/* Copyright 2002-2022 CS GROUP
    * Licensed to CS GROUP (CS) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * CS 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
   * limitations under the License.
   */
  package org.orekit.propagation.events;
  
  import org.hamcrest.CoreMatchers;
  import org.hamcrest.MatcherAssert;
  import org.junit.Assert;
  import org.junit.Test;
  import org.mockito.Mockito;
  import org.orekit.propagation.SpacecraftState;
  import org.orekit.propagation.events.handlers.EventHandler;
  import org.orekit.time.AbsoluteDate;
  
  /**
   * Unit tests for {@link NegateDetector}.
   *
   * @author Evan Ward
   */
  public class NegateDetectorTest {
  
      /**
       * check {@link NegateDetector#init(SpacecraftState, AbsoluteDate)}.
       */
      @Test
      public void testInit() {
          //setup
          EventDetector a = Mockito.mock(EventDetector.class);
          @SuppressWarnings("unchecked")
          EventHandler<EventDetector> c = Mockito.mock(EventHandler.class);
          NegateDetector detector = new NegateDetector(a).withHandler(c);
          AbsoluteDate t = AbsoluteDate.GPS_EPOCH;
          SpacecraftState s = Mockito.mock(SpacecraftState.class);
          Mockito.when(s.getDate()).thenReturn(t.shiftedBy(60.0));
  
          //action
          detector.init(s, t);
  
          //verify
          Mockito.verify(a).init(s, t);
          Mockito.verify(c).init(s, t, detector);
      }
  
      /**
       * check g function is negated.
       */
      @Test
      public void testG() {
          //setup
          EventDetector a = Mockito.mock(EventDetector.class);
          NegateDetector detector = new NegateDetector(a);
          SpacecraftState s = Mockito.mock(SpacecraftState.class);
  
          // verify + to -
          Mockito.when(a.g(s)).thenReturn(1.0);
          MatcherAssert.assertThat(detector.g(s), CoreMatchers.is(-1.0));
          // verify - to +
          Mockito.when(a.g(s)).thenReturn(-1.0);
          MatcherAssert.assertThat(detector.g(s), CoreMatchers.is(1.0));
      }
  
      /** Check a with___ method. */
      @Test
      public void testCreate() {
          //setup
          EventDetector a = Mockito.mock(EventDetector.class);
          NegateDetector detector = new NegateDetector(a);
  
          // action
          NegateDetector actual = detector.withMaxCheck(100);
  
          //verify
          MatcherAssert.assertThat(actual.getMaxCheckInterval(), CoreMatchers.is(100.0));
          Assert.assertTrue(actual.getOriginal() == a);
      }
  }