490 lines
11 KiB
JavaScript
490 lines
11 KiB
JavaScript
"use strict";
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const promisify = require("util.promisify");
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const gensync = require("../");
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const TEST_ERROR = new Error("TEST_ERROR");
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const DID_ERROR = new Error("DID_ERROR");
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const doSuccess = gensync({
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sync: () => 42,
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async: () => Promise.resolve(42),
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});
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const doError = gensync({
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sync: () => {
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throw DID_ERROR;
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},
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async: () => Promise.reject(DID_ERROR),
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});
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function throwTestError() {
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throw TEST_ERROR;
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}
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async function expectResult(
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fn,
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arg,
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{ error, value, expectSync = false, syncErrback = expectSync }
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) {
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if (!expectSync) {
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expect(() => fn.sync(arg)).toThrow(TEST_ERROR);
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} else if (error) {
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expect(() => fn.sync(arg)).toThrow(error);
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} else {
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expect(fn.sync(arg)).toBe(value);
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}
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if (error) {
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await expect(fn.async(arg)).rejects.toBe(error);
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} else {
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await expect(fn.async(arg)).resolves.toBe(value);
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}
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await new Promise((resolve, reject) => {
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let sync = true;
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fn.errback(arg, (err, val) => {
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try {
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expect(err).toBe(error);
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expect(val).toBe(value);
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expect(sync).toBe(syncErrback);
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resolve();
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} catch (e) {
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reject(e);
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}
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});
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sync = false;
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});
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}
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describe("gensync({})", () => {
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describe("option validation", () => {
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test("disallow async and errback handler together", () => {
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try {
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gensync({
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sync: throwTestError,
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async: throwTestError,
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errback: throwTestError,
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});
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throwTestError();
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} catch (err) {
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expect(err.message).toMatch(
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/Expected one of either opts.async or opts.errback, but got _both_\./
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);
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expect(err.code).toBe("GENSYNC_OPTIONS_ERROR");
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}
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});
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test("disallow missing sync handler", () => {
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try {
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gensync({
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async: throwTestError,
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});
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throwTestError();
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} catch (err) {
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expect(err.message).toMatch(/Expected opts.sync to be a function./);
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expect(err.code).toBe("GENSYNC_OPTIONS_ERROR");
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}
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});
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test("errback callback required", () => {
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const fn = gensync({
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sync: throwTestError,
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async: throwTestError,
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});
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try {
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fn.errback();
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throwTestError();
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} catch (err) {
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expect(err.message).toMatch(/function called without callback/);
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expect(err.code).toBe("GENSYNC_ERRBACK_NO_CALLBACK");
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}
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});
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});
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describe("generator function metadata", () => {
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test("automatic naming", () => {
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expect(
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gensync({
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sync: function readFileSync() {},
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async: () => {},
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}).name
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).toBe("readFile");
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expect(
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gensync({
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sync: function readFile() {},
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async: () => {},
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}).name
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).toBe("readFile");
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expect(
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gensync({
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sync: function readFileAsync() {},
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async: () => {},
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}).name
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).toBe("readFileAsync");
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expect(
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gensync({
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sync: () => {},
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async: function readFileSync() {},
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}).name
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).toBe("readFileSync");
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expect(
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gensync({
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sync: () => {},
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async: function readFile() {},
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}).name
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).toBe("readFile");
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expect(
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gensync({
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sync: () => {},
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async: function readFileAsync() {},
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}).name
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).toBe("readFile");
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expect(
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gensync({
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sync: () => {},
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errback: function readFileSync() {},
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}).name
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).toBe("readFileSync");
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expect(
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gensync({
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sync: () => {},
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errback: function readFile() {},
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}).name
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).toBe("readFile");
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expect(
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gensync({
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sync: () => {},
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errback: function readFileAsync() {},
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}).name
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).toBe("readFileAsync");
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});
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test("explicit naming", () => {
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expect(
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gensync({
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name: "readFile",
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sync: () => {},
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async: () => {},
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}).name
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).toBe("readFile");
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});
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test("default arity", () => {
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expect(
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gensync({
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sync: function(a, b, c, d, e, f, g) {
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throwTestError();
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},
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async: throwTestError,
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}).length
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).toBe(7);
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});
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test("explicit arity", () => {
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expect(
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gensync({
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arity: 3,
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sync: throwTestError,
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async: throwTestError,
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}).length
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).toBe(3);
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});
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});
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describe("'sync' handler", async () => {
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test("success", async () => {
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const fn = gensync({
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sync: (...args) => JSON.stringify(args),
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});
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await expectResult(fn, 42, { value: "[42]", expectSync: true });
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});
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test("failure", async () => {
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const fn = gensync({
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sync: (...args) => {
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throw JSON.stringify(args);
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},
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});
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await expectResult(fn, 42, { error: "[42]", expectSync: true });
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});
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});
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describe("'async' handler", async () => {
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test("success", async () => {
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const fn = gensync({
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sync: throwTestError,
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async: (...args) => Promise.resolve(JSON.stringify(args)),
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});
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await expectResult(fn, 42, { value: "[42]" });
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});
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test("failure", async () => {
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const fn = gensync({
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sync: throwTestError,
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async: (...args) => Promise.reject(JSON.stringify(args)),
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});
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await expectResult(fn, 42, { error: "[42]" });
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});
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});
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describe("'errback' sync handler", async () => {
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test("success", async () => {
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const fn = gensync({
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sync: throwTestError,
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errback: (...args) => args.pop()(null, JSON.stringify(args)),
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});
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await expectResult(fn, 42, { value: "[42]", syncErrback: true });
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});
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test("failure", async () => {
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const fn = gensync({
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sync: throwTestError,
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errback: (...args) => args.pop()(JSON.stringify(args)),
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});
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await expectResult(fn, 42, { error: "[42]", syncErrback: true });
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});
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});
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describe("'errback' async handler", async () => {
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test("success", async () => {
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const fn = gensync({
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sync: throwTestError,
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errback: (...args) =>
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process.nextTick(() => args.pop()(null, JSON.stringify(args))),
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});
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await expectResult(fn, 42, { value: "[42]" });
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});
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test("failure", async () => {
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const fn = gensync({
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sync: throwTestError,
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errback: (...args) =>
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process.nextTick(() => args.pop()(JSON.stringify(args))),
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});
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await expectResult(fn, 42, { error: "[42]" });
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});
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});
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});
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describe("gensync(function* () {})", () => {
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test("sync throw before body", async () => {
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const fn = gensync(function*(arg = throwTestError()) {});
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await expectResult(fn, undefined, {
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error: TEST_ERROR,
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syncErrback: true,
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});
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});
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test("sync throw inside body", async () => {
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const fn = gensync(function*() {
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throwTestError();
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});
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await expectResult(fn, undefined, {
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error: TEST_ERROR,
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syncErrback: true,
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});
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});
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test("async throw inside body", async () => {
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const fn = gensync(function*() {
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const val = yield* doSuccess();
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throwTestError();
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});
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await expectResult(fn, undefined, {
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error: TEST_ERROR,
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});
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});
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test("error inside body", async () => {
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const fn = gensync(function*() {
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yield* doError();
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});
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await expectResult(fn, undefined, {
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error: DID_ERROR,
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expectSync: true,
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syncErrback: false,
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});
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});
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test("successful return value", async () => {
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const fn = gensync(function*() {
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const value = yield* doSuccess();
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expect(value).toBe(42);
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return 84;
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});
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await expectResult(fn, undefined, {
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value: 84,
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expectSync: true,
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syncErrback: false,
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});
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});
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test("successful final value", async () => {
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const fn = gensync(function*() {
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return 42;
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});
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await expectResult(fn, undefined, {
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value: 42,
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expectSync: true,
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});
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});
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test("yield unexpected object", async () => {
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const fn = gensync(function*() {
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yield {};
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});
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try {
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await fn.async();
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throwTestError();
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} catch (err) {
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expect(err.message).toMatch(
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/Got unexpected yielded value in gensync generator/
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);
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expect(err.code).toBe("GENSYNC_EXPECTED_START");
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}
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});
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test("yield suspend yield", async () => {
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const fn = gensync(function*() {
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yield Symbol.for("gensync:v1:start");
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// Should be "yield*" for no error.
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yield {};
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});
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try {
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await fn.async();
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throwTestError();
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} catch (err) {
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expect(err.message).toMatch(/Expected GENSYNC_SUSPEND, got {}/);
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expect(err.code).toBe("GENSYNC_EXPECTED_SUSPEND");
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}
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});
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test("yield suspend return", async () => {
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const fn = gensync(function*() {
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yield Symbol.for("gensync:v1:start");
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// Should be "yield*" for no error.
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return {};
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});
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try {
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await fn.async();
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throwTestError();
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} catch (err) {
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expect(err.message).toMatch(/Unexpected generator completion/);
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expect(err.code).toBe("GENSYNC_EXPECTED_SUSPEND");
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}
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});
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});
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describe("gensync.all()", () => {
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test("success", async () => {
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const fn = gensync(function*() {
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const result = yield* gensync.all([doSuccess(), doSuccess()]);
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expect(result).toEqual([42, 42]);
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});
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await expectResult(fn, undefined, {
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value: undefined,
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expectSync: true,
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syncErrback: false,
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});
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});
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test("error first", async () => {
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const fn = gensync(function*() {
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yield* gensync.all([doError(), doSuccess()]);
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});
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await expectResult(fn, undefined, {
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error: DID_ERROR,
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expectSync: true,
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syncErrback: false,
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});
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});
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test("error last", async () => {
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const fn = gensync(function*() {
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yield* gensync.all([doSuccess(), doError()]);
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});
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await expectResult(fn, undefined, {
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error: DID_ERROR,
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expectSync: true,
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syncErrback: false,
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});
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});
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test("empty list", async () => {
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const fn = gensync(function*() {
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yield* gensync.all([]);
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});
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await expectResult(fn, undefined, {
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value: undefined,
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expectSync: true,
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syncErrback: false,
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});
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});
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});
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describe("gensync.race()", () => {
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test("success", async () => {
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const fn = gensync(function*() {
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const result = yield* gensync.race([doSuccess(), doError()]);
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expect(result).toEqual(42);
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});
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await expectResult(fn, undefined, {
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value: undefined,
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expectSync: true,
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syncErrback: false,
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});
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});
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test("error", async () => {
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const fn = gensync(function*() {
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yield* gensync.race([doError(), doSuccess()]);
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});
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await expectResult(fn, undefined, {
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error: DID_ERROR,
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expectSync: true,
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syncErrback: false,
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});
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});
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});
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