diff --git a/Retos/Reto #26 - TESTING [Media]/swift/allbertoMD.swift b/Retos/Reto #26 - TESTING [Media]/swift/allbertoMD.swift
new file mode 100644
index 0000000000..b8a4ac3735
--- /dev/null
+++ b/Retos/Reto #26 - TESTING [Media]/swift/allbertoMD.swift	
@@ -0,0 +1,40 @@
+import Foundation
+import XCTest
+
+// Se aconseja usar el script en Playground para poder usar XCTest
+
+func isFriday13th(month: Int, year: Int) -> Bool {
+    
+    let calendar = Calendar.current
+    var components = DateComponents()
+    
+    components.year = year
+    components.month = month
+    components.day = 13
+    
+    if let date = calendar.date(from: components) {
+        let weekday = calendar.component(.weekday, from: date)
+        return weekday == 6
+    }
+    
+    return false
+}
+
+class IsFriday13thTests: XCTestCase {
+    
+    func testIsFriday13th() {
+        
+        XCTAssertTrue(isFriday13th(month: 8, year: 2021))
+        XCTAssertTrue(isFriday13th(month: 1, year: 2023))
+
+        
+        XCTAssertFalse(isFriday13th(month: 5, year: 2023))
+        XCTAssertFalse(isFriday13th(month: 7, year: 2025))
+    }
+}
+
+IsFriday13thTests.defaultTestSuite.run()
+
+
+
+