chore(tests): include local formatTime test with custom locale

tests/datetime/formatTime.luau

@@ -1,4 +1,5 @@
 local DateTime = require("@lune/DateTime")
+local process = require("@lune/Process")
 
 -- UTC Timezone
 assert(
@@ -10,20 +11,42 @@ assert(
 assert(
 	DateTime.fromUnixTimestamp(1693068988):formatTime("utc", "%A, %d %B %Y", "fr")
 		== "samedi, 26 août 2023",
-	"expected format specifier '%A, %d %B %Y' to return 'samedi, 26 août 2023' for locale 'fr'"
+	"expected format specifier '%A, %d %B %Y' to return 'samedi, 26 août 2023' for locale 'fr' (UTC)"
 )
 
 local expectedTimeString = os.date("%Y-%m-%dT%H:%M:%SZ", 1694078954)
 
-print(
-	expectedTimeString,
-	DateTime.fromUnixTimestamp(1694078954):formatTime("local", "%Y-%m-%dT%H:%M:%SZ", "en")
-)
-
 assert(
 	DateTime.fromUnixTimestamp(1694078954):formatTime("local", "%Y-%m-%dT%H:%M:%SZ", "en")
 		== expectedTimeString,
 	"invalid ISO 8601 formatting for DateTime.formatTime() (local)"
 )
 
--- TODO: Locale tests, by using os.date()
+-- This test requires 'fr_FR.UTF-8 UTF-8' to be in /etc/locale.gen to pass
+-- Local Timezone
+
+assert(
+	DateTime.fromUnixTimestamp(1694078954):formatTime("local", "%Y-%m-%dT%H:%M:%SZ", "en")
+		== expectedTimeString,
+	"invalid ISO 8601 formatting for DateTime.formatTime() (local)"
+)
+
+local expectedLocalizedString
+
+local dateCmd = process.spawn("bash", { "-c", "date +\"%A, %d %B %Y\" --date='@1693068988'" }, {
+	env = {
+		LC_ALL = "fr_FR.UTF-8 ",
+	},
+})
+
+if dateCmd.ok then
+	expectedLocalizedString = dateCmd.stdout
+else
+	error("Failed to execute date command")
+end
+
+assert(
+	DateTime.fromUnixTimestamp(1693068988):formatTime("local", "%A, %d %B %Y", "fr")
+		== expectedLocalizedString:gsub("\n", ""),
+	"expected format specifier '%A, %d %B %Y' to return 'samedi, 26 août 2023' for locale 'fr' (local)"
+)

types/DateTime.luau

@@ -42,11 +42,6 @@ export type DateTimeValues = {
 	millisecond: number,
 }
 
-export type DateTime = {
-	unixTimestamp: number,
-	unixTimestampMillis: number,
-}
-
 --[=[
 	@class DateTime
 
@@ -85,7 +80,10 @@ export type DateTime = {
 	DateTime.now():toUniversalTime() 
 	```
 ]=]
-local dateTime = {}
+local dateTime = {
+	unixTimestamp = 0,
+	unixTimestampMillis = 0,
+}
 
 --[=[
 	@within DateTime
@@ -94,7 +92,7 @@ local dateTime = {}
 
     @return A DateTime instance
 ]=]
-function dateTime.now(): DateTime
+function dateTime.now(): typeof(dateTime)
 	return nil :: any
 end
 
@@ -107,7 +105,7 @@ end
 	@param unixTimestamp The number of seconds or milliseconds (or both) since the Unix epoch. The fraction part of a float denotes the milliseconds.
 	@return A DateTime instance
 ]=]
-function dateTime.fromUnixTimestamp(unixTimestamp: number?): DateTime
+function dateTime.fromUnixTimestamp(unixTimestamp: number?): typeof(dateTime)
 	return nil :: any
 end
 
@@ -126,7 +124,7 @@ end
 	@param dateTime Optional values for the dateTime instance, defaults to the current time
 	@return A DateTime instance
 ]=]
-function dateTime.fromUniversalTime(dateTime: DateTimeValues?): DateTime
+function dateTime.fromUniversalTime(dateTime: DateTimeValues?): typeof(dateTime)
 	return nil :: any
 end
 
@@ -145,7 +143,7 @@ end
 	@param dateTime Optional values for the dateTime instance, defaults to the current time
 	@return A DateTime instance
 ]=]
-function dateTime.fromLocalTime(dateTime: DateTimeValues?): DateTime
+function dateTime.fromLocalTime(dateTime: DateTimeValues?): typeof(dateTime)
 	return nil :: any
 end
 
@@ -162,7 +160,7 @@ end
 	@param isoDate An ISO 8601 formatted string
 	@return A DateTime instance
 ]=]
-function dateTime.fromIsoDate(iso_date: string): DateTime?
+function dateTime.fromIsoDate(iso_date: string): typeof(dateTime)?
 	return nil :: any
 end
 
@@ -225,4 +223,6 @@ function dateTime:formatTime(timezone: Timezone, formatString: string, locale: L
 	return nil :: any
 end
 
+export type DateTime = typeof(dateTime)
+
 return dateTime