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   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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
   *
   *     http://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
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  package org.apache.beam.sdk.options;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNull;
  
  import com.fasterxml.jackson.databind.ObjectMapper;
  import org.apache.beam.sdk.util.common.ReflectHelpers;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link ValueProviders}. */
  @RunWith(JUnit4.class)
  public class ValueProvidersTest {
    private static final ObjectMapper MAPPER =
        new ObjectMapper()
            .registerModules(ObjectMapper.findModules(ReflectHelpers.findClassLoader()));
  
    /** A test interface. */
    public interface TestOptions extends PipelineOptions {
      String getString();
  
      void setString(String value);
  
      String getOtherString();
  
      void setOtherString(String value);
    }
  
    @Test
    public void testUpdateSerialize() throws Exception {
      TestOptions submitOptions = PipelineOptionsFactory.as(TestOptions.class);
      String serializedOptions = MAPPER.writeValueAsString(submitOptions);
      String updatedOptions =
          ValueProviders.updateSerializedOptions(serializedOptions, ImmutableMap.of("string", "bar"));
      TestOptions runtime =
          MAPPER.readValue(updatedOptions, PipelineOptions.class).as(TestOptions.class);
      assertEquals("bar", runtime.getString());
    }
  
    @Test
    public void testUpdateSerializeExistingValue() throws Exception {
      TestOptions submitOptions =
          PipelineOptionsFactory.fromArgs("--string=baz", "--otherString=quux").as(TestOptions.class);
      String serializedOptions = MAPPER.writeValueAsString(submitOptions);
      String updatedOptions =
          ValueProviders.updateSerializedOptions(serializedOptions, ImmutableMap.of("string", "bar"));
      TestOptions runtime =
          MAPPER.readValue(updatedOptions, PipelineOptions.class).as(TestOptions.class);
      assertEquals("bar", runtime.getString());
      assertEquals("quux", runtime.getOtherString());
    }
  
    @Test
    public void testUpdateSerializeEmptyUpdate() throws Exception {
      TestOptions submitOptions = PipelineOptionsFactory.as(TestOptions.class);
      String serializedOptions = MAPPER.writeValueAsString(submitOptions);
      String updatedOptions =
          ValueProviders.updateSerializedOptions(serializedOptions, ImmutableMap.of());
      TestOptions runtime =
          MAPPER.readValue(updatedOptions, PipelineOptions.class).as(TestOptions.class);
      assertNull(runtime.getString());
    }
  }
  