@Test
 public void getStoredConnectorsNonStored_shouldReturnEmptySet() {
   Set<String> connectors = store.getStoredConnectors("foo");
   assertThat(connectors.isEmpty(), is(true));
 }
 @Test
 public void getStoredConnectors_shouldReturnAllConnectors() {
   Set<String> connectors = store.getStoredConnectors("test");
   assertThat(connectors.size(), is(1));
   assertThat(connectors.iterator().next(), is("42"));
 }