RSSuper/iOS/RSSuperTests/DateExtensionsTests.swift

//
//  DateExtensionsTests.swift
//  RSSuperTests
//
//  Created by Mike Freno on 3/29/26.
//

import XCTest
@testable import RSSuper

final class DateExtensionsTests: XCTestCase {
    
    func testMillisecondsSince1970() {
        let date = Date(timeIntervalSince1970: 1609459200)
        XCTAssertEqual(date.millisecondsSince1970, 1609459200000)
    }
    
    func testInitFromMilliseconds() {
        let date = Date(millisecondsSince1970: 1609459200000)!
        XCTAssertEqual(date.timeIntervalSince1970, 1609459200)
    }
    
    func testSecondsSince1970() {
        let date = Date(timeIntervalSince1970: 1609459200)
        XCTAssertEqual(date.secondsSince1970, 1609459200)
    }
    
    func testInitFromSeconds() {
        let date = Date(secondsSince1970: 1609459200)!
        XCTAssertEqual(date.timeIntervalSince1970, 1609459200)
    }
    
    func testISO8601String() {
        let date = Date(timeIntervalSince1970: 1609459200)
        let isoString = date.iso8601String
        
        // Verify it's a valid ISO8601 string
        let formatter = ISO8601DateFormatter()
        formatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
        XCTAssertNotNil(formatter.date(from: isoString))
    }
    
    func testInitFromISO8601String() {
        let formatter = ISO8601DateFormatter()
        formatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
        let isoString = formatter.string(from: Date(timeIntervalSince1970: 1609459200))
        
        let date = Date(iso8601String: isoString)!
        XCTAssertEqual(date.timeIntervalSince1970, 1609459200, accuracy: 1.0)
    }
    
    func testInvalidISO8601String() {
        let date = Date(iso8601String: "not-a-date")
        XCTAssertNil(date)
    }
}