

    38 function checkError (assert, name, e) {

    39   let msg = e.toString();

    40   if (name) {

    41     assert.ok(/is not found at/.test(msg),

    42       'Error message indicates module not found');

    43     assert.ok(msg.indexOf(name.replace(/\./g,'')) > -1,

    44       'Error message has the invalid module name in the message');

    45   }

    46   else {

    47     assert.equal(msg.indexOf('Error: you must provide a module name when calling require() from '), 0);

    48     assert.ok(msg.indexOf("test-require") !== -1, msg);

    49   }

    51   // we'd also like to assert that the right filename

    52   // and linenumber is in the stacktrace

    53   let tb = traceback.fromException(e);

    54   // Get the second to last frame, as the last frame is inside

    55   // toolkit/loader

    56   let lastFrame = tb[tb.length-2];

    57   assert.ok(lastFrame.fileName.indexOf("test-require.js") !== -1,

    58                           'Filename found in stacktrace');

    59   assert.equal(lastFrame.lineNumber, REQUIRE_LINE_NO,

    60                           'stacktrace has correct line number');

    61 }

    63 require('test').run(exports);

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