UnitConversionTest.java :  » Physics » dyn4j » org » dyn4j » game2d » Java Open Source

/*
 * Copyright (c) 2010 William Bittle  http://www.dyn4j.org/
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, are permitted 
 * provided that the following conditions are met:
 * 
 *   * Redistributions of source code must retain the above copyright notice, this list of conditions 
 *     and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright notice, this list of conditions 
 *     and the following disclaimer in the documentation and/or other materials provided with the 
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 *   * Neither the name of dyn4j nor the names of its contributors may be used to endorse or 
 *     promote products derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 
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 */
package org.dyn4j.game2d;

import org.junit.Test;

import junit.framework.TestCase;

/**
 * Test case for the {@link UnitConversion} class.
 * @author William Bittle
 * @version 1.0.3
 * @since 1.0.1
 */
public class UnitConversionTest {
  /**
   * Tests the foot to meter and meter to foot conversions.
   */
  @Test
  public void footMeter() {
    // test the static values
    TestCase.assertEquals(1.000, UnitConversion.FOOT_TO_METER * UnitConversion.METER_TO_FOOT);
    
    // test a normal value
    double m = 2.5;
    double f = UnitConversion.metersToFeet(m);
    double r = UnitConversion.feetToMeters(f);
    
    TestCase.assertEquals(m, r, 1.0e-9);
  }
  
  /**
   * Tests the slug to kilogram and kilogram to slug conversions.
   */
  @Test
  public void slugKilogram() {
    // test the static values
    TestCase.assertEquals(1.000, UnitConversion.SLUG_TO_KILOGRAM * UnitConversion.KILOGRAM_TO_SLUG);
    
    // test a normal value
    double s = 2.5;
    double k = UnitConversion.slugsToKilograms(s);
    double r = UnitConversion.kilogramsToSlugs(k);
    
    TestCase.assertEquals(s, r, 1.0e-9);
  }
  
  /**
   * Tests the pound to kilogram and kilogram to pound conversions.
   */
  @Test
  public void poundKilogram() {
    // test the static values
    TestCase.assertEquals(1.000, UnitConversion.POUND_TO_KILOGRAM * UnitConversion.KILOGRAM_TO_POUND);
    
    // test a normal value
    double p = 2.5;
    double k = UnitConversion.poundsToKilograms(p);
    double r = UnitConversion.kilogramsToPounds(k);
    
    TestCase.assertEquals(p, r, 1.0e-9);
  }
  
  /**
   * Tests the meters per second to feet per second (and reverse) conversions.
   */
  @Test
  public void mpsToFps() {
    // test a normal value
    double fps = 2.5;
    double mps = UnitConversion.metersPerSecondToFeetPerSecond(fps);
    double r   = UnitConversion.feetPerSecondToMetersPerSecond(mps);
    
    TestCase.assertEquals(fps, r, 1.0e-9);
  }
  
  /**
   * Tests the pound to newton and newton to pound conversions.
   */
  @Test
  public void poundNewton() {
    // test the static values
    TestCase.assertEquals(1.000, UnitConversion.POUND_TO_NEWTON * UnitConversion.NEWTON_TO_POUND);
    
    // test a normal value
    double p = 2.5;
    double n = UnitConversion.poundsToNewtons(p);
    double r = UnitConversion.newtonsToPounds(n);
    
    TestCase.assertEquals(p, r, 1.0e-9);
  }
  
  /**
   * Tests the foot-pound to newton-meter and newton-meter to foot-pound conversions.
   */
  @Test
  public void footPoundNewtonMeter() {
    // test the static values
    TestCase.assertEquals(1.000, UnitConversion.FOOT_POUND_TO_NEWTON_METER * UnitConversion.NEWTON_METER_TO_FOOT_POUND);
    
    // test a normal value
    double fp = 2.5;
    double nm = UnitConversion.footPoundsToNewtonMeters(fp);
    double r  = UnitConversion.newtonMetersToFootPounds(nm);
    
    TestCase.assertEquals(fp, r, 1.0e-9);
  }
}