feat: move the calculation of the current salutation to a different function

src/helpers/hourToSalutation.test.ts

@@ -0,0 +1,34 @@
+import {describe, it, expect} from 'vitest'
+
+import {hourToSalutation} from './hourToSalutation'
+
+const dateWithHour = (hours: number): Date => {
+	const date = new Date()
+	date.setHours(hours)
+	return date
+}
+
+describe('Salutation', () => {
+	it('shows the right salutation in the night', () => {
+		const salutation = hourToSalutation(dateWithHour(4))
+		expect(salutation).toBe('Night')
+	})
+	it('shows the right salutation in the morning', () => {
+		const salutation = hourToSalutation(dateWithHour(8))
+		expect(salutation).toBe('Morning')
+	})
+	it('shows the right salutation in the day', () => {
+		const salutation = hourToSalutation(dateWithHour(13))
+		expect(salutation).toBe('Day')
+	})
+	it('shows the right salutation in the night', () => {
+		const salutation = hourToSalutation(dateWithHour(20))
+		expect(salutation).toBe('Evening')
+	})
+	it('shows the right salutation in the night again', () => {
+		const salutation = hourToSalutation(dateWithHour(23))
+		expect(salutation).toBe('Night')
+	})
+})
+
+

src/helpers/hourToSalutation.ts

@@ -0,0 +1,21 @@
+export function hourToSalutation(now: Date = new Date()): String {
+	const hours = new Date(now).getHours()
+
+	if (hours < 5) {
+		return 'Night'
+	}
+
+	if (hours < 11) {
+		return 'Morning'
+	}
+
+	if (hours < 18) {
+		return 'Day'
+	}
+
+	if (hours < 23) {
+		return 'Evening'
+	}
+
+	return 'Night'
+}