public void shouldThrowErrorIfFilesToSelectIsNull() {
   try {
     driver.selectFiles(fileChooser, null);
     failWhenExpectingException();
   } catch (NullPointerException e) {
     assertThat(e.getMessage()).isEqualTo("The files to select should not be null");
   }
 }
 public void shouldThrowErrorIfAnyFileToSelectIsNull() {
   try {
     driver.selectFiles(fileChooser, array(new File("Fake"), null));
     failWhenExpectingException();
   } catch (NullPointerException e) {
     assertThat(e.getMessage())
         .isEqualTo("The array of files to select should not contain null elements");
   }
 }