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.junit.Assert.*;
  
  import java.util.concurrent.TimeUnit;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.MissingBackpressureException;
  import io.reactivex.rxjava3.schedulers.Schedulers;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class FlowableIntervalRangeTest extends RxJavaTest {
      @Test
      public void simple() throws Exception {
          Flowable.intervalRange(5, 5, 50, 50, TimeUnit.MILLISECONDS)
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(5L, 6L, 7L, 8L, 9L);
      }
  
      @Test
      public void customScheduler() {
          Flowable.intervalRange(1, 5, 1, 1, TimeUnit.MILLISECONDS, Schedulers.single())
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1L, 2L, 3L, 4L, 5L);
      }
  
      @Test
      public void countZero() {
          Flowable.intervalRange(1, 0, 1, 1, TimeUnit.MILLISECONDS)
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult();
      }
  
      @Test
      public void countNegative() {
          try {
              Flowable.intervalRange(1, -1, 1, 1, TimeUnit.MILLISECONDS);
              fail("Should have thrown!");
          } catch (IllegalArgumentException ex) {
              assertEquals("count >= 0 required but it was -1", ex.getMessage());
          }
      }
  
      @Test
      public void longOverflow() {
          Flowable.intervalRange(Long.MAX_VALUE - 1, 2, 1, 1, TimeUnit.MILLISECONDS);
  
          Flowable.intervalRange(Long.MIN_VALUE, Long.MAX_VALUE, 1, 1, TimeUnit.MILLISECONDS);
  
          try {
              Flowable.intervalRange(Long.MAX_VALUE - 1, 3, 1, 1, TimeUnit.MILLISECONDS);
              fail("Should have thrown!");
          } catch (IllegalArgumentException ex) {
              assertEquals("Overflow! start + count is bigger than Long.MAX_VALUE", ex.getMessage());
          }
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(Flowable.intervalRange(1, 2, 1, 1, TimeUnit.MILLISECONDS));
      }
  
      @Test
      public void backpressureBounded() {
          Flowable.intervalRange(1, 2, 1, 1, TimeUnit.MILLISECONDS)
          .test(2L)
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1L, 2L);
      }
  
      @Test
      public void backpressureOverflow() {
          Flowable.intervalRange(1, 3, 1, 1, TimeUnit.MILLISECONDS)
          .test(2L)
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(MissingBackpressureException.class, 1L, 2L);
      }
  
      @Test
      public void badRequest() {
          TestHelper.assertBadRequestReported(Flowable.intervalRange(1, 3, 1, 1, TimeUnit.MILLISECONDS));
      }
  
      @Test
      public void take() {
          Flowable.intervalRange(1, 2, 1, 1, TimeUnit.MILLISECONDS)
          .take(1)
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1L);
      }
  
      @Test
      public void cancel() {
          Flowable.intervalRange(0, 20, 1, 1, TimeUnit.MILLISECONDS, Schedulers.trampoline())
          .take(10)
          .test()
          .assertResult(0L, 1L, 2L, 3L, 4L, 5L, 6L, 7L, 8L, 9L);
      }
  
      @Test
      public void takeSameAsRange() {
          Flowable.intervalRange(0, 2, 1, 1, TimeUnit.MILLISECONDS, Schedulers.trampoline())
          .take(2)
          .test()
          .assertResult(0L, 1L);
      }
  }
  