Implemented the "asString" computed property for the TimeInterval+Computed extension in the library target.

Tests/MarvelService/Types/Extensions/Tag+Customs.swift

@@ -0,0 +1,21 @@
+//===----------------------------------------------------------------------===
+//
+// This source file is part of the MarvelService open source project
+//
+// Copyright (c) 2025 Röck+Cöde VoF. and the MarvelService project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE for license information
+// See CONTRIBUTORS for the list of MarvelService project authors
+//
+//===----------------------------------------------------------------------===
+
+import Testing
+
+extension Tag {
+    
+    // MARK: Constants
+    
+    /// A flag that indicates tests for a type extension.
+    @Tag static var `extension`: Self
+}

Tests/MarvelService/Types/Samples/Input.swift

@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===
+//
+// This source file is part of the MarvelService open source project
+//
+// Copyright (c) 2025 Röck+Cöde VoF. and the MarvelService project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE for license information
+// See CONTRIBUTORS for the list of MarvelService project authors
+//
+//===----------------------------------------------------------------------===
+
+import struct Foundation.Date
+import struct Foundation.TimeInterval
+
+/// A namespace assigned for input arguments on test cases.
+enum Input {
+    
+    // MARK: Constants
+
+    /// A list of timestamps samples.
+    static let timestamps: [TimeInterval] = [
+        Date(timeIntervalSince1970: 0).timeIntervalSince1970,
+        Date(timeIntervalSince1970: 1_000).timeIntervalSince1970,
+        Date(timeIntervalSince1970: 1_000_000).timeIntervalSince1970,
+        Date(timeIntervalSince1970: 1_000_000_000).timeIntervalSince1970,
+    ]
+}

Tests/MarvelService/Types/Samples/Output.swift

@@ -0,0 +1,14 @@
+//===----------------------------------------------------------------------===
+//
+// This source file is part of the MarvelService open source project
+//
+// Copyright (c) 2025 Röck+Cöde VoF. and the MarvelService project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE for license information
+// See CONTRIBUTORS for the list of MarvelService project authors
+//
+//===----------------------------------------------------------------------===
+
+/// A namespace assigned for output arguments on test cases, that are expected results.
+enum Output {}