Update TestFileManager.swift

Author: compnerd

Diff for: Tests/Foundation/Tests/TestFileManager.swift

@@ -759,8 +759,8 @@ class TestFileManager : XCTestCase {
         let file = subdirectory.appendingPathComponent("file", isDirectory: false)
         try? fm.removeItem(at: root)
 
-        XCTAssertNoThrow(fm.createDirectory(at: subdirectory, withIntermediateDirectories: true, attributes: nil))
-        XCTAssertNoThrow(fm.createFile(atPath: file.path, contents: Data(), attributes: nil))
+        try XCTAssertNoThrow(fm.createDirectory(at: subdirectory, withIntermediateDirectories: true, attributes: nil))
+        try XCTAssertNoThrow(fm.createFile(atPath: file.path, contents: Data(), attributes: nil))
         let contents = try XCTUnwrap(fm.contentsOfDirectory(at: root, includingPropertiesForKeys: [.isDirectoryKey], options: [.skipsHiddenFiles]))
         XCTAssertEqual(contents.count, 2)
         XCTAssertEqual(contents, [subdirectory, file])