parent.setArtifactId("apache");
        parent.setVersion("0");

        UnresolvableModelException e = assertThrows(
                UnresolvableModelException.class,
                () -> newModelResolver().resolveModel(parent),
                "Expected 'UnresolvableModelException' not thrown.");
        assertNotNull(e.getMessage());
        assertTrue(e.getMessage().contains("Could not find artifact org.apache:apache:pom:0 in central"));

     */
    ModelSource resolveModel(String groupId, String artifactId, String version) throws UnresolvableModelException;

    /**
     * Tries to resolve the POM for the specified parent coordinates possibly updating {@code parent}.
     * <p>
     * Unlike the {@link #resolveModel(java.lang.String, java.lang.String, java.lang.String)} method, this method

        parent.setArtifactId("artifact");
        parent.setVersion("0");

        UnresolvableModelException e = assertThrows(
                UnresolvableModelException.class,
                () -> newModelResolver().resolveModel(parent),
                "Expected 'UnresolvableModelException' not thrown.");
        assertNotNull(e.getMessage());
        assertTrue(e.getMessage().contains("Could not find artifact ut.simple:artifact:pom:0 in repo"));

                default -> null;
            };
        }

        @Override
        public ModelSource resolveModel(Parent parent) throws UnresolvableModelException {
            return null;
        }

        @Override
        public ModelSource resolveModel(Dependency dependency) throws UnresolvableModelException {
            return null;
        }

        @Override

            }
        }
    }

    @Override
    public ModelResolver newCopy() {
        return new DefaultModelResolver(this);
    }

    @Override
    public ModelSource resolveModel(String groupId, String artifactId, String version)
            throws UnresolvableModelException {
        Artifact pomArtifact = new DefaultArtifact(groupId, artifactId, "", "pom", version);

        try {

            }
        }
    }

    @Override
    public ModelResolver newCopy() {
        return new ProjectModelResolver(this);
    }

    @Override
    public ModelSource resolveModel(String groupId, String artifactId, String version)
            throws UnresolvableModelException {
        File pomFile = null;

        if (modelPool != null) {

              <!--              <exclude>org.apache.maven.model.resolution.ModelResolver#resolveModel(org.apache.maven.api.model.Parent,java.util.concurrent.atomic.AtomicReference):METHOD_NEW_DEFAULT</exclude>-->
              <!--              <exclude>org.apache.maven.model.resolution.ModelResolver#resolveModel(org.apache.maven.api.model.Dependency,java.util.concurrent.atomic.AtomicReference):METHOD_NEW_DEFAULT</exclude>-->

                        ModelProblemUtils.toSourceHint(childModel)));

        ModelSource modelSource;
        try {
            modelSource = modelResolver.resolveModel(parent);
        } catch (UnresolvableModelException e) {
            // Message below is checked for in the MNG-2199 core IT.
            StringBuilder buffer = new StringBuilder(256);