@Test
    public final void uploadFile() throws Exception {
        String testInput = "content";
        s3Client.putObject(MY_TEST_BUCKET, "file.txt", testInput);

        List<S3ObjectSummary> summaries = s3Client
                .listObjects(MY_TEST_BUCKET)
                .getObjectSummaries();
        assertThat(summaries).hasSize(1);
        assertThat(summaries.get(0).getKey()).isEqualTo("file.txt");
        assertThat(summaries.get(0).getSize()).isEqualTo(testInput.length());
    }
This is an example of how one would use the S3Proxy JUnit extension in a unit
test as opposed to a proper test of the S3ProxyExtension class.
src/test/java/org/gaul/s3proxy/junit/S3ProxyExtensionTest.java