Created MockService file

GitExplorerTests/MockService.swift

@@ -0,0 +1,34 @@
+//
+//  MockService.swift
+//  GitExplorerTests
+//
+//  Created by Diggo Silva on 03/10/25.
+//
+
+import XCTest
+import Combine
+@testable import GitExplorer
+
+class Mock: ServiceProtocol {
+
+    var isSuccess: Bool = true
+
+    func getUser(with username: String) async throws -> User {
+        if isSuccess {
+            return User(login: username, avatarUrl: "", url: "", htmlURL: "", publicRepos: 4, publicGists: 3, followers: 2, following: 1, createdAt: Date())
+        } else {
+            throw DSError.invalidUsername
+        }
+    }
+
+    func getRepos(with username: String) async throws -> [Repo] {
+        if isSuccess {
+            return [
+                Repo(name: "FirstRepo", repoDescription: nil, createdAt: Date(), updatedAt: Date(), stargazersCount: 4, forksCount: 3),
+                Repo(name: "SecondRepo", repoDescription: nil, createdAt: Date(), updatedAt: Date(), stargazersCount: 2, forksCount: 1)
+            ]
+        } else {
+            throw DSError.reposFailed
+        }
+    }
+}