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mock.js
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mock.js
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"use strict";
var mockExpectation = require("./mock-expectation");
var spyCallToString = require("./call").toString;
var extend = require("./util/core/extend");
var match = require("./match");
var deepEqual = require("./util/core/deep-equal").use(match);
var wrapMethod = require("./util/core/wrap-method");
var push = Array.prototype.push;
var filter = Array.prototype.filter;
function mock(object) {
if (!object || typeof object === "string") {
return mockExpectation.create(object ? object : "Anonymous mock");
}
return mock.create(object);
}
function each(collection, callback) {
var col = collection || [];
col.forEach(callback);
}
function arrayEquals(arr1, arr2, compareLength) {
if (compareLength && (arr1.length !== arr2.length)) {
return false;
}
return arr1.every(function (element, i) {
return deepEqual(element, arr2[i]);
});
}
extend(mock, {
create: function create(object) {
if (!object) {
throw new TypeError("object is null");
}
var mockObject = extend({}, mock);
mockObject.object = object;
delete mockObject.create;
return mockObject;
},
expects: function expects(method) {
if (!method) {
throw new TypeError("method is falsy");
}
if (!this.expectations) {
this.expectations = {};
this.proxies = [];
this.failures = [];
}
if (!this.expectations[method]) {
this.expectations[method] = [];
var mockObject = this;
wrapMethod(this.object, method, function () {
return mockObject.invokeMethod(method, this, arguments);
});
push.call(this.proxies, method);
}
var expectation = mockExpectation.create(method);
extend(expectation, this.object[method]);
push.call(this.expectations[method], expectation);
return expectation;
},
restore: function restore() {
var object = this.object;
each(this.proxies, function (proxy) {
if (typeof object[proxy].restore === "function") {
object[proxy].restore();
}
});
},
verify: function verify() {
var expectations = this.expectations || {};
var messages = this.failures ? this.failures.slice() : [];
var met = [];
each(this.proxies, function (proxy) {
each(expectations[proxy], function (expectation) {
if (!expectation.met()) {
push.call(messages, expectation.toString());
} else {
push.call(met, expectation.toString());
}
});
});
this.restore();
if (messages.length > 0) {
mockExpectation.fail(messages.concat(met).join("\n"));
} else if (met.length > 0) {
mockExpectation.pass(messages.concat(met).join("\n"));
}
return true;
},
invokeMethod: function invokeMethod(method, thisValue, args) {
/* if we cannot find any matching files we will explicitly call mockExpection#fail with error messages */
/* eslint consistent-return: "off" */
var expectations = this.expectations && this.expectations[method] ? this.expectations[method] : [];
var currentArgs = args || [];
var available;
var expectationsWithMatchingArgs = filter.call(expectations, function (expectation) {
var expectedArgs = expectation.expectedArguments || [];
return arrayEquals(expectedArgs, currentArgs, expectation.expectsExactArgCount);
});
var expectationsToApply = filter.call(expectationsWithMatchingArgs, function (expectation) {
return !expectation.met() && expectation.allowsCall(thisValue, args);
});
if (expectationsToApply.length > 0) {
return expectationsToApply[0].apply(thisValue, args);
}
var messages = [];
var exhausted = 0;
expectationsWithMatchingArgs.forEach(function (expectation) {
if (expectation.allowsCall(thisValue, args)) {
available = available || expectation;
} else {
exhausted += 1;
}
});
if (available && exhausted === 0) {
return available.apply(thisValue, args);
}
expectations.forEach(function (expectation) {
push.call(messages, " " + expectation.toString());
});
messages.unshift("Unexpected call: " + spyCallToString.call({
proxy: method,
args: args
}));
var err = new Error();
if (!err.stack) {
// PhantomJS does not serialize the stack trace until the error has been thrown
try {
throw err;
} catch (e) {/* empty */}
}
this.failures.push("Unexpected call: " + spyCallToString.call({
proxy: method,
args: args,
stack: err.stack
}));
mockExpectation.fail(messages.join("\n"));
}
});
module.exports = mock;