From 15949b1c9394e197cc162f2606f6370fd1d33a89 Mon Sep 17 00:00:00 2001
From: Sune Simonsen <sune@we-knowhow.dk>
Date: Fri, 13 Sep 2019 15:39:16 +0200
Subject: [PATCH] Added a round-trip test for formatting and parsing dates in
 all locales

---
 scripts/test/locales.test.js | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 scripts/test/locales.test.js

diff --git a/scripts/test/locales.test.js b/scripts/test/locales.test.js
new file mode 100644
index 0000000000..6be575b543
--- /dev/null
+++ b/scripts/test/locales.test.js
@@ -0,0 +1,34 @@
+/* eslint-env mocha */
+
+import path from 'path'
+import assert from 'power-assert'
+import Chance from 'chance'
+import format from '../../src/format'
+import parse from '../../src/parse'
+
+import listLocales from '../../scripts/_lib/listLocales'
+
+const chance = new Chance(42)
+
+listLocales().forEach(({ name, code }) => {
+  describe(`${name}`, () => {
+    chance.n(chance.date, 1).forEach(date => {
+      it(`parse(format(${date.toISOString()})) = ${date.toISOString()}`, () => {
+        const locale = require(path.join('..', '..', 'src', 'locale', code))
+        const formattedDate = format(
+          date,
+          locale.formatLong.date({ width: 'long' }),
+          { locale }
+        )
+
+        const parsedDate = parse(formattedDate, 'PP', date, { locale })
+        console.log(formattedDate, parsedDate)
+
+        assert.deepEqual(
+          parsedDate.toLocaleDateString(),
+          date.toLocaleDateString()
+        )
+      })
+    })
+  })
+})