);

            UpgradeResult merged = result1.merge(result2);

            assertTrue(merged.success(), "Merged result should be successful");
            assertEquals(2, merged.processedPoms().size(), "Should merge processed POMs");
            assertEquals(2, merged.modifiedPoms().size(), "Should merge modified POMs");
            assertTrue(merged.processedPoms().contains(pom1), "Should contain overlapping POM");

        SuggestItem item2 = createItem("text", 20L, 15L, 2.0f);

        SuggestItem merged = SuggestItemMerger.merge(item1, item2);

        assertNotNull(merged);
        assertEquals(30L, merged.getDocFreq()); // 10 + 20
        assertEquals(20L, merged.getQueryFreq()); // 5 + 15
        assertEquals(2.0f, merged.getUserBoost(), 0.001f); // max(1.0, 2.0)
    }

    @Test
    public void testMerge_tags() {

	return clone
}

func (l lastDayTierStats) merge(m lastDayTierStats) (merged lastDayTierStats) {
	cl := l.clone()
	cm := m.clone()

	if cl.UpdatedAt.After(cm.UpdatedAt) {
		cm.forwardTo(cl.UpdatedAt)
		merged.UpdatedAt = cl.UpdatedAt
	} else {
		cl.forwardTo(cm.UpdatedAt)
		merged.UpdatedAt = cm.UpdatedAt
	}

	for i := range cl.Bins {
		merged.Bins[i] = cl.Bins[i].add(cm.Bins[i])
	}

	return merged

    }

    @Override
    public void merge(File existing, File result) throws RepositoryException {
        merge(existing != null ? existing.toPath() : null, result != null ? result.toPath() : null);
    }

    @Override
    public void merge(Path existing, Path result) throws RepositoryException {
        Metadata recessive = read(existing);

        merge(recessive);

        write(result, metadata);

        SuggestItem merged = SuggestItem.merge(item1, item2);

        assertNotNull(merged);
        assertEquals("item1", merged.getText());
        assertEquals(150L, merged.getQueryFreq()); // Sum of frequencies
        assertEquals(75L, merged.getDocFreq()); // Sum of frequencies
        assertEquals(1.5f, merged.getUserBoost(), 0.001f); // Takes item2's boost

class MavenToolchainMergerTest {
    private MavenToolchainMerger merger = new MavenToolchainMerger();

    private DefaultToolchainsReader reader = new DefaultToolchainsReader();

    @Test
    void testMergeNulls() {
        merger.merge(null, null, null);

        PersistedToolchains pt = new PersistedToolchains();
        merger.merge(pt, null, null);
        merger.merge(null, pt, null);
    }

    @Test

        SuggestItem merged = SuggestItem.merge(item1, item2);

        // Should have all 3 kinds
        assertEquals(3, merged.getKinds().length);
        assertTrue(Arrays.asList(merged.getKinds()).contains(SuggestItem.Kind.QUERY));
        assertTrue(Arrays.asList(merged.getKinds()).contains(SuggestItem.Kind.DOCUMENT));
        assertTrue(Arrays.asList(merged.getKinds()).contains(SuggestItem.Kind.USER));
    }

			// Same, discard one.
			merged = append(merged, a[0])
			a = a[1:]
			b = b[1:]
		case a[0].name < b[0].name:
			merged = append(merged, a[0])
			a = a[1:]
		default:
			merged = append(merged, b[0])
			b = b[1:]
		}
		if limit > 0 && len(merged) >= limit {
			break
		}
	}
	// Append anything left.
	if limit < 0 || len(merged) < limit {
		merged = append(merged, a...)

            metadata.storeInLocalRepository(localRepo, localRepo);
            merged = true;
        } catch (Exception e) {
            throw new RepositoryException(e.getMessage(), e);
        }
    }

    @Override
    public boolean isMerged() {
        return merged;
    }

    @Override
    public String getGroupId() {
        return emptify(metadata.getGroupId());
    }

    }

    /**
     * Merges two suggest items.
     * @param item1 The first suggest item.
     * @param item2 The second suggest item.
     * @return The merged suggest item.
     */
    public static SuggestItem merge(final SuggestItem item1, final SuggestItem item2) {
        return SuggestItemMerger.merge(item1, item2);
    }

    /**