chore: migrate tests to jest

jest.config.json

@@ -0,0 +1,5 @@
+{
+    "preset": "es-jest",
+    "testRegex": ["/test/.*\\.test\\.js$", "/locale-tests/.*\\.test\\.js$"],
+    "testTimeout": 20000
+}

package.json

@@ -11,8 +11,8 @@
   "typings": "dist/npm/main.d.ts",
   "scripts": {
     "build-package": "gulp build-rollup-package build-cdn",
-    "test": "gulp test",
-    "locale-tests": "gulp test --tests=\"locale-tests/generated-locales.js\"",
+    "test": "jest -- test/",
+    "locale-tests": "jest -- locale-tests/",
     "lint": "eslint ./src",
     "semantic-release": "semantic-release pre && semantic-prerelease publish && semantic-release post"
   },
@@ -32,9 +32,11 @@
     "cldr-numbers-full": "^41.0.0",
     "cldr-units-full": "^41.0.0",
     "cz-conventional-changelog": "^1.1.5",
+    "es-jest": "^1.5.0",
     "eslint": "^8.16.0",
     "ghooks": "^1.0.3",
     "gulp": "^4.0.0",
+    "jest-cli": "^26.6.3",
     "semantic-release": "^6.3.6",
     "validate-commit-msg": "^1.1.1"
   },

test/dates.test.js

@@ -440,7 +440,7 @@ describe('date parsing', () => {
     it("returns null if no value is passed", () => {
         const result = parseDate();
 
-        expect(result).toBeNull(null);
+        expect(result).toBeNull();
     });
 
     it('parses d ISO format', function () {
@@ -461,7 +461,7 @@ describe('date parsing', () => {
     });
 
     it('short year 29 should return year 2029', function () {
-        expect(parseDate("12/23/29", "M/d/yy").getFullYear(), 2029);
+        expect(parseDate("12/23/29", "M/d/yy").getFullYear()).toBe(2029);
     });
 
     it('prases formats with leading and trailing spaces', function () {
@@ -831,7 +831,7 @@ describe('date parsing', () => {
         const dateFormat = "MM/dd/yyyy";
 
         const result = parseDate("1//2100", dateFormat);
-        expect(result, null);
+        expect(result).toBeNull();
     });
 
     it('parses MMMM yyyy date format', function () {
@@ -859,7 +859,7 @@ describe('date parsing', () => {
        const wideNames = dateFormatNames(info, { type: "dayPeriods", nameType: "wide" });
        abbreviatedNames.am = wideNames.am;
        const result = parseDate("2016. 05. 27. 오전 11:00:00", "G", "ko");
-       expect(isValidDateTime(result, 2016, 5, 27, 11, 0, 0, 0 ,0), result).toBe(true);
+       expect(isValidDateTime(result, 2016, 5, 27, 11, 0, 0, 0 ,0)).toBe(true);
     });
 
     it('should return null if only year is passed', function () {
@@ -915,7 +915,7 @@ describe('date parsing', () => {
 
     it("returns null if string is not valid ISO8601", () => {
         const utcDate = new Date(Date.UTC(2000, 9, 10, 14, 30, 0));
-        expect(parseDate("2000-10-1014:30Z", "yyyy-MM-ddTHH:mmX"), null);
+        expect(parseDate("2000-10-1014:30Z", "yyyy-MM-ddTHH:mmX")).toBeNull();
     });
 
     it("parses UTC milliseconds correctly", () => {

test/errors.test.js

@@ -11,7 +11,7 @@ describe('Intl', () => {
 
         const result = `${error.name}: ${error.message}`;
 
-        expect(intlError.formatMessage(), result);
+        expect(intlError.formatMessage()).toBe(result);
     });
 
     it('should replace single placeholder in the message', () => {
@@ -24,7 +24,7 @@ describe('Intl', () => {
 
         const result = `${error.name}: Big error! p1 p2`;
 
-        expect(intlError.formatMessage("p1", "p2"), result);
+        expect(intlError.formatMessage("p1", "p2")).toBe(result);
     });
 
     it('should return  instance with message', () => {

test/format.test.js

@@ -3,8 +3,11 @@ import { toString, format } from '../src/format';
 
 const likelySubtags = require("cldr-core/supplemental/likelySubtags.json");
 const calendar = require("cldr-dates-full/main/bg/ca-gregorian.json");
+const numbers = require("cldr-numbers-full/main/bg/numbers.json");
+const currencies = require("cldr-numbers-full/main/bg/currencies.json");
+const currencyData = require("cldr-core/supplemental/currencyData.json");
 
-load(likelySubtags, calendar);
+load(likelySubtags, calendar, currencyData, numbers, currencies);
 
 describe('toString', () => {
     function logCharCodes(value) {