/**
 *
 * @since 3.2.4
 * @deprecated since 4.0.0, use {@link org.apache.maven.toolchain.v4.MavenToolchainsMerger} instead
 */
@Deprecated(since = "4.0.0")
public class MavenToolchainMerger {

    public void merge(PersistedToolchains dominant, PersistedToolchains recessive, String recessiveSourceLevel) {
        if (dominant == null || recessive == null) {
            return;
        }

              <exclude>org.apache.maven.toolchain.merge.MavenToolchainMerger#getToolchainModelKey(org.apache.maven.toolchain.model.ToolchainModel):METHOD_REMOVED</exclude>

import org.codehaus.plexus.util.xml.Xpp3Dom;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;

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

    private DefaultToolchainsReader reader = new DefaultToolchainsReader();

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