### Question:
ClassReferenceGraph { public boolean isReachable(String className) { return reachableClasses.contains(className); } private  ClassReferenceGraph(
      SymbolReferences symbolReferences,
      Set<String> entryPointClasses); boolean isReachable(String className);  }### Answer:
@Test public void testClassReachableClass() throws URISyntaxException, IOException { ClassReferenceGraph classReferenceGraph = createExampleGraph(); Truth.assertThat(classReferenceGraph.isReachable("ClassB")).isTrue(); }
@Test public void testUnreachableClass() throws URISyntaxException, IOException { ClassReferenceGraph classReferenceGraph = createExampleGraph(); Truth.assertThat(classReferenceGraph.isReachable("ClassC")).isFalse(); }