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   1 /**
   2  * Copyright (c) 2010-2023 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.mielecloud.internal.webservice.language;
  14
  15 import static org.junit.jupiter.api.Assertions.*;
  16
  17 import java.util.Optional;
  18
  19 import org.eclipse.jdt.annotation.NonNullByDefault;
  20 import org.junit.jupiter.api.Test;
  21
  22 /**
  23  * @author Björn Lange - Initial contribution
  24  */
  25 @NonNullByDefault
  26 public class CombiningLanguageProviderTest {
  27     private static final Optional<String> PRIORITIZED_LANGUAGE = Optional.of("de");
  28     private static final Optional<String> FALLBACK_LANGUAGE = Optional.of("en");
  29
  30     private static final LanguageProvider PRIORITIZED_PROVIDER = new LanguageProvider() {
  31         @Override
  32         public Optional<String> getLanguage() {
  33             return PRIORITIZED_LANGUAGE;
  34         }
  35     };
  36
  37     private static final LanguageProvider FALLBACK_PROVIDER = new LanguageProvider() {
  38         @Override
  39         public Optional<String> getLanguage() {
  40             return FALLBACK_LANGUAGE;
  41         }
  42     };
  43
  44     private static final LanguageProvider NULL_PROVIDER = new LanguageProvider() {
  45         @Override
  46         public Optional<String> getLanguage() {
  47             return Optional.empty();
  48         }
  49     };
  50
  51     @Test
  52     public void testPrioritizedLanguageProviderIsUsed() {
  53         // given:
  54         LanguageProvider provider = new CombiningLanguageProvider(PRIORITIZED_PROVIDER, FALLBACK_PROVIDER);
  55
  56         // when:
  57         Optional<String> language = provider.getLanguage();
  58
  59         // then:
  60         assertEquals(PRIORITIZED_LANGUAGE, language);
  61     }
  62
  63     @Test
  64     public void testFallbackProviderIsUsedWhenPrioritizedProviderIsNull() {
  65         // given:
  66         LanguageProvider provider = new CombiningLanguageProvider(null, FALLBACK_PROVIDER);
  67
  68         // when:
  69         Optional<String> language = provider.getLanguage();
  70
  71         // then:
  72         assertEquals(FALLBACK_LANGUAGE, language);
  73     }
  74
  75     @Test
  76     public void testFallbackProviderIsUsedWhenPrioritizedProviderProvidesNull() {
  77         // given:
  78         LanguageProvider provider = new CombiningLanguageProvider(NULL_PROVIDER, FALLBACK_PROVIDER);
  79
  80         // when:
  81         Optional<String> language = provider.getLanguage();
  82
  83         // then:
  84         assertEquals(FALLBACK_LANGUAGE, language);
  85     }
  86
  87     @Test
  88     public void testProvidesNullWhenBothProvidersAreNull() {
  89         // given:
  90         LanguageProvider provider = new CombiningLanguageProvider(null, null);
  91
  92         // when:
  93         Optional<String> language = provider.getLanguage();
  94
  95         // then:
  96         assertFalse(language.isPresent());
  97     }
  98 }