/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF 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.apache.commons.numbers.angle;
  
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests for examples contained in the user guide.
   */
  class UserGuideTest {
  
      @Test
      void testAngle1() {
          Angle.Deg a = Angle.Turn.of(0.5).toDeg();
          Angle.Rad b = a.toRad();
          Angle.Turn c = b.toTurn();
          Assertions.assertEquals(0.5, c.getAsDouble());
      }
  
      @Test
      void testAngleNormalizer1() {
          double angle = Angle.Deg.normalizer(-180).applyAsDouble(270);
          Assertions.assertEquals(-90.0, angle);
      }
  
      @Test
      void testReduce1() {
          Reduce reduce = new Reduce(0, 24);
          double hours1 = reduce.applyAsDouble(173.5);
          double hours2 = reduce.applyAsDouble(23.5);
          double hours3 = reduce.applyAsDouble(-10);
          Assertions.assertEquals(5.5, hours1);
          Assertions.assertEquals(23.5, hours2);
          Assertions.assertEquals(14.0, hours3);
      }
  
      @Test
      void testCosAngle1() {
          double[] v1 = {1, 0};
          double[] v2 = {0, 1};
          double[] v3 = {7, 7};
          double cosAngle1 = CosAngle.value(v1, v1);
          double cosAngle2 = CosAngle.value(v1, v2);
          double cosAngle3 = CosAngle.value(v1, v3);
          Assertions.assertEquals(1, cosAngle1);
          Assertions.assertEquals(0, cosAngle2);
          Assertions.assertEquals(0.7071067811865476, cosAngle3);
          Assertions.assertEquals(45.0, Math.toDegrees(Math.acos(cosAngle3)));
      }
  }