Get file name w/o extension

private String FILE_PATH = "com/levelup/java/io/sample.md";

@Test
public void get_file_name_with_out_extension_java () {

    String separator = System.getProperty("file.separator");

    int indexOfLastSeparator = FILE_PATH.lastIndexOf(separator);
    String filename = FILE_PATH.substring(indexOfLastSeparator + 1);

    int extensionIndex = filename.lastIndexOf(".");
    String fileExtension = filename.substring(0, extensionIndex);

    assertEquals("sample", fileExtension);
}

@Test
public void get_file_name_with_out_extension_guava () {

    String fileName = Files.getNameWithoutExtension(FILE_PATH);
    assertEquals("sample", fileName);
}

@Test
public void get_file_name_with_out_extension_apache () {

    String fileName = FilenameUtils.getBaseName(FILE_PATH);
    assertEquals("sample", fileName);
}