failureCause());
      }
      throw new IllegalStateException(
          "Expected the service " + this + " to be " + expected + ", but was " + actual);
    }
  }

  /**
   * Implementing classes should invoke this method once their service has started. It will cause
   * the service to transition from {@link State#STARTING} to {@link State#RUNNING}.
   *

  }

  public void testFindClassesToTest_withCorrespondingTestClassAndExplicitlyTested() {
    ImmutableList<Class<?>> classes = ImmutableList.of(Foo.class, FooTest.class);
    assertThat(findClassesToTest(classes, "testPublic")).isEmpty();
    assertThat(findClassesToTest(classes, "testNotThere", "testPublic")).isEmpty();
  }

  public void testFindClassesToTest_withCorrespondingTestClass_noTestName() {

        buf.append("},");
        final Classes classes = jvmStats.getClasses();
        buf.append("\"classes\":{");
        append(buf, "loaded", () -> classes.getLoadedClassCount()).append(',');
        append(buf, "total_loaded", () -> classes.getTotalLoadedClassCount()).append(',');
        append(buf, "unloaded", () -> classes.getUnloadedClassCount());
        buf.append("},");

     */
    boolean isExistClass(final String className);

    /**
     * Searches for classes handled by this instance and calls the handler for each class.
     * <p>
     * If a root package is specified at instance construction, only classes under the root package are targeted.
     * </p>
     *
     * @param handler the handler to process classes
     */
    void forEach(ClassHandler handler);

    /**

        jvmThreadsObj.peak = threads.getPeakCount();
        final Classes classes = jvmStats.getClasses();
        final JvmClassesObj jvmClassesObj = new JvmClassesObj();
        jvmObj.classes = jvmClassesObj;
        jvmClassesObj.loaded = classes.getLoadedClassCount();
        jvmClassesObj.total_loaded = classes.getTotalLoadedClassCount();
        jvmClassesObj.unloaded = classes.getUnloadedClassCount();

import org.apache.maven.api.annotations.Nullable;

/**
 * {@code ArtifactCoordinates} completed with information about how the artifact will be used.
 * This information includes the dependency type (main classes, test classes, <i>etc.</i>),
 * a scope (compile, runtime <i>etc.</i>), an obligation (whether the dependency
 * is optional or mandatory), and possible exclusions for transitive dependencies.

 * created for testing should have Integer node and String edge objects.
 *
 * <p>Test cases that should be handled similarly in any graph implementation are included in this
 * class. For example, testing that {@code nodes()} method returns the set of the nodes in the
 * graph. The following test cases are left for the subclasses to handle:
 *
 * <ul>
 *   <li>Test cases related to whether the graph is directed, undirected, mutable, or immutable.

            <phase>process-classes</phase>
            <goals>
              <goal>manifest</goal>
            </goals>
          </execution>
        </executions>
        <configuration>
          <instructions>
            <!-- Silence a warning that claims that META-INF/versions/9/... is the "wrong directory" for our classes. -->
            <_fixupmessages>^Classes found in the wrong directory: .*</_fixupmessages>

    }

    @Test
    void testGetLocation() {
        File txtFile = new File("target/test-classes/source.txt");
        FileSource source = new FileSource(txtFile);
        assertEquals(txtFile.getAbsolutePath(), source.getLocation());
    }

    @Test
    void testGetFile() {
        File txtFile = new File("target/test-classes/source.txt");
        FileSource source = new FileSource(txtFile);

import org.apache.maven.api.di.Named;

/**
 * Annotation processor that generates an index file for classes annotated with {@link Named}.
 * This processor scans for classes with the {@code @Named} annotation and creates a file
 * at {@code META-INF/maven/org.apache.maven.api.di.Inject} containing the fully qualified
 * names of these classes.
 *
 * @since 4.0.0
 */
@SupportedAnnotationTypes("org.apache.maven.api.di.Named")