S3FilesResourceTest - refactored

S3FilesResourceTest.java

public class S3FilesResourceTest {

    private static class FakeS3Facade implements S3Facade {
        List<S3File> fileList;

        public List<S3File> listObjects(String bucketName) {
            return fileList;
        }
    }

    private S3FilesResource resource;
    private FakeS3Facade fakeS3;

    @Before
    public void setUp() throws Exception {
        fakeS3 = new FakeS3Facade();
        resource = new S3FilesResource();
        resource.amazonS3Client = fakeS3;
    }

    @Test
    public void excludeDirectories() throws Exception {
        S3File s3File = new S3File("file", "/file.xx");
        fakeS3.fileList = asList(new S3File("dir", "/my/dir/"), s3File);
        assertThat(resource.fetchS3Files())
            .hasSize(1)
            .contains(s3File);
    }

    /** Simplest possible test of listS3Files */
    @Test
    public void renderToHtml() throws Exception {
        fakeS3.fileList = asList(new S3File("file", "/file.xx"));
        assertThat(resource.listS3Files())
            .contains("/file.xx");
    }
}