From ff8f42755370b4bb69c907e7b47c6c70db0f4a9f Mon Sep 17 00:00:00 2001
From: Mikhail Bashkirov <mikhail.bashkirov@ing.com>
Date: Fri, 26 Apr 2019 17:16:18 +0200
Subject: [PATCH 1/2] chore: run deep test files

---
 karma.conf.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/karma.conf.js b/karma.conf.js
index 477e5b214..a0d44e413 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -11,7 +11,7 @@ module.exports = config => {
         //
         // npm run test -- --grep test/foo/bar.test.js
         // npm run test -- --grep test/bar/*
-        config.grep ? config.grep : 'packages/*/test/*.test.js',
+        config.grep ? config.grep : 'packages/*/test/**/*.test.js',
       ],
 
       // TODO: improve coverage

From aafe3d9428266cb5dbba969e23ccd40c6753d4c9 Mon Sep 17 00:00:00 2001
From: Mikhail Bashkirov <mikhail.bashkirov@ing.com>
Date: Fri, 26 Apr 2019 17:17:12 +0200
Subject: [PATCH 2/2] chore(localize): split date related functions into their
 own files

---
 packages/localize/index.js                    |   4 +-
 packages/localize/src/date/addLeadingZero.js  |  20 ++
 packages/localize/src/date/clean.js           |  13 +
 packages/localize/src/date/formatDate.js      |  40 +++
 .../src/date/getDateFormatBasedOnLocale.js    |  33 +++
 packages/localize/src/date/getLocale.js       |  17 ++
 packages/localize/src/date/normalizeDate.js   |  22 ++
 packages/localize/src/date/pad.js             |  11 +
 packages/localize/src/date/parseDate.js       |  58 +++++
 .../src/date/sanitizedDateTimeFormat.js       |  13 +
 packages/localize/src/date/splitDate.js       |   9 +
 packages/localize/src/date/trim.js            |   9 +
 packages/localize/src/formatDate.js           | 236 ------------------
 packages/localize/stories/index.stories.js    |   4 +-
 .../test/{ => date}/formatDate.test.js        |  61 +----
 .../date/getDateFormatBasedOnLocale.test.js   |  18 ++
 packages/localize/test/date/parseDate.test.js |  36 +++
 17 files changed, 313 insertions(+), 291 deletions(-)
 create mode 100644 packages/localize/src/date/addLeadingZero.js
 create mode 100644 packages/localize/src/date/clean.js
 create mode 100644 packages/localize/src/date/formatDate.js
 create mode 100644 packages/localize/src/date/getDateFormatBasedOnLocale.js
 create mode 100644 packages/localize/src/date/getLocale.js
 create mode 100644 packages/localize/src/date/normalizeDate.js
 create mode 100644 packages/localize/src/date/pad.js
 create mode 100644 packages/localize/src/date/parseDate.js
 create mode 100644 packages/localize/src/date/sanitizedDateTimeFormat.js
 create mode 100644 packages/localize/src/date/splitDate.js
 create mode 100644 packages/localize/src/date/trim.js
 delete mode 100644 packages/localize/src/formatDate.js
 rename packages/localize/test/{ => date}/formatDate.test.js (58%)
 create mode 100644 packages/localize/test/date/getDateFormatBasedOnLocale.test.js
 create mode 100644 packages/localize/test/date/parseDate.test.js

diff --git a/packages/localize/index.js b/packages/localize/index.js
index f139078e0..efb5d6cb3 100644
--- a/packages/localize/index.js
+++ b/packages/localize/index.js
@@ -1,4 +1,6 @@
-export { formatDate, getDateFormatBasedOnLocale, parseDate } from './src/formatDate.js';
+export { formatDate } from './src/date/formatDate.js';
+export { getDateFormatBasedOnLocale } from './src/date/getDateFormatBasedOnLocale.js';
+export { parseDate } from './src/date/parseDate.js';
 export {
   formatNumber,
   formatNumberToParts,
diff --git a/packages/localize/src/date/addLeadingZero.js b/packages/localize/src/date/addLeadingZero.js
new file mode 100644
index 000000000..62e3f49fb
--- /dev/null
+++ b/packages/localize/src/date/addLeadingZero.js
@@ -0,0 +1,20 @@
+import { splitDate } from './splitDate.js';
+import { pad } from './pad.js';
+
+/**
+ * To add a leading zero to a single number
+ *
+ * @param dateString
+ * @returns {*}
+ */
+export function addLeadingZero(dateString) {
+  const dateParts = splitDate(dateString);
+  const delimiter = dateParts ? dateParts[2] : '';
+  const uniformDateString = dateString.replace(/[.\-/\s]/g, delimiter);
+  const dateArray = uniformDateString.split && uniformDateString.split(delimiter);
+  if (!dateArray || dateArray.length !== 3) {
+    // prevent fail on invalid dates
+    return '';
+  }
+  return dateArray.map(pad).join('-');
+}
diff --git a/packages/localize/src/date/clean.js b/packages/localize/src/date/clean.js
new file mode 100644
index 000000000..fe817867a
--- /dev/null
+++ b/packages/localize/src/date/clean.js
@@ -0,0 +1,13 @@
+import { trim } from './trim.js';
+
+/**
+ * To clean date from added characters from IE
+ *
+ * @param dateAsString
+ * @returns {string|XML}
+ */
+export function clean(dateAsString) {
+  // list of separators is from wikipedia https://www.wikiwand.com/en/Date_format_by_country
+  // slash, point, dash or space
+  return trim(dateAsString.replace(/[^\d-. /]/g, ''));
+}
diff --git a/packages/localize/src/date/formatDate.js b/packages/localize/src/date/formatDate.js
new file mode 100644
index 000000000..c544ab8ec
--- /dev/null
+++ b/packages/localize/src/date/formatDate.js
@@ -0,0 +1,40 @@
+import { getLocale } from './getLocale.js';
+import { normalizeDate } from './normalizeDate.js';
+
+/**
+ * Formats date based on locale and options
+ *
+ * @param date
+ * @param options
+ * @returns {*}
+ */
+export function formatDate(date, options) {
+  if (!(date instanceof Date)) {
+    return '0000-00-00';
+  }
+  const formatOptions = options || {};
+  // make sure months and days are always 2-digits
+  if (!options) {
+    formatOptions.year = 'numeric';
+    formatOptions.month = '2-digit';
+    formatOptions.day = '2-digit';
+  }
+  if (options && !(options && options.year)) {
+    formatOptions.year = 'numeric';
+  }
+  if (options && !(options && options.month)) {
+    formatOptions.month = '2-digit';
+  }
+  if (options && !(options && options.day)) {
+    formatOptions.day = '2-digit';
+  }
+
+  const computedLocale = getLocale(formatOptions && formatOptions.locale);
+  let formattedDate = '';
+  try {
+    formattedDate = new Intl.DateTimeFormat(computedLocale, formatOptions).format(date);
+  } catch (e) {
+    formattedDate = '';
+  }
+  return normalizeDate(formattedDate);
+}
diff --git a/packages/localize/src/date/getDateFormatBasedOnLocale.js b/packages/localize/src/date/getDateFormatBasedOnLocale.js
new file mode 100644
index 000000000..a4e44cdd1
--- /dev/null
+++ b/packages/localize/src/date/getDateFormatBasedOnLocale.js
@@ -0,0 +1,33 @@
+import { sanitizedDateTimeFormat } from './sanitizedDateTimeFormat.js';
+import { splitDate } from './splitDate.js';
+
+/**
+ * To compute the localized date format
+ *
+ * @returns {string}
+ */
+export function getDateFormatBasedOnLocale() {
+  function computePositions(dateParts) {
+    function getPartByIndex(index) {
+      return { 2012: 'year', 12: 'month', 20: 'day' }[dateParts[index]];
+    }
+
+    return [1, 3, 5].map(getPartByIndex);
+  }
+
+  // Arbitrary date with different values for year,month,day
+  const date = new Date();
+  date.setDate(20);
+  date.setMonth(11);
+  date.setFullYear(2012);
+
+  // Strange characters added by IE11 need to be taken into account here
+  const formattedDate = sanitizedDateTimeFormat(date);
+
+  // For Dutch locale, dateParts would match: [ 1:'20', 2:'-', 3:'12', 4:'-', 5:'2012' ]
+  const dateParts = splitDate(formattedDate);
+
+  const dateFormat = {};
+  dateFormat.positions = computePositions(dateParts);
+  return `${dateFormat.positions[0]}-${dateFormat.positions[1]}-${dateFormat.positions[2]}`;
+}
diff --git a/packages/localize/src/date/getLocale.js b/packages/localize/src/date/getLocale.js
new file mode 100644
index 000000000..a8e96b988
--- /dev/null
+++ b/packages/localize/src/date/getLocale.js
@@ -0,0 +1,17 @@
+import { localize } from '../localize.js';
+
+/**
+ * Gets the locale to use
+ *
+ * @param {string} locale Locale to override browser locale
+ * @returns {string}
+ */
+export function getLocale(locale) {
+  if (locale) {
+    return locale;
+  }
+  if (localize && localize.locale) {
+    return localize.locale;
+  }
+  return 'en-GB';
+}
diff --git a/packages/localize/src/date/normalizeDate.js b/packages/localize/src/date/normalizeDate.js
new file mode 100644
index 000000000..83f6dc0a6
--- /dev/null
+++ b/packages/localize/src/date/normalizeDate.js
@@ -0,0 +1,22 @@
+/**
+ * To filter out some added characters in IE
+ *
+ * @param str
+ * @returns {string}
+ */
+export function normalizeDate(str) {
+  const dateString = [];
+  for (let i = 0, n = str.length; i < n; i += 1) {
+    // remove unicode 160
+    if (str.charCodeAt(i) === 160) {
+      dateString.push(' ');
+      // remove unicode 8206
+    } else if (str.charCodeAt(i) === 8206) {
+      dateString.push('');
+    } else {
+      dateString.push(str.charAt(i));
+    }
+  }
+
+  return dateString.join('');
+}
diff --git a/packages/localize/src/date/pad.js b/packages/localize/src/date/pad.js
new file mode 100644
index 000000000..7165f9d9c
--- /dev/null
+++ b/packages/localize/src/date/pad.js
@@ -0,0 +1,11 @@
+/**
+ * To get the absolute value of a number.
+ *
+ * @param n
+ * @returns {string}
+ */
+export function pad(n) {
+  const v = Math.abs(n);
+
+  return String(v < 10 ? `0${v}` : v);
+}
diff --git a/packages/localize/src/date/parseDate.js b/packages/localize/src/date/parseDate.js
new file mode 100644
index 000000000..2b1039698
--- /dev/null
+++ b/packages/localize/src/date/parseDate.js
@@ -0,0 +1,58 @@
+import { localize } from '../localize.js';
+import { getDateFormatBasedOnLocale } from './getDateFormatBasedOnLocale.js';
+import { addLeadingZero } from './addLeadingZero.js';
+
+const memoize = (fn, parm) => {
+  const cache = {};
+  return () => {
+    const n = parm;
+    if (n in cache) {
+      return cache[n];
+    }
+    const result = fn(n);
+    cache[n] = result;
+    return result;
+  };
+};
+
+const memoizedGetDateFormatBasedOnLocale = memoize(getDateFormatBasedOnLocale, localize.locale);
+
+/**
+ * To parse a date into the right format
+ *
+ * @param date
+ * @returns {Date}
+ */
+export function parseDate(date) {
+  const stringToParse = addLeadingZero(date);
+  let parsedString;
+  switch (memoizedGetDateFormatBasedOnLocale()) {
+    case 'day-month-year':
+      parsedString = `${stringToParse.slice(6, 10)}/${stringToParse.slice(
+        3,
+        5,
+      )}/${stringToParse.slice(0, 2)}`;
+      break;
+    case 'month-day-year':
+      parsedString = `${stringToParse.slice(6, 10)}/${stringToParse.slice(
+        0,
+        2,
+      )}/${stringToParse.slice(3, 5)}`;
+      break;
+    case 'year-month-day':
+      parsedString = `${stringToParse.slice(0, 4)}/${stringToParse.slice(
+        5,
+        7,
+      )}/${stringToParse.slice(8, 10)}`;
+      break;
+    default:
+      parsedString = '0000/00/00';
+  }
+  const parsedDate = new Date(parsedString);
+  // Check if parsedDate is not `Invalid Date`
+  // eslint-disable-next-line no-restricted-globals
+  if (!isNaN(parsedDate)) {
+    return parsedDate;
+  }
+  return undefined;
+}
diff --git a/packages/localize/src/date/sanitizedDateTimeFormat.js b/packages/localize/src/date/sanitizedDateTimeFormat.js
new file mode 100644
index 000000000..4c734e10a
--- /dev/null
+++ b/packages/localize/src/date/sanitizedDateTimeFormat.js
@@ -0,0 +1,13 @@
+import { formatDate } from './formatDate.js';
+import { clean } from './clean.js';
+
+/**
+ * To sanitize a date from IE11 handling
+ *
+ * @param date
+ * @returns {string|XML}
+ */
+export function sanitizedDateTimeFormat(date) {
+  const fDate = formatDate(date);
+  return clean(fDate);
+}
diff --git a/packages/localize/src/date/splitDate.js b/packages/localize/src/date/splitDate.js
new file mode 100644
index 000000000..6c09d9429
--- /dev/null
+++ b/packages/localize/src/date/splitDate.js
@@ -0,0 +1,9 @@
+/**
+ * To split a date into days, months, years, etc
+ *
+ * @param date
+ * @returns {Array|{index: number, input: string}|*}
+ */
+export function splitDate(date) {
+  return date.match(/(\d{1,4})([^\d]+)(\d{1,4})([^\d]+)(\d{1,4})/);
+}
diff --git a/packages/localize/src/date/trim.js b/packages/localize/src/date/trim.js
new file mode 100644
index 000000000..b6add67b2
--- /dev/null
+++ b/packages/localize/src/date/trim.js
@@ -0,0 +1,9 @@
+/**
+ * To trim the date
+ *
+ * @param dateAsString
+ * @returns {string|XML}
+ */
+export function trim(dateAsString) {
+  return dateAsString.replace(/^[^\d]*/g, '').replace(/[^\d]*$/g, '');
+}
diff --git a/packages/localize/src/formatDate.js b/packages/localize/src/formatDate.js
deleted file mode 100644
index ddfbbbaa2..000000000
--- a/packages/localize/src/formatDate.js
+++ /dev/null
@@ -1,236 +0,0 @@
-import { localize } from './localize.js';
-
-/**
- * Gets the locale to use
- *
- * @param {string} locale Locale to override browser locale
- * @returns {string}
- */
-function getLocale(locale) {
-  if (locale) {
-    return locale;
-  }
-  if (localize && localize.locale) {
-    return localize.locale;
-  }
-  return 'en-GB';
-}
-
-/**
- * To filter out some added characters in IE
- *
- * @param str
- * @returns {string}
- */
-function normalizeDate(str) {
-  const dateString = [];
-  for (let i = 0, n = str.length; i < n; i += 1) {
-    // remove unicode 160
-    if (str.charCodeAt(i) === 160) {
-      dateString.push(' ');
-      // remove unicode 8206
-    } else if (str.charCodeAt(i) === 8206) {
-      dateString.push('');
-    } else {
-      dateString.push(str.charAt(i));
-    }
-  }
-
-  return dateString.join('');
-}
-
-/**
- * Formats date based on locale and options
- *
- * @param date
- * @param options
- * @returns {*}
- */
-export function formatDate(date, options) {
-  if (!(date instanceof Date)) {
-    return '0000-00-00';
-  }
-  const formatOptions = options || {};
-  // make sure months and days are always 2-digits
-  if (!options) {
-    formatOptions.year = 'numeric';
-    formatOptions.month = '2-digit';
-    formatOptions.day = '2-digit';
-  }
-  if (options && !(options && options.year)) {
-    formatOptions.year = 'numeric';
-  }
-  if (options && !(options && options.month)) {
-    formatOptions.month = '2-digit';
-  }
-  if (options && !(options && options.day)) {
-    formatOptions.day = '2-digit';
-  }
-
-  const computedLocale = getLocale(formatOptions && formatOptions.locale);
-  let formattedDate = '';
-  try {
-    formattedDate = new Intl.DateTimeFormat(computedLocale, formatOptions).format(date);
-  } catch (e) {
-    formattedDate = '';
-  }
-  return normalizeDate(formattedDate);
-}
-/**
- * To trim the date
- *
- * @param dateAsString
- * @returns {string|XML}
- */
-function trim(dateAsString) {
-  return dateAsString.replace(/^[^\d]*/g, '').replace(/[^\d]*$/g, '');
-}
-
-/**
- * To clean date from added characters from IE
- *
- * @param dateAsString
- * @returns {string|XML}
- */
-function clean(dateAsString) {
-  // list of separators is from wikipedia https://www.wikiwand.com/en/Date_format_by_country
-  // slash, point, dash or space
-  return trim(dateAsString.replace(/[^\d-. /]/g, ''));
-}
-
-/**
- * To get the absolute value of a number.
- *
- * @param n
- * @returns {string}
- */
-function pad(n) {
-  const v = Math.abs(n);
-
-  return String(v < 10 ? `0${v}` : v);
-}
-
-/**
- * To sanitize a date from IE11 handling
- *
- * @param date
- * @returns {string|XML}
- */
-function sanitizedDateTimeFormat(date) {
-  const fDate = formatDate(date);
-  return clean(fDate);
-}
-
-/**
- * To split a date into days, months, years, etc
- *
- * @param date
- * @returns {Array|{index: number, input: string}|*}
- */
-function splitDate(date) {
-  return date.match(/(\d{1,4})([^\d]+)(\d{1,4})([^\d]+)(\d{1,4})/);
-}
-
-/**
- * To add a leading zero to a single number
- *
- * @param dateString
- * @returns {*}
- */
-function addLeadingZero(dateString) {
-  const dateParts = splitDate(dateString);
-  const delimiter = dateParts ? dateParts[2] : '';
-  const uniformDateString = dateString.replace(/[.\-/\s]/g, delimiter);
-  const dateArray = uniformDateString.split && uniformDateString.split(delimiter);
-  if (!dateArray || dateArray.length !== 3) {
-    // prevent fail on invalid dates
-    return '';
-  }
-  return dateArray.map(pad).join('-');
-}
-
-/**
- * To compute the localized date format
- *
- * @returns {string}
- */
-export function getDateFormatBasedOnLocale() {
-  function computePositions(dateParts) {
-    function getPartByIndex(index) {
-      return { 2012: 'year', 12: 'month', 20: 'day' }[dateParts[index]];
-    }
-
-    return [1, 3, 5].map(getPartByIndex);
-  }
-
-  // Arbitrary date with different values for year,month,day
-  const date = new Date();
-  date.setDate(20);
-  date.setMonth(11);
-  date.setFullYear(2012);
-
-  // Strange characters added by IE11 need to be taken into account here
-  const formattedDate = sanitizedDateTimeFormat(date);
-
-  // For Dutch locale, dateParts would match: [ 1:'20', 2:'-', 3:'12', 4:'-', 5:'2012' ]
-  const dateParts = splitDate(formattedDate);
-
-  const dateFormat = {};
-  dateFormat.positions = computePositions(dateParts);
-  return `${dateFormat.positions[0]}-${dateFormat.positions[1]}-${dateFormat.positions[2]}`;
-}
-
-const memoize = (fn, parm) => {
-  const cache = {};
-  return () => {
-    const n = parm;
-    if (n in cache) {
-      return cache[n];
-    }
-    const result = fn(n);
-    cache[n] = result;
-    return result;
-  };
-};
-
-const memoizedGetDateFormatBasedOnLocale = memoize(getDateFormatBasedOnLocale, localize.locale);
-
-/**
- * To parse a date into the right format
- *
- * @param date
- * @returns {Date}
- */
-export function parseDate(date) {
-  const stringToParse = addLeadingZero(date);
-  let parsedString;
-  switch (memoizedGetDateFormatBasedOnLocale()) {
-    case 'day-month-year':
-      parsedString = `${stringToParse.slice(6, 10)}/${stringToParse.slice(
-        3,
-        5,
-      )}/${stringToParse.slice(0, 2)}`;
-      break;
-    case 'month-day-year':
-      parsedString = `${stringToParse.slice(6, 10)}/${stringToParse.slice(
-        0,
-        2,
-      )}/${stringToParse.slice(3, 5)}`;
-      break;
-    case 'year-month-day':
-      parsedString = `${stringToParse.slice(0, 4)}/${stringToParse.slice(
-        5,
-        7,
-      )}/${stringToParse.slice(8, 10)}`;
-      break;
-    default:
-      parsedString = '0000/00/00';
-  }
-  const parsedDate = new Date(parsedString);
-  // Check if parsedDate is not `Invalid Date`
-  // eslint-disable-next-line no-restricted-globals
-  if (!isNaN(parsedDate)) {
-    return parsedDate;
-  }
-  return undefined;
-}
diff --git a/packages/localize/stories/index.stories.js b/packages/localize/stories/index.stories.js
index d82183959..7f5deae44 100644
--- a/packages/localize/stories/index.stories.js
+++ b/packages/localize/stories/index.stories.js
@@ -10,7 +10,9 @@ import {
   getGroupSeparator,
   getDecimalSeparator,
 } from '../src/formatNumber.js';
-import { formatDate, parseDate, getDateFormatBasedOnLocale } from '../src/formatDate.js';
+import { formatDate } from '../src/date/formatDate.js';
+import { parseDate } from '../src/date/parseDate.js';
+import { getDateFormatBasedOnLocale } from '../src/date/getDateFormatBasedOnLocale.js';
 
 storiesOf('Localize System|Localize', module).add('lit component', () => {
   class LitHtmlExample extends LocalizeMixin(LionLitElement) {
diff --git a/packages/localize/test/formatDate.test.js b/packages/localize/test/date/formatDate.test.js
similarity index 58%
rename from packages/localize/test/formatDate.test.js
rename to packages/localize/test/date/formatDate.test.js
index f87662acd..4efd8a8d1 100644
--- a/packages/localize/test/formatDate.test.js
+++ b/packages/localize/test/date/formatDate.test.js
@@ -1,14 +1,15 @@
 import { expect } from '@open-wc/testing';
-import { localize } from '../src/localize.js';
-import { localizeTearDown } from '../test-helpers.js';
+import { localize } from '../../src/localize.js';
+import { localizeTearDown } from '../../test-helpers.js';
 
-import { formatDate, parseDate, getDateFormatBasedOnLocale } from '../src/formatDate.js';
-
-beforeEach(() => {
-  localizeTearDown();
-});
+import { formatDate } from '../../src/date/formatDate.js';
+import { parseDate } from '../../src/date/parseDate.js';
 
 describe('formatDate', () => {
+  beforeEach(() => {
+    localizeTearDown();
+  });
+
   it('displays the appropriate date based on locale', async () => {
     const testDate = new Date('2012/05/21');
 
@@ -112,49 +113,3 @@ describe('formatDate', () => {
     expect(formatDate(date)).to.equal('0000-00-00');
   });
 });
-
-describe('parseDate()', () => {
-  function equalsDate(value, date) {
-    return (
-      Object.prototype.toString.call(value) === '[object Date]' && // is Date Object
-      value.getDate() === date.getDate() && // day
-      value.getMonth() === date.getMonth() && // month
-      value.getFullYear() === date.getFullYear() // year
-    );
-  }
-
-  afterEach(() => {
-    // makes sure that between tests the localization is reset to default state
-    document.documentElement.lang = 'en-GB';
-  });
-  it('adds leading zeros', () => {
-    expect(equalsDate(parseDate('1-1-1979'), new Date('1979/01/01'))).to.equal(true);
-    expect(equalsDate(parseDate('1-11-1979'), new Date('1979/11/01'))).to.equal(true);
-  });
-  it('creates a date object', () => {
-    expect(parseDate('10/10/2000') instanceof Date).to.equal(true);
-  });
-  it('returns a date object', () => {
-    expect(equalsDate(parseDate('1-1-1979'), new Date('1979/01/01'))).to.equal(true);
-    expect(equalsDate(parseDate('31.12.1970'), new Date('1970/12/31'))).to.equal(true);
-  });
-  it('handles all kind of delimiters', () => {
-    expect(equalsDate(parseDate('12.12.1976'), new Date('1976/12/12'))).to.equal(true);
-    expect(equalsDate(parseDate('13.12.1976'), new Date('1976/12/13'))).to.equal(true);
-    expect(equalsDate(parseDate('14.12.1976'), new Date('1976/12/14'))).to.equal(true);
-    expect(equalsDate(parseDate('14.12-1976'), new Date('1976/12/14'))).to.equal(true);
-    expect(equalsDate(parseDate('14-12/1976'), new Date('1976/12/14'))).to.equal(true);
-  });
-  it('return undefined when no valid date provided', () => {
-    expect(parseDate('12.12.1976.,')).to.equal(undefined);
-  });
-});
-
-describe('getDateFormatBasedOnLocale()', () => {
-  it('returns the positions of day, month and year', async () => {
-    localize.locale = 'en-GB';
-    expect(getDateFormatBasedOnLocale()).to.equal('day-month-year');
-    localize.locale = 'en-US';
-    expect(getDateFormatBasedOnLocale()).to.equal('month-day-year');
-  });
-});
diff --git a/packages/localize/test/date/getDateFormatBasedOnLocale.test.js b/packages/localize/test/date/getDateFormatBasedOnLocale.test.js
new file mode 100644
index 000000000..9a227ae9b
--- /dev/null
+++ b/packages/localize/test/date/getDateFormatBasedOnLocale.test.js
@@ -0,0 +1,18 @@
+import { expect } from '@open-wc/testing';
+import { localize } from '../../src/localize.js';
+import { localizeTearDown } from '../../test-helpers.js';
+
+import { getDateFormatBasedOnLocale } from '../../src/date/getDateFormatBasedOnLocale.js';
+
+describe('getDateFormatBasedOnLocale()', () => {
+  beforeEach(() => {
+    localizeTearDown();
+  });
+
+  it('returns the positions of day, month and year', async () => {
+    localize.locale = 'en-GB';
+    expect(getDateFormatBasedOnLocale()).to.equal('day-month-year');
+    localize.locale = 'en-US';
+    expect(getDateFormatBasedOnLocale()).to.equal('month-day-year');
+  });
+});
diff --git a/packages/localize/test/date/parseDate.test.js b/packages/localize/test/date/parseDate.test.js
new file mode 100644
index 000000000..cc273c1ad
--- /dev/null
+++ b/packages/localize/test/date/parseDate.test.js
@@ -0,0 +1,36 @@
+import { expect } from '@open-wc/testing';
+
+import { parseDate } from '../../src/date/parseDate.js';
+
+function equalsDate(value, date) {
+  return (
+    Object.prototype.toString.call(value) === '[object Date]' && // is Date Object
+    value.getDate() === date.getDate() && // day
+    value.getMonth() === date.getMonth() && // month
+    value.getFullYear() === date.getFullYear() // year
+  );
+}
+
+describe('parseDate()', () => {
+  it('adds leading zeros', () => {
+    expect(equalsDate(parseDate('1-1-1979'), new Date('1979/01/01'))).to.equal(true);
+    expect(equalsDate(parseDate('1-11-1979'), new Date('1979/11/01'))).to.equal(true);
+  });
+  it('creates a date object', () => {
+    expect(parseDate('10/10/2000') instanceof Date).to.equal(true);
+  });
+  it('returns a date object', () => {
+    expect(equalsDate(parseDate('1-1-1979'), new Date('1979/01/01'))).to.equal(true);
+    expect(equalsDate(parseDate('31.12.1970'), new Date('1970/12/31'))).to.equal(true);
+  });
+  it('handles all kind of delimiters', () => {
+    expect(equalsDate(parseDate('12.12.1976'), new Date('1976/12/12'))).to.equal(true);
+    expect(equalsDate(parseDate('13.12.1976'), new Date('1976/12/13'))).to.equal(true);
+    expect(equalsDate(parseDate('14.12.1976'), new Date('1976/12/14'))).to.equal(true);
+    expect(equalsDate(parseDate('14.12-1976'), new Date('1976/12/14'))).to.equal(true);
+    expect(equalsDate(parseDate('14-12/1976'), new Date('1976/12/14'))).to.equal(true);
+  });
+  it('return undefined when no valid date provided', () => {
+    expect(parseDate('12.12.1976.,')).to.equal(undefined);
+  });
+});