Fix leadingDotSyntax test reliance on current i18n preferences

Author: jmschonfeld

Tests/FoundationInternationalizationTests/Formatting/DateFormatStyleTests.swift

@@ -190,6 +190,9 @@ private struct DateFormatStyleTests {
     @Test func leadingDotSyntax() async {
         let date = Date.now
         let locale = Locale(identifier: "es_ES")
+        let timeZone = TimeZone.gmt
+        var calendar = Calendar(identifier: .gregorian)
+        calendar.timeZone = timeZone
         await usingCurrentInternationalizationPreferences {
             #expect(date.formatted(date: .long, time: .complete) == date.formatted(Date.FormatStyle(date: .long, time: .complete)))
         }
@@ -200,13 +203,17 @@ private struct DateFormatStyleTests {
                     .month()
                     .year()
                     .locale(locale)
+                    .timeZone(timeZone)
+                    .calendar(calendar)
             ) ==
             date.formatted(
                 Date.FormatStyle()
                     .day()
                     .month()
                     .year()
                     .locale(locale)
+                    .timeZone(timeZone)
+                    .calendar(calendar)
             )
         )
     }

Tests/FoundationInternationalizationTests/Formatting/DateIntervalFormatStyleTests.swift

@@ -106,9 +106,9 @@ private struct DateIntervalFormatStyleTests {
             // This test assumes both the left side and the right side of the comparison has the same `Locale.autoupdatingCurrent`, which assumes the state of the host machine remains unchanged.
             #expect(range.formatted() == Date.IntervalFormatStyle().format(range))
             #expect(range.formatted(date: .numeric, time: .shortened) == Date.IntervalFormatStyle(date: .numeric, time: .shortened).format(range))
+            #expect(range.formatted(.interval.day().month().year().locale(locale)) == Date.IntervalFormatStyle().day().month().year().locale(locale).format(range))
         }
 
-        #expect(range.formatted(.interval.day().month().year().locale(locale)) == Date.IntervalFormatStyle().day().month().year().locale(locale).format(range))
     }
 
 #if FIXED_ICU_74_DAYPERIOD