@Test
    public final void createExtentionWithoutCredentials() {
        S3ProxyExtension extension = S3ProxyExtension
                .builder()
                .build();
        assertThat(extension.getAccessKey()).isNull();
        assertThat(extension.getSecretKey()).isNull();
        assertThat(extension.getUri()).isNull();
    }
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