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stub.js
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stub.js
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"use strict";
var arrayProto = require("@sinonjs/commons").prototypes.array;
var behavior = require("./behavior");
var behaviors = require("./default-behaviors");
var hasOwnProperty = require("@sinonjs/commons").prototypes.object.hasOwnProperty;
var isNonExistentOwnProperty = require("./util/core/is-non-existent-own-property");
var spy = require("./spy");
var extend = require("./util/core/extend");
var functionToString = require("./util/core/function-to-string");
var getPropertyDescriptor = require("./util/core/get-property-descriptor");
var isEsModule = require("./util/core/is-es-module");
var wrapMethod = require("./util/core/wrap-method");
var stubEntireObject = require("./stub-entire-object");
var throwOnFalsyObject = require("./throw-on-falsy-object");
var valueToString = require("@sinonjs/commons").valueToString;
var forEach = arrayProto.forEach;
var pop = arrayProto.pop;
var slice = arrayProto.slice;
var sort = arrayProto.sort;
function stub(object, property) {
if (arguments.length > 2) {
throw new TypeError("stub(obj, 'meth', fn) has been removed, see documentation");
}
if (isEsModule(object)) {
throw new TypeError("ES Modules cannot be stubbed");
}
throwOnFalsyObject.apply(null, arguments);
if (isNonExistentOwnProperty(object, property)) {
throw new TypeError("Cannot stub non-existent own property " + valueToString(property));
}
var actualDescriptor = getPropertyDescriptor(object, property);
var isObject = typeof object === "object" || typeof object === "function";
var isStubbingEntireObject = typeof property === "undefined" && isObject;
var isCreatingNewStub = !object && typeof property === "undefined";
var isStubbingNonFuncProperty =
isObject &&
typeof property !== "undefined" &&
(typeof actualDescriptor === "undefined" || typeof actualDescriptor.value !== "function") &&
typeof descriptor === "undefined";
var isStubbingExistingMethod =
typeof object === "object" &&
typeof actualDescriptor !== "undefined" &&
typeof actualDescriptor.value === "function";
var arity = isStubbingExistingMethod ? object[property].length : 0;
if (isStubbingEntireObject) {
return stubEntireObject(stub, object);
}
if (isCreatingNewStub) {
return stub.create();
}
var s = stub.create(arity);
extend.nonEnum(s, {
rootObj: object,
propName: property,
restore: function restore() {
if (actualDescriptor !== undefined) {
Object.defineProperty(object, property, actualDescriptor);
return;
}
delete object[property];
}
});
return isStubbingNonFuncProperty ? s : wrapMethod(object, property, s);
}
stub.createStubInstance = function(constructor, overrides) {
if (typeof constructor !== "function") {
throw new TypeError("The constructor should be a function.");
}
var stubbedObject = stub(Object.create(constructor.prototype));
forEach(Object.keys(overrides || {}), function(propertyName) {
if (propertyName in stubbedObject) {
var value = overrides[propertyName];
if (value && value.createStubInstance) {
stubbedObject[propertyName] = value;
} else {
stubbedObject[propertyName].returns(value);
}
} else {
throw new Error("Cannot stub " + propertyName + ". Property does not exist!");
}
});
return stubbedObject;
};
/*eslint-disable no-use-before-define*/
function getParentBehaviour(stubInstance) {
return stubInstance.parent && getCurrentBehavior(stubInstance.parent);
}
function getDefaultBehavior(stubInstance) {
return stubInstance.defaultBehavior || getParentBehaviour(stubInstance) || behavior.create(stubInstance);
}
function getCurrentBehavior(stubInstance) {
var currentBehavior = stubInstance.behaviors[stubInstance.callCount - 1];
return currentBehavior && currentBehavior.isPresent() ? currentBehavior : getDefaultBehavior(stubInstance);
}
/*eslint-enable no-use-before-define*/
var uuid = 0;
var proto = {
create: function create(stubLength) {
var functionStub = function() {
var args = slice(arguments);
var matchings = functionStub.matchingFakes(args);
var fnStub =
pop(
sort(matchings, function(a, b) {
return a.matchingArguments.length - b.matchingArguments.length;
})
) || functionStub;
return getCurrentBehavior(fnStub).invoke(this, arguments);
};
var orig = functionStub;
functionStub = spy.create(functionStub, stubLength);
extend.nonEnum(functionStub, {
id: "stub#" + uuid++,
func: orig
});
extend(functionStub, stub);
extend.nonEnum(functionStub, {
instantiateFake: stub.create,
displayName: "stub",
toString: functionToString,
defaultBehavior: null,
behaviors: []
});
return functionStub;
},
resetBehavior: function() {
var fakes = this.fakes || [];
this.defaultBehavior = null;
this.behaviors = [];
delete this.returnValue;
delete this.returnArgAt;
delete this.throwArgAt;
delete this.resolveArgAt;
delete this.fakeFn;
this.returnThis = false;
this.resolveThis = false;
forEach(fakes, function(fake) {
fake.resetBehavior();
});
},
resetHistory: spy.resetHistory,
reset: function() {
this.resetHistory();
this.resetBehavior();
},
onCall: function onCall(index) {
if (!this.behaviors[index]) {
this.behaviors[index] = behavior.create(this);
}
return this.behaviors[index];
},
onFirstCall: function onFirstCall() {
return this.onCall(0);
},
onSecondCall: function onSecondCall() {
return this.onCall(1);
},
onThirdCall: function onThirdCall() {
return this.onCall(2);
}
};
forEach(Object.keys(behavior), function(method) {
if (
hasOwnProperty(behavior, method) &&
!hasOwnProperty(proto, method) &&
method !== "create" &&
method !== "withArgs" &&
method !== "invoke"
) {
proto[method] = behavior.createBehavior(method);
}
});
forEach(Object.keys(behaviors), function(method) {
if (hasOwnProperty(behaviors, method) && !hasOwnProperty(proto, method)) {
behavior.addBehavior(stub, method, behaviors[method]);
}
});
extend(stub, proto);
module.exports = stub;