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        [Test]
@Test
       public void load_all_of_file_using_delegate_with_mock()

       {
   
        // arrange
            stringString fileToLoad = "c:/tmp/KeyboardHandler.java.txt";
 
          FileLoader cut = new FileLoader( fileToLoad );
        // setup ur canned data, these will represent the lines  List<string>in the file
        ArrayList<String> pretendFileContent = new ArrayList<>();

           pretendFileContent.Addadd("Hello");
 
          pretendFileContent.Addadd("world");
            int expectedBytesRead = 10;
        
        var// Mock the interface
        MyFile file = Substitute.For<MyFile>();
   mock(MyFile.class);
        
        // Setup the expectation
        when(file.readAllLines(Paths.ReadLinesget(fileToLoad), StandardCharsets.UTF_8)).ReturnsthenReturn(pretendFileContent);
        
    // act   // act
        int bytesRead = cut.LoadFileloadFile(fileToLoad, (fname) =->
   
        {
                IEnumerable<string>List<String> result = file.ReadLines(fileToLoad);

  readAllLines(Paths.get(fname), StandardCharsets.UTF_8);

            return result;
        });
   });     
         // assert
            Assert.AreEqualassertEquals(expectedBytesRead, bytesRead);        
     }