Object key = getReportSetKey().apply(element);
                    ReportSet existing = merged.get(key);
                    if (existing != null) {
                        element = mergeReportSet(existing, element, sourceDominant, context);
                    }
                    merged.put(key, element);
                }

                builder.reportSets(merged.values());
            }

                    Object key = getReportSetKey().apply(element);
                    ReportSet existing = merged.get(key);
                    if (existing != null) {
                        element = mergeReportSet(existing, element, sourceDominant, context);
                    }
                    merged.put(key, element);
                }

                builder.reportSets(merged.values());
            }

        target.setReports( Arrays.asList( "first", "second", "third" ) );
        ReportSet source = new ReportSet();
        source.setReports( Arrays.asList( "first", "second", "third" ) );

        modelMerger.mergeReportSet( target, source, true, null );

        assertThat( target.getReports(), contains( "first", "second", "third" ) );
    }

    @Test
    public void mergeSameRepositories()
    {

            for (ReportSet element : tgt) {
                Object key = getReportSetKey().apply(element);
                ReportSet existing = merged.get(key);
                if (existing != null) {
                    mergeReportSet(element, existing, sourceDominant, context);
                }
                merged.put(key, element);
            }

            builder.reportSets(merged.values());
        }
    }