@Test
    void testPropertiesAsMap() {
        Properties props = new Properties();
        props.setProperty("foo1", "bar1");
        props.setProperty("foo2", "bar2");
        PropertiesAsMap pam = new PropertiesAsMap(props);
        assertEquals(2, pam.size());
        Set<Entry<String, String>> set = pam.entrySet();
        assertNotNull(set);
        assertEquals(2, set.size());

    @Override
    public Map<String, String> getUserProperties() {
        return Collections.unmodifiableMap(new PropertiesAsMap(getMavenSession().getUserProperties()));
    }

    @Nonnull
    @Override
    public Map<String, String> getSystemProperties() {
        return Collections.unmodifiableMap(new PropertiesAsMap(getMavenSession().getSystemProperties()));
    }

    @Nonnull
    @Override

import org.apache.maven.api.services.ArtifactManager;
import org.apache.maven.api.services.ProjectManager;
import org.apache.maven.impl.InternalSession;
import org.apache.maven.impl.MappedList;
import org.apache.maven.impl.PropertiesAsMap;
import org.apache.maven.project.MavenProject;
import org.eclipse.sisu.Typed;

import static java.util.Objects.requireNonNull;
import static org.apache.maven.internal.impl.CoreUtils.map;

/**