    @Test
    public void parseContainerIdFromHostname() {

        assertThat(RecommendationVerticle.parseContainerIdFromHostname("recommendation-v1-abcdef"), equalTo("abcdef"));
        assertThat(RecommendationVerticle.parseContainerIdFromHostname("recommendation-v2-abcdef"), equalTo("abcdef"));
        assertThat(RecommendationVerticle.parseContainerIdFromHostname("recommendation-v10-abcdef"), equalTo("abcdef"));
        assertThat(RecommendationVerticle.parseContainerIdFromHostname("unknown"), equalTo("unknown"));
        assertThat(RecommendationVerticle.parseContainerIdFromHostname("localhost"), equalTo("localhost"));
    }