code: /*
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * 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
   *
   * 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 limitations under the License.
   */
  
  package io.reactivex.rxjava3.internal.operators.flowable;
  
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.*;
  
  import java.util.*;
  
  import org.junit.*;
  import org.reactivestreams.Subscriber;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class FlowableToMultimapTest extends RxJavaTest {
      Subscriber<Object> objectSubscriber;
  
      SingleObserver<Object> singleObserver;
  
      @Before
      public void before() {
          objectSubscriber = TestHelper.mockSubscriber();
          singleObserver = TestHelper.mockSingleObserver();
      }
  
      Function<String, Integer> lengthFunc = new Function<String, Integer>() {
          @Override
          public Integer apply(String t1) {
              return t1.length();
          }
      };
      Function<String, String> duplicate = new Function<String, String>() {
          @Override
          public String apply(String t1) {
              return t1 + t1;
          }
      };
  
      @Test
      public void toMultimapFlowable() {
          Flowable<String> source = Flowable.just("a", "b", "cc", "dd");
  
          Flowable<Map<Integer, Collection<String>>> mapped = source.toMultimap(lengthFunc).toFlowable();
  
          Map<Integer, Collection<String>> expected = new HashMap<>();
          expected.put(1, Arrays.asList("a", "b"));
          expected.put(2, Arrays.asList("cc", "dd"));
  
          mapped.subscribe(objectSubscriber);
  
          verify(objectSubscriber, never()).onError(any(Throwable.class));
          verify(objectSubscriber, times(1)).onNext(expected);
          verify(objectSubscriber, times(1)).onComplete();
      }
  
      @Test
      public void toMultimapWithValueSelectorFlowable() {
          Flowable<String> source = Flowable.just("a", "b", "cc", "dd");
  
          Flowable<Map<Integer, Collection<String>>> mapped = source.toMultimap(lengthFunc, duplicate).toFlowable();
  
          Map<Integer, Collection<String>> expected = new HashMap<>();
          expected.put(1, Arrays.asList("aa", "bb"));
          expected.put(2, Arrays.asList("cccc", "dddd"));
  
          mapped.subscribe(objectSubscriber);
  
          verify(objectSubscriber, never()).onError(any(Throwable.class));
          verify(objectSubscriber, times(1)).onNext(expected);
          verify(objectSubscriber, times(1)).onComplete();
      }
  
      @Test
      public void toMultimapWithMapFactoryFlowable() {
          Flowable<String> source = Flowable.just("a", "b", "cc", "dd", "eee", "fff");
  
          Supplier<Map<Integer, Collection<String>>> mapFactory = new Supplier<Map<Integer, Collection<String>>>() {
              @Override
              public Map<Integer, Collection<String>> get() {
                  return new LinkedHashMap<Integer, Collection<String>>() {
  
                      private static final long serialVersionUID = -2084477070717362859L;
  
                      @Override
                      protected boolean removeEldestEntry(Map.Entry<Integer, Collection<String>> eldest) {
                          return size() > 2;
                      }
                  };
              }
          };
  
          Function<String, String> identity = new Function<String, String>() {
              @Override
              public String apply(String v) {
                  return v;
              }
          };
  
          Flowable<Map<Integer, Collection<String>>> mapped = source.toMultimap(
                  lengthFunc, identity,
                  mapFactory, new Function<Integer, Collection<String>>() {
                      @Override
                      public Collection<String> apply(Integer e) {
                          return new ArrayList<>();
                      }
                  }).toFlowable();
  
          Map<Integer, Collection<String>> expected = new HashMap<>();
          expected.put(2, Arrays.asList("cc", "dd"));
          expected.put(3, Arrays.asList("eee", "fff"));
  
          mapped.subscribe(objectSubscriber);
  
          verify(objectSubscriber, never()).onError(any(Throwable.class));
          verify(objectSubscriber, times(1)).onNext(expected);
          verify(objectSubscriber, times(1)).onComplete();
      }
  
      @Test
      public void toMultimapWithCollectionFactoryFlowable() {
          Flowable<String> source = Flowable.just("cc", "dd", "eee", "eee");
  
          Function<Integer, Collection<String>> collectionFactory = new Function<Integer, Collection<String>>() {
              @Override
              public Collection<String> apply(Integer t1) {
                  if (t1 == 2) {
                      return new ArrayList<>();
                  } else {
                      return new HashSet<>();
                  }
              }
          };
  
          Function<String, String> identity = new Function<String, String>() {
              @Override
              public String apply(String v) {
                  return v;
              }
          };
          Supplier<Map<Integer, Collection<String>>> mapSupplier = new Supplier<Map<Integer, Collection<String>>>() {
              @Override
              public Map<Integer, Collection<String>> get() {
                  return new HashMap<>();
              }
          };
  
          Flowable<Map<Integer, Collection<String>>> mapped = source
                  .toMultimap(lengthFunc, identity, mapSupplier, collectionFactory).toFlowable();
  
          Map<Integer, Collection<String>> expected = new HashMap<>();
          expected.put(2, Arrays.asList("cc", "dd"));
          expected.put(3, new HashSet<>(Arrays.asList("eee")));
  
          mapped.subscribe(objectSubscriber);
  
          verify(objectSubscriber, never()).onError(any(Throwable.class));
          verify(objectSubscriber, times(1)).onNext(expected);
          verify(objectSubscriber, times(1)).onComplete();
      }
  
      @Test
      public void toMultimapWithErrorFlowable() {
          Flowable<String> source = Flowable.just("a", "b", "cc", "dd");
  
          Function<String, Integer> lengthFuncErr = new Function<String, Integer>() {
              @Override
              public Integer apply(String t1) {
                  if ("b".equals(t1)) {
                      throw new RuntimeException("Forced Failure");
                  }
                  return t1.length();
              }
          };
  
          Flowable<Map<Integer, Collection<String>>> mapped = source.toMultimap(lengthFuncErr).toFlowable();
  
          Map<Integer, Collection<String>> expected = new HashMap<>();
          expected.put(1, Arrays.asList("a", "b"));
          expected.put(2, Arrays.asList("cc", "dd"));
  
          mapped.subscribe(objectSubscriber);
  
          verify(objectSubscriber, times(1)).onError(any(Throwable.class));
          verify(objectSubscriber, never()).onNext(expected);
          verify(objectSubscriber, never()).onComplete();
      }
  
      @Test
      public void toMultimapWithErrorInValueSelectorFlowable() {
          Flowable<String> source = Flowable.just("a", "b", "cc", "dd");
  
          Function<String, String> duplicateErr = new Function<String, String>() {
              @Override
              public String apply(String t1) {
                  if ("b".equals(t1)) {
                      throw new RuntimeException("Forced failure");
                  }
                  return t1 + t1;
              }
          };
  
          Flowable<Map<Integer, Collection<String>>> mapped = source.toMultimap(lengthFunc, duplicateErr).toFlowable();
  
          Map<Integer, Collection<String>> expected = new HashMap<>();
          expected.put(1, Arrays.asList("aa", "bb"));
          expected.put(2, Arrays.asList("cccc", "dddd"));
  
          mapped.subscribe(objectSubscriber);
  
          verify(objectSubscriber, times(1)).onError(any(Throwable.class));
          verify(objectSubscriber, never()).onNext(expected);
          verify(objectSubscriber, never()).onComplete();
      }
  
      @Test
      public void toMultimapWithMapThrowingFactoryFlowable() {
          Flowable<String> source = Flowable.just("a", "b", "cc", "dd", "eee", "fff");
  
          Supplier<Map<Integer, Collection<String>>> mapFactory = new Supplier<Map<Integer, Collection<String>>>() {
              @Override
              public Map<Integer, Collection<String>> get() {
                  throw new RuntimeException("Forced failure");
              }
          };
  
          Flowable<Map<Integer, Collection<String>>> mapped = source
                  .toMultimap(lengthFunc, new Function<String, String>() {
                      @Override
                      public String apply(String v) {
                          return v;
                      }
                  }, mapFactory).toFlowable();
  
          Map<Integer, Collection<String>> expected = new HashMap<>();
          expected.put(2, Arrays.asList("cc", "dd"));
          expected.put(3, Arrays.asList("eee", "fff"));
  
          mapped.subscribe(objectSubscriber);
  
          verify(objectSubscriber, times(1)).onError(any(Throwable.class));
          verify(objectSubscriber, never()).onNext(expected);
          verify(objectSubscriber, never()).onComplete();
      }
  
      @Test
      public void toMultimapWithThrowingCollectionFactoryFlowable() {
          Flowable<String> source = Flowable.just("cc", "cc", "eee", "eee");
  
          Function<Integer, Collection<String>> collectionFactory = new Function<Integer, Collection<String>>() {
              @Override
              public Collection<String> apply(Integer t1) {
                  if (t1 == 2) {
                      throw new RuntimeException("Forced failure");
                  } else {
                      return new HashSet<>();
                  }
              }
          };
  
          Function<String, String> identity = new Function<String, String>() {
              @Override
              public String apply(String v) {
                  return v;
              }
          };
          Supplier<Map<Integer, Collection<String>>> mapSupplier = new Supplier<Map<Integer, Collection<String>>>() {
              @Override
              public Map<Integer, Collection<String>> get() {
                  return new HashMap<>();
              }
          };
  
          Flowable<Map<Integer, Collection<String>>> mapped = source.toMultimap(lengthFunc,
                  identity, mapSupplier, collectionFactory).toFlowable();
  
          Map<Integer, Collection<String>> expected = new HashMap<>();
          expected.put(2, Arrays.asList("cc", "dd"));
          expected.put(3, Collections.singleton("eee"));
  
          mapped.subscribe(objectSubscriber);
  
          verify(objectSubscriber, times(1)).onError(any(Throwable.class));
          verify(objectSubscriber, never()).onNext(expected);
          verify(objectSubscriber, never()).onComplete();
      }
  
      @Test
      public void toMultimap() {
          Flowable<String> source = Flowable.just("a", "b", "cc", "dd");
  
          Single<Map<Integer, Collection<String>>> mapped = source.toMultimap(lengthFunc);
  
          Map<Integer, Collection<String>> expected = new HashMap<>();
          expected.put(1, Arrays.asList("a", "b"));
          expected.put(2, Arrays.asList("cc", "dd"));
  
          mapped.subscribe(singleObserver);
  
          verify(singleObserver, never()).onError(any(Throwable.class));
          verify(singleObserver, times(1)).onSuccess(expected);
      }
  
      @Test
      public void toMultimapWithValueSelector() {
          Flowable<String> source = Flowable.just("a", "b", "cc", "dd");
  
          Single<Map<Integer, Collection<String>>> mapped = source.toMultimap(lengthFunc, duplicate);
  
          Map<Integer, Collection<String>> expected = new HashMap<>();
          expected.put(1, Arrays.asList("aa", "bb"));
          expected.put(2, Arrays.asList("cccc", "dddd"));
  
          mapped.subscribe(singleObserver);
  
          verify(singleObserver, never()).onError(any(Throwable.class));
          verify(singleObserver, times(1)).onSuccess(expected);
      }
  
      @Test
      public void toMultimapWithMapFactory() {
          Flowable<String> source = Flowable.just("a", "b", "cc", "dd", "eee", "fff");
  
          Supplier<Map<Integer, Collection<String>>> mapFactory = new Supplier<Map<Integer, Collection<String>>>() {
              @Override
              public Map<Integer, Collection<String>> get() {
                  return new LinkedHashMap<Integer, Collection<String>>() {
  
                      private static final long serialVersionUID = -2084477070717362859L;
  
                      @Override
                      protected boolean removeEldestEntry(Map.Entry<Integer, Collection<String>> eldest) {
                          return size() > 2;
                      }
                  };
              }
          };
  
          Function<String, String> identity = new Function<String, String>() {
              @Override
              public String apply(String v) {
                  return v;
              }
          };
  
          Single<Map<Integer, Collection<String>>> mapped = source.toMultimap(
                  lengthFunc, identity,
                  mapFactory, new Function<Integer, Collection<String>>() {
                      @Override
                      public Collection<String> apply(Integer e) {
                          return new ArrayList<>();
                      }
                  });
  
          Map<Integer, Collection<String>> expected = new HashMap<>();
          expected.put(2, Arrays.asList("cc", "dd"));
          expected.put(3, Arrays.asList("eee", "fff"));
  
          mapped.subscribe(singleObserver);
  
          verify(singleObserver, never()).onError(any(Throwable.class));
          verify(singleObserver, times(1)).onSuccess(expected);
      }
  
      @Test
      public void toMultimapWithCollectionFactory() {
          Flowable<String> source = Flowable.just("cc", "dd", "eee", "eee");
  
          Function<Integer, Collection<String>> collectionFactory = new Function<Integer, Collection<String>>() {
              @Override
              public Collection<String> apply(Integer t1) {
                  if (t1 == 2) {
                      return new ArrayList<>();
                  } else {
                      return new HashSet<>();
                  }
              }
          };
  
          Function<String, String> identity = new Function<String, String>() {
              @Override
              public String apply(String v) {
                  return v;
              }
          };
          Supplier<Map<Integer, Collection<String>>> mapSupplier = new Supplier<Map<Integer, Collection<String>>>() {
              @Override
              public Map<Integer, Collection<String>> get() {
                  return new HashMap<>();
              }
          };
  
          Single<Map<Integer, Collection<String>>> mapped = source
                  .toMultimap(lengthFunc, identity, mapSupplier, collectionFactory);
  
          Map<Integer, Collection<String>> expected = new HashMap<>();
          expected.put(2, Arrays.asList("cc", "dd"));
          expected.put(3, new HashSet<>(Arrays.asList("eee")));
  
          mapped.subscribe(singleObserver);
  
          verify(singleObserver, never()).onError(any(Throwable.class));
          verify(singleObserver, times(1)).onSuccess(expected);
      }
  
      @Test
      public void toMultimapWithError() {
          Flowable<String> source = Flowable.just("a", "b", "cc", "dd");
  
          Function<String, Integer> lengthFuncErr = new Function<String, Integer>() {
              @Override
              public Integer apply(String t1) {
                  if ("b".equals(t1)) {
                      throw new RuntimeException("Forced Failure");
                  }
                  return t1.length();
              }
          };
  
          Single<Map<Integer, Collection<String>>> mapped = source.toMultimap(lengthFuncErr);
  
          Map<Integer, Collection<String>> expected = new HashMap<>();
          expected.put(1, Arrays.asList("a", "b"));
          expected.put(2, Arrays.asList("cc", "dd"));
  
          mapped.subscribe(singleObserver);
  
          verify(singleObserver, times(1)).onError(any(Throwable.class));
          verify(singleObserver, never()).onSuccess(expected);
      }
  
      @Test
      public void toMultimapWithErrorInValueSelector() {
          Flowable<String> source = Flowable.just("a", "b", "cc", "dd");
  
          Function<String, String> duplicateErr = new Function<String, String>() {
              @Override
              public String apply(String t1) {
                  if ("b".equals(t1)) {
                      throw new RuntimeException("Forced failure");
                  }
                  return t1 + t1;
              }
          };
  
          Single<Map<Integer, Collection<String>>> mapped = source.toMultimap(lengthFunc, duplicateErr);
  
          Map<Integer, Collection<String>> expected = new HashMap<>();
          expected.put(1, Arrays.asList("aa", "bb"));
          expected.put(2, Arrays.asList("cccc", "dddd"));
  
          mapped.subscribe(singleObserver);
  
          verify(singleObserver, times(1)).onError(any(Throwable.class));
          verify(singleObserver, never()).onSuccess(expected);
      }
  
      @Test
      public void toMultimapWithMapThrowingFactory() {
          Flowable<String> source = Flowable.just("a", "b", "cc", "dd", "eee", "fff");
  
          Supplier<Map<Integer, Collection<String>>> mapFactory = new Supplier<Map<Integer, Collection<String>>>() {
              @Override
              public Map<Integer, Collection<String>> get() {
                  throw new RuntimeException("Forced failure");
              }
          };
  
          Single<Map<Integer, Collection<String>>> mapped = source
                  .toMultimap(lengthFunc, new Function<String, String>() {
                      @Override
                      public String apply(String v) {
                          return v;
                      }
                  }, mapFactory);
  
          Map<Integer, Collection<String>> expected = new HashMap<>();
          expected.put(2, Arrays.asList("cc", "dd"));
          expected.put(3, Arrays.asList("eee", "fff"));
  
          mapped.subscribe(singleObserver);
  
          verify(singleObserver, times(1)).onError(any(Throwable.class));
          verify(singleObserver, never()).onSuccess(expected);
      }
  
      @Test
      public void toMultimapWithThrowingCollectionFactory() {
          Flowable<String> source = Flowable.just("cc", "cc", "eee", "eee");
  
          Function<Integer, Collection<String>> collectionFactory = new Function<Integer, Collection<String>>() {
              @Override
              public Collection<String> apply(Integer t1) {
                  if (t1 == 2) {
                      throw new RuntimeException("Forced failure");
                  } else {
                      return new HashSet<>();
                  }
              }
          };
  
          Function<String, String> identity = new Function<String, String>() {
              @Override
              public String apply(String v) {
                  return v;
              }
          };
          Supplier<Map<Integer, Collection<String>>> mapSupplier = new Supplier<Map<Integer, Collection<String>>>() {
              @Override
              public Map<Integer, Collection<String>> get() {
                  return new HashMap<>();
              }
          };
  
          Single<Map<Integer, Collection<String>>> mapped = source.toMultimap(lengthFunc,
                  identity, mapSupplier, collectionFactory);
  
          Map<Integer, Collection<String>> expected = new HashMap<>();
          expected.put(2, Arrays.asList("cc", "dd"));
          expected.put(3, Collections.singleton("eee"));
  
          mapped.subscribe(singleObserver);
  
          verify(singleObserver, times(1)).onError(any(Throwable.class));
          verify(singleObserver, never()).onSuccess(expected);
      }
  
  }
  