content: /*
   * Copyright 2024-2026 the original author or authors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.alibaba.cloud.ai.graph.node;
  
  import com.alibaba.cloud.ai.graph.OverAllState;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Optional;
  
  import org.junit.jupiter.api.Test;
  
  public class OverAllStateNullValueTest {
  
  	@Test
  	void testOverAllStateWithNullValues() {
  		Map<String, Object> variables = new HashMap<>();
  		variables.put("nullVar", null);
  		variables.put("validVar", "valid");
  
  		OverAllState state = new OverAllState(variables);
  
  		Optional<Object> nullVarOpt = state.value("nullVar");
  		Optional<Object> validVarOpt = state.value("validVar");
  		Optional<Object> missingVarOpt = state.value("missingVar");
  
  		System.out.println("nullVar present: " + nullVarOpt.isPresent());
  		System.out.println("nullVar value: " + nullVarOpt.orElse("NOT_PRESENT"));
  
  		System.out.println("validVar present: " + validVarOpt.isPresent());
  		System.out.println("validVar value: " + validVarOpt.orElse("NOT_PRESENT"));
  
  		System.out.println("missingVar present: " + missingVarOpt.isPresent());
  		System.out.println("missingVar value: " + missingVarOpt.orElse("NOT_PRESENT"));
  	}
  
  }
  