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"use strict";
/* eslint-env jest */
// ===================================================================
var makeError = require("./");
var BaseError = makeError.BaseError;
// ===================================================================
function getCommonLastItems(arr1, arr2, butFirsts) {
var n = Math.min(arr1.length, arr2.length) - (butFirsts || 0);
return [arr1.slice(-n), arr2.slice(-n)];
}
function compareStacks(actual, expected) {
actual = actual.split(/\r?\n/);
expected = expected.split(/\r?\n/);
// We want to compare only the beginning (bottom) of the stack and
// we don't want to compare the first (from head) two items.
var tmp = getCommonLastItems(actual, expected, 2);
actual = tmp[0];
expected = tmp[1];
expect(actual).toEqual(expected);
}
function randomString() {
return Math.random().toString(36).slice(2);
}
// ===================================================================
var factories = {
"makeError(name)": makeError,
"makeError(constructor)": function (name, super_) {
function MyError(message) {
MyError.super.call(this, message);
}
Object.defineProperty(MyError, "name", { value: name });
expect(makeError(MyError, super_)).toBe(MyError);
return MyError;
},
"ES3 inheritance": function (name, super_) {
function MyError(message) {
BaseError.call(this, message);
}
Object.defineProperty(MyError, "name", {
value: name,
});
function Tmp() {
this.constructor = MyError;
}
Tmp.prototype = super_.prototype;
MyError.prototype = new Tmp();
return MyError;
},
"ES5 inheritance": function (name, super_) {
function MyError(message) {
super_.call(this, message);
}
Object.defineProperty(MyError, "name", {
value: name,
});
// Manually inherits from BaseError.
MyError.prototype = Object.create(super_.prototype, {
constructor: {
configurable: true,
value: MyError,
writable: true,
},
});
return MyError;
},
"ES6 inheritance":
typeof Reflect !== "undefined" &&
function (name, super_) {
/* eslint-disable-next-line no-eval */
return Object.defineProperty(eval("(class extends super_ {})"), "name", {
value: name,
});
},
};
var keys = Object.keys(factories);
it("makeError throws on invalid arguments", function () {
expect(function () {
makeError(42);
}).toThrow(TypeError);
expect(function () {
makeError("MyError", 42);
}).toThrow(TypeError);
});
keys.forEach(function (title) {
var factory = factories[title];
(factory ? describe : describe.skip)(title, function () {
it("creates a new error class", function () {
var name = randomString();
var MyError = factory(name, BaseError);
var message = randomString();
var e = new MyError(message);
var stack = new Error().stack;
expect(e).toBeInstanceOf(Error);
expect(e).toBeInstanceOf(BaseError);
expect(e).toBeInstanceOf(MyError);
expect(e.name).toBe(name);
expect(e.message).toBe(message);
expect(typeof e.stack).toBe("string");
compareStacks(e.stack, stack);
});
describe("derivable with", function () {
keys.forEach(function (title2) {
var factory2 = factories[title2];
// these use cases are known not to be working, mark them as skipped
if (
(title === "makeError(name)" &&
(title2 === "makeError(constructor)" ||
title2 === "ES5 inheritance")) ||
(title === "ES6 inheritance" &&
(title2 === "makeError(constructor)" ||
title2 === "ES5 inheritance"))
) {
factory2 = undefined;
}
(factory2 ? it : it.skip)(title2, function () {
var baseName = randomString();
var MyBaseError = factory(baseName, BaseError);
var derivedName = randomString();
var MyDerivedError = factory2(derivedName, MyBaseError);
var message = randomString();
var e = new MyDerivedError(message);
var stack = new Error().stack;
expect(e).toBeInstanceOf(Error);
expect(e).toBeInstanceOf(BaseError);
expect(e).toBeInstanceOf(MyBaseError);
expect(e).toBeInstanceOf(MyDerivedError);
expect(e.name).toBe(derivedName);
expect(e.message).toBe(message);
expect(typeof e.stack).toBe("string");
compareStacks(e.stack, stack);
});
});
});
});
});
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