Create RFC339NoTimeDateFormatterTests.swift

WordPressKitTests/RFC339NoTimeDateFormatterTests.swift

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+import XCTest
+@testable import WordPressKit
+
+final class RFC339NoTimeDateFormatterTests: XCTestCase {
+ func testDateFromString_DTS() {
+ // Given we pass a time zone and date string that has a
+ // daylight saving time shift happening
+ let timeZone = TimeZone(identifier: "America/Asuncion")!
+ let sut = RFC339NoTimeDateFormatter(currentTimeZone: timeZone)
+ let ordinaryFormatter = ordinaryFormatter(currentTimeZone: timeZone)
+ let dateString = "2023-10-01"
+
+ // When we turn dateString to date
+ // Then ordinary formatter fails to convert DST dateString to string
+ XCTAssertNil(ordinaryFormatter.date(from: dateString))
+
+ // and SUT formatter converts DST dateString to string
+ XCTAssertNotNil(sut.date(from: dateString))
+ }
+
+ func testDateFromString() {
+ // Given we pass an ordinary date
+ let timeZone = TimeZone(identifier: "Europe/Vilnius")!
+ let sut = RFC339NoTimeDateFormatter(currentTimeZone: timeZone)
+ let ordinaryFormatter = ordinaryFormatter(currentTimeZone: timeZone)
+ let dateString = "2024-01-03"
+
+ // When we turn dateString to date
+ // Then ordinary formatter and SUT formatter should return the same date
+ XCTAssertEqual(
+ sut.date(from: dateString),
+ ordinaryFormatter.date(from: dateString)
+ )
+ }
+
+ func testStringFromDate_DTS() {
+ let timeZone = TimeZone(identifier: "America/Asuncion")!
+ let sut = RFC339NoTimeDateFormatter(currentTimeZone: timeZone)
+ let ordinaryFormatter = ordinaryFormatter(currentTimeZone: timeZone)
+
+ let date = date(year: 2023, month: 10, day: 01, timeZone: timeZone)
+
+ XCTAssertEqual(sut.string(from: date), "2023-10-01")
+ XCTAssertEqual(ordinaryFormatter.string(from: date), "2023-10-01")
+ }
+
+ func testStringFromDate() {
+ let timeZone = TimeZone(identifier: "Australia/Adelaide")!
+ let sut = RFC339NoTimeDateFormatter(currentTimeZone: timeZone)
+
+ let date1 = date(year: 2023, month: 02, day: 02, hour: 23, timeZone: timeZone)
+ XCTAssertEqual(sut.string(from: date1), "2023-02-02")
+
+ let date2 = date(year: 2023, month: 02, day: 02, hour: 01, timeZone: timeZone)
+ XCTAssertEqual(sut.string(from: date2), "2023-02-02")
+ }
+}
+
+extension RFC339NoTimeDateFormatterTests {
+ private func ordinaryFormatter(currentTimeZone: TimeZone) -> DateFormatter {
+ let df = DateFormatter()
+ df.locale = Locale(identifier: "en_US_POSIX")
+ df.dateFormat = "yyyy-MM-dd"
+ df.timeZone = currentTimeZone
+ return df
+ }
+
+ private func date(year: Int, month: Int, day: Int, hour: Int? = nil, timeZone: TimeZone) -> Date {
+ let calendar = Calendar(identifier: .iso8601)
+ let dateComponents = DateComponents(calendar: calendar, timeZone: timeZone, year: year, month: month, day: day, hour: hour)
+ return dateComponents.date!
+ }
+}