### Question:
TypeDeclaration { public boolean isUnknownType() { return type.getKind() == TypeKind.NONE; } protected  TypeDeclaration(
      Context ctx,
      TypeMirror type,
      CtType ctType,
      TypeElement typeElement,
      Map<Name, List<TypeParameterDeclaration>> typeParameterDeclarationsMap); TypeMirror getType(); String getBinaryName(); boolean isUnknownType(); boolean isNullType(); boolean isBooleanType(); boolean isTextType(); boolean isNumberType(); boolean is(Class<?> clazz); boolean isScalarType(); boolean isScalarIterableType(); boolean isScalarArrayType(); List<TypeParameterDeclaration> getTypeParameterDeclarations(); Optional<ConstructorDeclaration> getConstructorDeclaration(
      List<TypeDeclaration> parameterTypeDeclarations); Optional<FieldDeclaration> getFieldDeclaration(String name); Optional<FieldDeclaration> getStaticFieldDeclaration(String name); Optional<MethodDeclaration> getMethodDeclaration(
      String name, List<TypeDeclaration> parameterTypeDeclarations); Optional<MethodDeclaration> getStaticMethodDeclaration(
      String name, List<TypeDeclaration> parameterTypeDeclarations); TypeDeclaration emulateConcatOperation(TypeDeclaration other); TypeDeclaration emulateArithmeticOperation(TypeDeclaration other); boolean isSameType(TypeDeclaration other); @Override String toString();  }### Answer:
@Test void isUnknownType() { addProcessor( new TestProcessor() { @Override protected void run() { TypeDeclaration typeDeclaration = ctx.getDeclarations().newTypeDeclaration(String.class); assertFalse(typeDeclaration.isUnknownType()); } }, new TestProcessor() { @Override protected void run() { TypeDeclaration typeDeclaration = ctx.getDeclarations().newUnknownTypeDeclaration(); assertTrue(typeDeclaration.isUnknownType()); } }); }