Extend build-in support for Documents and Library folders to more pla…

…tforms (#122)

This change makes the built-in APIs for retrieving the system-provided
`Documents` and `Library` folders available on iOS and tvOS, as well as
macOS (which was already supported).

Sources/Files.swift

@@ -903,11 +903,7 @@ public extension Folder {
             fileManager: fileManager
         ))
     }
-}
-#endif
 
-#if os(macOS)
-public extension Folder {
     /// The current user's Documents folder
     static var documents: Folder? {
         return try? .matching(.documentDirectory)

Tests/FilesTests/FilesTests.swift

@@ -916,8 +916,20 @@ class FilesTests: XCTestCase {
     ]
 }
 
+#if os(macOS)
+extension FilesTests {
+    func testAccessingDocumentsFolder() {
+        XCTAssertNotNil(Folder.documents, "Documents folder should be available.")
+    }
+}
+#endif
+
 #if os(iOS) || os(tvOS) || os(macOS)
 extension FilesTests {
+    func testAccessingLibraryFolder() {
+        XCTAssertNotNil(Folder.library, "Library folder should be available.")
+    }
+
     func testResolvingFolderMatchingSearchPath() {
         performTest {
             // Real file I/O
@@ -950,15 +962,3 @@ extension FilesTests {
     }
 }
 #endif
-
-#if os(macOS)
-extension FilesTests {
-    func testAccessingDocumentFolder() {
-        XCTAssertNotNil(Folder.documents, "Document folder should be available.")
-    }
-
-    func testAccessingLibraryFolder() {
-        XCTAssertNotNil(Folder.library, "Library folder should be available.")
-    }
-}
-#endif