@Test
public void should_copy_given_file_from_source_directory() throws Exception {

    write(source.toPath().resolve("pbButton.json"), "contents".getBytes());
    visitor.visitFile(source.toPath().resolve("pbButton.json"), null);
    assertThat(readAllBytes(destination.toPath().resolve("pbButton.json"))).isEqualTo("contents".getBytes());
}