assertEquals("parent-context", childTrace.context());
        assertEquals("child-data", childTrace.data());
    }

    @Test
    void testPredefinedContexts() {
        assertEquals("plugin", RequestTrace.CONTEXT_PLUGIN);
        assertEquals("project", RequestTrace.CONTEXT_PROJECT);
        assertEquals("bootstrap", RequestTrace.CONTEXT_BOOTSTRAP);
    }

    @Test
    void testNullValues() {

   |   Maven will search for 1.5 and above.
   |
   | * configuration: Additional configuration for this tool.
   |   Look for documentation of the toolchains-aware plugin which configuration elements
   |   can be used.
   |
   | See also https://maven.apache.org/guides/mini/guide-using-toolchains.html
   |
   | General example

  <toolchain>
    <type/>
    <provides>

import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.function.Consumer;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.apache.maven.plugin.MojoExecution;
import org.apache.maven.project.MavenProject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * <p>
 * Logs debug output from the various lifecycle phases.
 * </p>

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.plugin;

import java.util.List;

/**
 * InvalidPluginDescriptorException
 */
public class InvalidPluginDescriptorException extends Exception {

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.plugin.descriptor;

/**
 * Describes a component requirement.
 *
 */
public class Requirement implements Cloneable {
    private final String role;

    private final String roleHint;

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.execution;

import org.apache.maven.plugin.MojoExecutionException;

/**
 * <p>
 * Extension point that allows build extensions observe and possibly veto mojo executions.
 * </p>

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.plugin;

import javax.inject.Named;
import javax.inject.Singleton;

import java.util.List;

import org.apache.maven.execution.MavenSession;
import org.apache.maven.lifecycle.LifecycleExecutionException;

/**

        excludedPackages.add("org.gradle.plugins.ide.eclipse.model");
        excludedPackages.add("org.gradle.plugins.ide.idea.model");
        excludedPackages.add("org.gradle.api.tasks.testing.logging");

        // TODO - rename some incubating types to remove collisions and then remove these exclusions
        excludedPackages.add("org.gradle.plugins.binaries.model");

 * based on include/exclude patterns. This service provides a clean API for plugins
 * to create path matchers without directly depending on implementation classes.
 * <p>
 * The path matchers created by this service support Maven's traditional include/exclude
 * pattern syntax, which is compatible with the behavior of Maven 3 plugins like
 * maven-compiler-plugin and maven-clean-plugin.
 * <p>
 * Pattern syntax supports:
 * <ul>

     * {@return a matcher combining the include and exclude patterns}
     * If the user did not specify any includes, the given {@code defaultIncludes} are used.
     * These defaults depend on the plugin.
     * For example, the default include of the Java compiler plugin is <code>"**&sol;*.java"</code>.
     *
     * <p>If the user did not specify any excludes, the default is often files generated