forked from chaijs/chai
/
assertion.js
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assertion.js
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/*!
* chai
* http://chaijs.com
* Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
* MIT Licensed
*/
var config = require('./config');
module.exports = function (_chai, util) {
/*!
* Module dependencies.
*/
var AssertionError = _chai.AssertionError
, flag = util.flag;
/*!
* Module export.
*/
_chai.Assertion = Assertion;
/*!
* Assertion Constructor
*
* Creates object for chaining.
*
* @api private
*/
function Assertion (obj, msg, stack) {
flag(this, 'ssfi', stack || arguments.callee);
flag(this, 'object', obj);
flag(this, 'message', msg);
}
Object.defineProperty(Assertion, 'includeStack', {
get: function() {
console.warn('Assertion.includeStack is deprecated, use chai.config.includeStack instead.');
return config.includeStack;
},
set: function(value) {
console.warn('Assertion.includeStack is deprecated, use chai.config.includeStack instead.');
config.includeStack = value;
}
});
Object.defineProperty(Assertion, 'showDiff', {
get: function() {
console.warn('Assertion.showDiff is deprecated, use chai.config.showDiff instead.');
return config.showDiff;
},
set: function(value) {
console.warn('Assertion.showDiff is deprecated, use chai.config.showDiff instead.');
config.showDiff = value;
}
});
Assertion.addProperty = function (name, fn) {
util.addProperty(this.prototype, name, fn);
};
Assertion.addMethod = function (name, fn) {
util.addMethod(this.prototype, name, fn);
};
Assertion.addChainableMethod = function (name, fn, chainingBehavior) {
util.addChainableMethod(this.prototype, name, fn, chainingBehavior);
};
Assertion.overwriteProperty = function (name, fn) {
util.overwriteProperty(this.prototype, name, fn);
};
Assertion.overwriteMethod = function (name, fn) {
util.overwriteMethod(this.prototype, name, fn);
};
Assertion.overwriteChainableMethod = function (name, fn, chainingBehavior) {
util.overwriteChainableMethod(this.prototype, name, fn, chainingBehavior);
};
/*!
* ### .assert(expression, message, negateMessage, expected, actual)
*
* Executes an expression and check expectations. Throws AssertionError for reporting if test doesn't pass.
*
* @name assert
* @param {Philosophical} expression to be tested
* @param {String or Function} message or function that returns message to display if expression fails
* @param {String or Function} negatedMessage or function that returns negatedMessage to display if negated expression fails
* @param {Mixed} expected value (remember to check for negation)
* @param {Mixed} actual (optional) will default to `this.obj`
* @param {Boolean} showDiff (optional) when set to `true`, assert will display a diff in addition to the message if expression fails
* @api private
*/
Assertion.prototype.assert = function (expr, msg, negateMsg, expected, _actual, showDiff) {
var ok = util.test(this, arguments);
if (true !== showDiff) showDiff = false;
if (true !== config.showDiff) showDiff = false;
if (!ok) {
var msg = util.getMessage(this, arguments)
, actual = util.getActual(this, arguments);
throw new AssertionError(msg, {
actual: actual
, expected: expected
, showDiff: showDiff
}, (config.includeStack) ? this.assert : flag(this, 'ssfi'));
}
};
/*!
* ### ._obj
*
* Quick reference to stored `actual` value for plugin developers.
*
* @api private
*/
Object.defineProperty(Assertion.prototype, '_obj',
{ get: function () {
return flag(this, 'object');
}
, set: function (val) {
flag(this, 'object', val);
}
});
};