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Merge pull request #10265 from maciejglowka/BAEL-4725 

BAEL-4725: examples of double comparison in Java
This commit is contained in:
davidmartinezbarua 2020-12-06 12:46:53 -03:00 committed by GitHub
parent 2acd01e551 6743c4de49
commit de36111f42
2 changed files with 83 additions and 0 deletions
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12
core-java-modules/core-java-lang-3/pom.xml
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@ -23,6 +23,18 @@
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>${guava.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-math3</artifactId>
<version>3.6.1</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>

71
core-java-modules/core-java-lang-3/src/test/java/com/baeldung/comparedouble/CompareDoubleUnitTest.java Normal file
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@ -0,0 +1,71 @@
package com.baeldung.comparedouble;
import com.google.common.math.DoubleMath;
import org.apache.commons.math3.util.Precision;
import org.junit.Test;
import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.Assert.assertEquals;
public class CompareDoubleUnitTest {
@Test
public void givenDoubleValuesThatShouldHaveSameValue_whenUsingSimpleComparison_thenFails() {
double d1 = getFirstDouble(0);
double d2 = .1 * 8;
assertThat(d1 == d2).isFalse();
}
@Test
public void givenDoubleValuesThatShouldHaveSameValue_whenUsingThresholdComparison_thenSuccess() {
double d1 = getFirstDouble(0);
double d2 = .1 * 8;
double epsilon = 0.000001d;
assertThat(Math.abs(d1 - d2) < epsilon).isTrue();
}
@Test
public void givenDoubleValuesThatShouldHaveSameValue_whenUsingGuavaFuzzyComparison_thenSuccess() {
double d1 = getFirstDouble(0);
double d2 = .1 * 8;
double epsilon = 0.000001d;
assertThat(DoubleMath.fuzzyEquals(d1, d2, epsilon)).isTrue();
}
@Test
public void givenDoubleValuesThatShouldHaveSameValue_whenUsingCommonsMathComparison_thenSuccess() {
double d1 = getFirstDouble(0);
double d2 = .1 * 8;
double epsilon = 0.000001d;
assertThat(Precision.equals(d1, d2, epsilon)).isTrue();
assertThat(Precision.equals(d1, d2)).isTrue();
}
@Test
public void givenDoubleValuesThatShouldHaveSameValue_whenUsingJunitComparison_thenSuccess() {
double d1 = getFirstDouble(0);
double d2 = .1 * 8;
double epsilon = 0.000001d;
assertEquals(d1, d2, epsilon);
}
private double getFirstDouble(double d1) {
for (int i = 1; i <= 8; i++) {
d1 += .1;
}
return d1;
}
}