✅ Fix tests

tests/unit/Testables/Filesystem/RealFileSystemTest.swift

@@ -0,0 +1,21 @@
+//
+//  RealFileSystemTest.swift
+//  Unit Tests
+//
+//  Created by Nico Verbruggen on 02/11/2022.
+//  Copyright © 2022 Nico Verbruggen. All rights reserved.
+//
+
+import XCTest
+
+class RealFileSystemTest: XCTestCase {
+
+    override class func setUp() {
+        ActiveFileSystem.useSystem()
+    }
+
+    func test_testable_fs_is_in_use() {
+        XCTAssertTrue(FileSystem is RealFileSystem)
+    }
+
+}