Test case to test TimeZone.localizedName

Author: “saiHemak”

TestFoundation/TestNSTimeZone.swift

@@ -35,7 +35,7 @@ class TestNSTimeZone: XCTestCase {
             ("test_computedPropertiesMatchMethodReturnValues", test_computedPropertiesMatchMethodReturnValues),
             ("test_initializingTimeZoneWithOffset", test_initializingTimeZoneWithOffset),
             ("test_initializingTimeZoneWithAbbreviation", test_initializingTimeZoneWithAbbreviation),
-
+            ("test_localizedName", test_localizedName),
             // Also disabled due to https://bugs.swift.org/browse/SR-300
             // ("test_systemTimeZoneUsesSystemTime", test_systemTimeZoneUsesSystemTime),
         ]
@@ -117,6 +117,20 @@ class TestNSTimeZone: XCTestCase {
         let known = NSTimeZone.knownTimeZoneNames
         XCTAssertNotEqual([], known, "known time zone names not expected to be empty")
     }
+    
+    func test_localizedName(){
+        let initialTimeZone = NSTimeZone.default
+        NSTimeZone.default = TimeZone(identifier: "America/New_York")!
+        let defaultTimezone = NSTimeZone.default
+        let localeL = Locale(identifier: "en_US")
+        XCTAssertEqual(defaultTimezone.localizedName(for: NSTimeZone.NameStyle.standard, locale: localeL), "Eastern Standard Time")
+        XCTAssertEqual(defaultTimezone.localizedName(for: NSTimeZone.NameStyle.shortStandard, locale: localeL), "EST")
+        XCTAssertEqual(defaultTimezone.localizedName(for: NSTimeZone.NameStyle.generic, locale: localeL), "Eastern Time")
+        XCTAssertEqual(defaultTimezone.localizedName(for: NSTimeZone.NameStyle.daylightSaving, locale: localeL), "Eastern Daylight Time")
+        XCTAssertEqual(defaultTimezone.localizedName(for: NSTimeZone.NameStyle.shortDaylightSaving, locale: localeL), "EDT")
+        XCTAssertEqual(defaultTimezone.localizedName(for: NSTimeZone.NameStyle.shortGeneric, locale: localeL), "ET")
+        NSTimeZone.default = initialTimeZone //reset the Timezone
+    }
 
     func test_initializingTimeZoneWithOffset() {
         let tz = TimeZone(identifier: "GMT-0400")