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/**
* Copyright (C) 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.utils;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static sevenUnits.utils.UncertainDouble.fromRoundedString;
import static sevenUnits.utils.UncertainDouble.fromString;
import static sevenUnits.utils.UncertainDouble.of;
import java.util.List;
import org.junit.jupiter.api.Test;
/**
* Tests for the UncertainDouble
*
* @author Adrien Hopkins
* @since 2021-11-29
*/
class UncertainDoubleTest {
/**
* Ensures that the compareTo function behaves correctly.
*/
@Test
final void testCompareTo() {
assertTrue(of(2.0, 0.5).compareTo(of(2.0, 0.1)) == 0);
assertTrue(of(2.0, 0.5).compareTo(of(1.0, 0.1)) > 0);
assertTrue(of(2.0, 0.5).compareTo(of(3.0, 0.1)) < 0);
}
/**
* Tests the ___exact operations
*/
@Test
final void testExactOperations() {
final UncertainDouble x = UncertainDouble.of(Math.PI, 0.1);
// slightly different because roundoff errors
final UncertainDouble x1 = UncertainDouble.of(Math.PI + Math.E - Math.E,
0.1);
final UncertainDouble x2 = UncertainDouble.of(Math.PI * Math.E / Math.E,
0.1);
// get results
final UncertainDouble result1 = x.plusExact(Math.E).minusExact(Math.E);
final UncertainDouble result2 = x.timesExact(Math.E)
.dividedByExact(Math.E);
// test that these operations work & don't change uncertainty
assertEquals(x1, result1);
assertTrue(x.equivalent(result1));
assertEquals(x2, result2);
assertTrue(x.equivalent(result2));
// exponents are different
assertEquals(Math.pow(Math.PI, Math.E),
x.toExponentExact(Math.E).value());
}
/**
* Test for {@link UncertainDouble#fromRoundedString}
*
* @since 2022-04-18
*/
@Test
final void testFromRoundedString() {
assertEquals(of(12345.678, 0.001), fromRoundedString("12345.678"));
}
/**
* Test for {@link UncertainDouble#fromString}
*/
@Test
final void testFromString() {
// valid strings
assertEquals(of(2.0, 0.5), fromString("2.0 ± 0.5"));
assertEquals(of(2.0, 0.5), fromString("2.0 +- 0.5"));
assertEquals(of(2.0, 0.0), fromString("2.0"));
// invalid strings
for (final String s : List.of("2.A", "A", "2.0 ± ", " ± 3.5")) {
assertThrows(IllegalArgumentException.class, () -> fromString(s));
}
// back and forth
assertEquals("2.0 ± 0.5", of(2.0, 0.5).toString());
assertEquals("2.0", of(2.0, 0).toString());
}
@Test
final void testHashCode() {
assertEquals(of(2.0, 0.5).hashCode(), fromString("2.0 ± 0.5").hashCode());
}
}
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