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/**
* Copyright (C) 2018, 2021, 2022, 2024, 2025 Adrien Hopkins
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package sevenUnits.unit;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.util.Random;
import java.util.concurrent.ThreadLocalRandom;
import org.junit.jupiter.api.Test;
import sevenUnits.utils.DecimalComparison;
import sevenUnits.utils.NameSymbol;
/**
* Testing the various Unit classes. This is NOT part of this program's public
* API.
*
* @author Adrien Hopkins
* @since 2018-12-22
* @since v0.1.0
*/
class UnitTest {
/** A random number generator */
private static final Random rng = ThreadLocalRandom.current();
@Test
public void testAdditionAndSubtraction() {
final var inch = Metric.METRE.times(0.0254)
.withName(NameSymbol.of("inch", "in"));
final var foot = Metric.METRE.times(0.3048)
.withName(NameSymbol.of("foot", "ft"));
assertTrue(
inch.plus(foot).equalsApproximately(Metric.METRE.times(0.3302)),
String.format("Expected: %s, Actual: %s", inch.plus(foot),
Metric.METRE.times(0.3302)));
assertTrue(
foot.minus(inch).equalsApproximately(Metric.METRE.times(0.2794)),
String.format("Expected: %s, Actual: %s", foot.minus(inch),
Metric.METRE.times(0.2794)));
// test with LinearUnitValue
final var value1 = LinearUnitValue.getExact(Metric.METRE, 15);
final var value2 = LinearUnitValue.getExact(foot, 120);
final var value3 = LinearUnitValue.getExact(Metric.METRE, 0.5);
final var value4 = LinearUnitValue.getExact(Metric.KILOGRAM, 60);
// make sure addition is done correctly
assertEquals(51.576, value1.plus(value2).getValueExact(), 0.001);
assertEquals(15.5, value1.plus(value3).getValueExact());
assertEquals(52.076, value1.plus(value2).plus(value3).getValueExact(),
0.001);
// make sure addition uses the correct unit, and is still associative
// (ignoring floating-point rounding errors)
assertEquals(Metric.METRE, value1.plus(value2).getUnit());
assertEquals(Metric.METRE, value1.plus(value2).plus(value3).getUnit());
assertEquals(foot, value2.plus(value1).getUnit());
assertTrue(value1.plus(value2).equals(value2.plus(value1), true));
// make sure errors happen when they should
assertThrows(IllegalArgumentException.class, () -> value1.plus(value4));
assertThrows(IllegalArgumentException.class, () -> value1.minus(value4));
}
@Test
public void testConversion() {
final var metre = Metric.METRE;
final Unit inch = metre.times(0.0254);
final var value = UnitValue.of(inch, 75);
assertEquals(1.9, inch.convertTo(metre, 75), 0.01);
assertEquals(1.9, value.convertTo(metre).getValue(), 0.01);
// try random stuff
for (var i = 0; i < 1000; i++) {
// initiate random values
final var conversionFactor = UnitTest.rng.nextDouble() * 1000000;
final var testValue = UnitTest.rng.nextDouble() * 1000000;
final var expected = testValue * conversionFactor;
// test
final Unit unit = Metric.METRE.times(conversionFactor);
final var actual = unit.convertToBase(testValue);
assertEquals(actual, expected,
expected * DecimalComparison.DOUBLE_EPSILON);
}
}
@Test
public void testEquals() {
final var metre = Metric.METRE;
final Unit meter = Metric.BaseUnits.METRE.asLinearUnit();
assertEquals(metre, meter);
}
@Test
public void testIsMetric() {
final Unit metre = Metric.METRE;
final Unit megasecond = Metric.SECOND.withPrefix(Metric.MEGA);
final Unit hour = Metric.HOUR;
assertTrue(metre.isMetric());
assertTrue(megasecond.isMetric());
assertFalse(hour.isMetric());
}
@Test
public void testMultiplicationAndDivision() {
// test unit-times-unit multiplication
final var generatedJoule = Metric.KILOGRAM
.times(Metric.METRE.toExponent(2))
.dividedBy(Metric.SECOND.toExponent(2));
final var actualJoule = Metric.JOULE;
assertEquals(generatedJoule, actualJoule);
// test multiplication by conversion factors
final var kilometre = Metric.METRE.times(1000);
final var hour = Metric.SECOND.times(3600);
final var generatedKPH = kilometre.dividedBy(hour);
final var actualKPH = Metric.METRE.dividedBy(Metric.SECOND)
.dividedBy(3.6);
assertEquals(generatedKPH, actualKPH);
}
@Test
public void testPrefixes() {
final var generatedKilometre = Metric.METRE.withPrefix(Metric.KILO);
final var actualKilometre = Metric.METRE.times(1000);
assertEquals(generatedKilometre, actualKilometre);
}
}
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