empower-core

Power Assert feature enhancer for assert function/object.

DESCRIPTION

empower-core is a core module of power-assert family. empower-core enhances standard assert function or any assert-like object to work with power-assert feature added code instrumented by espower.

empower-core works with standard assert function (best fit with Mocha), and also supports assert-like objects/functions provided by various testing frameworks such as QUnit, buster.js, and nodeunit.

Pull-requests, issue reports and patches are always welcomed. See power-assert project for more documentation.

CHANGELOG

See CHANGELOG

API

var enhancedAssert = empowerCore(originalAssert, [options])

return type
function or object

empower-core function takes function or object(originalAssert) then returns PowerAssert feature added function/object based on originalAssert. If destructive option is falsy, originalAssert will be unchanged. If destructive option is truthy, originalAssert will be manipulated directly and returned enhancedAssert will be the same instance of originalAssert.

originalAssert

type	default value
function or object	N/A

originalAssert is an instance of standard assert function or any assert-like object. see SUPPORTED ASSERTION LIBRARIES and ASSERTION LIBRARIES KNOWN TO WORK section. Be careful that originalAssert will be manipulated directly if destructive option is truthy.

options

type	default value
object	(return value of empowerCore.defaultOptions())

Configuration options. If not passed, default options will be used.

options.destructive

type	default value
boolean	false

If truthy, modify originalAssert destructively.

If false, empower-core mimics originalAssert as new object/function, so originalAssert will not be changed. If true, originalAssert will be manipulated directly and returned enhancedAssert will be the same instance of originalAssert.

options.onError

type	default value
function	(function defined in empowerCore.defaultOptions())

TBD

options.onSuccess

type	default value
function	(function defined in empowerCore.defaultOptions())

TBD

options.modifyMessageBeforeAssert

type	default value
function	N/A

TBD

options.patterns

type	default value
Array of string	objects shown below

[
    'assert(value, [message])',
    'assert.ok(value, [message])',
    'assert.equal(actual, expected, [message])',
    'assert.notEqual(actual, expected, [message])',
    'assert.strictEqual(actual, expected, [message])',
    'assert.notStrictEqual(actual, expected, [message])',
    'assert.deepEqual(actual, expected, [message])',
    'assert.notDeepEqual(actual, expected, [message])',
    'assert.deepStrictEqual(actual, expected, [message])',
    'assert.notDeepStrictEqual(actual, expected, [message])'
]

Target patterns for power assert feature instrumentation.

Pattern detection is done by call-signature. Any arguments enclosed in bracket (for example, [message]) means optional parameters. Without bracket means mandatory parameters.

var options = empowerCore.defaultOptions();

Returns default options object for empowerCore function. In other words, returns

{
    destructive: false,
    onError: onError,
    onSuccess: onSuccess,
    patterns: [
        'assert(value, [message])',
        'assert.ok(value, [message])',
        'assert.equal(actual, expected, [message])',
        'assert.notEqual(actual, expected, [message])',
        'assert.strictEqual(actual, expected, [message])',
        'assert.notStrictEqual(actual, expected, [message])',
        'assert.deepEqual(actual, expected, [message])',
        'assert.notDeepEqual(actual, expected, [message])',
        'assert.deepStrictEqual(actual, expected, [message])',
        'assert.notDeepStrictEqual(actual, expected, [message])'
    ]
}

with sensible default for onError and onSuccess

function onError (errorEvent) {
    var e = errorEvent.error;
    if (errorEvent.powerAssertContext && e.name === 'AssertionError') {
        e.powerAssertContext = errorEvent.powerAssertContext;
    }
    throw e;
}

function onSuccess(successEvent) {
    return successEvent.returnValue;
}

SUPPORTED ASSERTION LIBRARIES

• Node assert API

ASSERTION LIBRARIES KNOWN TO WORK

• QUnit.assert
• nodeunit
• buster-assertions

INSTALL

via npm

Install

$ npm install --save-dev empower-core

use empower-core npm module on browser

empowerCore function is exported

<script type="text/javascript" src="./path/to/node_modules/empower-core/build/empower-core.js"></script>

via bower

Install

$ bower install --save-dev empower-core

Then load (empowerCore function is exported)

<script type="text/javascript" src="./path/to/bower_components/empower-core/build/empower-core.js"></script>

AUTHOR

• Takuto Wada

CONTRIBUTORS

• James Talmage (jamestalmage)

LICENSE

Licensed under the MIT license.