TestSearchLogEvent event = new TestSearchLogEvent("id", 1L, "type");

        // Initial empty map
        Map<String, Object> map1 = new HashMap<>();
        event.setSourceMap(map1);
        assertEquals(0, event.toSource().size());

        // Add elements to the map
        map1.put("key1", "value1");
        assertEquals(1, event.toSource().size());

        // Replace the map

              }
            });
  }

  public void testEquals() {
    Map<Integer, String> map1 = ImmutableMap.of(1, "one");
    Map<Integer, String> map2 = ImmutableMap.of(2, "two");
    new EqualsTester()
        .addEqualityGroup(map1, wrap(map1), wrap(map1))
        .addEqualityGroup(map2, wrap(map2))
        .testEquals();
  }

      HashMap<Object, Object> map1,
      HashMap<Object, Object> map2)
      throws Exception {
    // Only start measuring table size after the first element inserted, to
    // deal with empty-map optimization.
    map1.put(0, null);

    int initialBuckets = bucketsOf(map1);

    for (int i = 1; i < size; i++) {
      map1.put(i, null);
    }

        @SuppressWarnings("unchecked")
        List<Map<String, Object>> resultList = (List<Map<String, Object>>) result;
        assertEquals(2, resultList.size());

        Map<String, Object> map1 = resultList.get(0);
        assertEquals("name1", map1.get("name"));

        Map<String, Object> map2 = resultList.get(1);
        assertEquals("name2", map2.get("name"));
    }

    @Test
    public void test_register_entitySet() {