From 2f4938986eed8c0058663256e02db0f088b758e4 Mon Sep 17 00:00:00 2001
From: Bernhard Pottler <bpottler@nexgo.de>
Date: Mon, 6 Jun 2022 08:04:52 +0200
Subject: [PATCH] test: add tests for customParseFormat.utils.js

---
 test/plugin/customParseFormat.utils.test.js | 27 +++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 test/plugin/customParseFormat.utils.test.js

diff --git a/test/plugin/customParseFormat.utils.test.js b/test/plugin/customParseFormat.utils.test.js
new file mode 100644
index 000000000..24d2e676f
--- /dev/null
+++ b/test/plugin/customParseFormat.utils.test.js
@@ -0,0 +1,27 @@
+import MockDate from 'mockdate'
+import { daysInMonth } from '../../src/plugin/customParseFormat/utils'
+
+beforeEach(() => {
+  MockDate.set(new Date())
+})
+
+afterEach(() => {
+  MockDate.reset()
+})
+
+it('Days in Month for months with constant length', () => {
+  expect(daysInMonth(2022, 5)).toBe(31)
+  expect(daysInMonth(2013, 9)).toBe(30)
+})
+
+it('Days in Month for february', () => {
+  expect(daysInMonth(2003, 2)).toBe(28)
+  expect(daysInMonth(2100, 2)).toBe(28)
+  expect(daysInMonth(2000, 2)).toBe(29)
+  expect(daysInMonth(2004, 2)).toBe(29)
+})
+
+it('Days in Month with wrong parameter types', () => {
+  expect(daysInMonth(Number.NaN, 5)).toBeNaN()
+  expect(daysInMonth(2013, Number.NaN)).toBeNaN()
+})