code: /*
   * Copyright (c) 2019 the Eclipse Milo Authors
   *
   * This program and the accompanying materials are made
   * available under the terms of the Eclipse Public License 2.0
   * which is available at https://www.eclipse.org/legal/epl-2.0/
   *
   * SPDX-License-Identifier: EPL-2.0
   */
  
  package org.eclipse.milo.opcua.stack.core.serialization.binary;
  
  import org.eclipse.milo.opcua.stack.core.Identifiers;
  import org.eclipse.milo.opcua.stack.core.NamespaceTable;
  import org.eclipse.milo.opcua.stack.core.serialization.TestSerializationContext;
  import org.eclipse.milo.opcua.stack.core.serialization.codecs.OpcUaBinaryDataTypeCodec;
  import org.eclipse.milo.opcua.stack.core.types.OpcUaDataTypeManager;
  import org.eclipse.milo.opcua.stack.core.types.OpcUaDefaultBinaryEncoding;
  import org.eclipse.milo.opcua.stack.core.types.builtin.LocalizedText;
  import org.eclipse.milo.opcua.stack.core.types.enumerated.ApplicationType;
  import org.eclipse.milo.opcua.stack.core.types.structured.Argument;
  import org.testng.annotations.Test;
  
  import static org.testng.Assert.assertEquals;
  import static org.testng.Assert.assertNotNull;
  import static org.testng.Assert.assertNull;
  
  public class BinaryDecoderTest extends BinarySerializationFixture {
  
      @Test(description = "a null array, once encoded, should decode to a null array")
      public void testDecodeNullArray() {
          Argument argument = new Argument(
              "test",
              Identifiers.Int16,
              1,
              null,
              LocalizedText.NULL_VALUE
          );
  
          @SuppressWarnings("unchecked")
          OpcUaBinaryDataTypeCodec<Argument> codec = (OpcUaBinaryDataTypeCodec<Argument>)
              OpcUaDataTypeManager.getInstance().getCodec(
                  OpcUaDefaultBinaryEncoding.ENCODING_NAME,
                  Argument.TYPE_ID.toNodeId(new NamespaceTable()).get()
              );
  
          assertNotNull(codec);
  
          codec.encode(new TestSerializationContext(), writer, argument);
          Argument decoded = codec.decode(new TestSerializationContext(), reader);
  
          assertEquals(decoded.getName(), argument.getName());
  
          assertNull(decoded.getArrayDimensions());
      }
  
      @Test
      public void testEnumScalar() {
          writer.writeEnum(null, ApplicationType.Client);
          ApplicationType decoded = reader.readEnum(null, ApplicationType.class);
  
          assertEquals(decoded, ApplicationType.Client);
      }
  
      @Test
      public void testEnumArray() {
          ApplicationType[] array = new ApplicationType[]{
              ApplicationType.Client,
              ApplicationType.ClientAndServer
          };
          writer.writeEnumArray(null, array);
          ApplicationType[] decoded = (ApplicationType[]) reader.readEnumArray(null, ApplicationType.class);
  
          assertEquals(decoded, array);
      }
  
  }
  