restructure

iOS/RSSuperTests/DateExtensionsTests.swift

@@ -0,0 +1,56 @@
+//
+//  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)
+    }
+}