72 lines
3.5 KiB
Java
72 lines
3.5 KiB
Java
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package com.baeldung.maths;
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import org.apache.commons.math3.util.Precision;
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import org.decimal4j.util.DoubleRounder;
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import org.junit.Assert;
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import org.junit.Test;
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public class RoundUnitTest {
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private double value = 2.03456d;
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private int places = 2;
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private double delta = 0.0d;
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private double expected = 2.03d;
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@Test
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public void givenDecimalNumber_whenRoundToNDecimalPlaces_thenGetExpectedResult() {
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Assert.assertEquals(expected, Round.round(value, places), delta);
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Assert.assertEquals(expected, Round.roundNotPrecise(value, places), delta);
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Assert.assertEquals(expected, Round.roundAvoid(value, places), delta);
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Assert.assertEquals(expected, Precision.round(value, places), delta);
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Assert.assertEquals(expected, DoubleRounder.round(value, places), delta);
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places = 3;
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expected = 2.035d;
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Assert.assertEquals(expected, Round.round(value, places), delta);
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Assert.assertEquals(expected, Round.roundNotPrecise(value, places), delta);
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Assert.assertEquals(expected, Round.roundAvoid(value, places), delta);
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Assert.assertEquals(expected, Precision.round(value, places), delta);
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Assert.assertEquals(expected, DoubleRounder.round(value, places), delta);
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value = 1000.0d;
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places = 17;
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expected = 1000.0d;
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Assert.assertEquals(expected, Round.round(value, places), delta);
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Assert.assertEquals(expected, Round.roundNotPrecise(value, places), delta);
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Assert.assertNotEquals(expected, Round.roundAvoid(value, places), delta); // Returns: 92.23372036854776 !
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Assert.assertEquals(expected, Precision.round(value, places), delta);
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Assert.assertEquals(expected, DoubleRounder.round(value, places), delta);
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value = 256.025d;
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places = 2;
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expected = 256.03d;
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Assert.assertEquals(expected, Round.round(value, places), delta);
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Assert.assertNotEquals(expected, Round.roundNotPrecise(value, places), delta); // Returns: 256.02 !
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Assert.assertNotEquals(expected, Round.roundAvoid(value, places), delta); // Returns: 256.02 !
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Assert.assertEquals(expected, Precision.round(value, places), delta);
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Assert.assertNotEquals(expected, DoubleRounder.round(value, places), delta); // Returns: 256.02 !
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value = 260.775d;
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places = 2;
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expected = 260.78d;
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Assert.assertEquals(expected, Round.round(value, places), delta);
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Assert.assertNotEquals(expected, Round.roundNotPrecise(value, places), delta); // Returns: 260.77 !
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Assert.assertNotEquals(expected, Round.roundAvoid(value, places), delta); // Returns: 260.77 !
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Assert.assertEquals(expected, Precision.round(value, places), delta);
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Assert.assertNotEquals(expected, DoubleRounder.round(value, places), delta); // Returns: 260.77 !
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value = 90080070060.1d;
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places = 9;
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expected = 90080070060.1d;
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Assert.assertEquals(expected, Round.round(value, places), delta);
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Assert.assertEquals(expected, Round.roundNotPrecise(value, places), delta);
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Assert.assertNotEquals(expected, Round.roundAvoid(value, places), delta); // Returns: 9.223372036854776E9 !
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Assert.assertEquals(expected, Precision.round(value, places), delta);
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Assert.assertEquals(expected, DoubleRounder.round(value, places), delta);
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}
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}
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