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Merge pull request #4 from hangga/time-field 

simplify unit tests
This commit is contained in:
Hangga Aji Sayekti 2023-11-18 14:22:52 +07:00 committed by GitHub
parent b7bc968da2 213fb362a0
commit 10b8f0370c
1 changed files with 13 additions and 33 deletions
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46
core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/UUIDPositiveLongGeneratorUnitTest.java
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@ -1,52 +1,32 @@
package com.baeldung.uuid;
import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.Method;
import java.text.DecimalFormat;
import java.util.HashSet;
import java.util.Set;
import static org.assertj.core.api.Assertions.assertThat;
public class UUIDPositiveLongGeneratorUnitTest {
private final static int NUMBER_OF_CHECKS = 1000000;
private final static double COLLISION_THRESHOLD = 0.001;
private final UUIDPositiveLongGenerator uuidLongGenerator = new UUIDPositiveLongGenerator();
private final Logger logger = LoggerFactory.getLogger(UUIDPositiveLongGeneratorUnitTest.class);
//private final UUIDPositiveLongGenerator uuidLongGenerator = new UUIDPositiveLongGenerator();
Set<Long> uniqueValues = new HashSet<>();
@Test
void whenForeachGenerateLongValue_thenCollisionsCheck() throws Exception {
printTableHeader();
UUIDPositiveLongGenerator uuidLongGenerator = new UUIDPositiveLongGenerator();
for (Method method : uuidLongGenerator.getClass().getDeclaredMethods()) {
collisionCheck(method);
}
}
private void printTableHeader() {
logger.info(String.format("%-30s %-15s %-15s", "Approach(method name)", "collisions", "probability"));
logger.info("-----------------------------------------------------------------------");
}
private void printOutput(String method, int collisionsCount, double collisionsProbability) {
DecimalFormat decimalFormat = new DecimalFormat("#.#####");
logger.info(String.format("%-30s %-15s %-15s", method, collisionsCount, decimalFormat.format(collisionsProbability)));
}
private void collisionCheck(Method method) throws Exception {
Set<Long> uniqueValues = new HashSet<>();
int collisions = 0;
for (int i = 0; i < NUMBER_OF_CHECKS; i++) {
long uniqueValue = (long) method.invoke(uuidLongGenerator);
long uniqueValue;
do uniqueValue = (long) method.invoke(uuidLongGenerator); while (!isUnique(uniqueValue));
assertThat(uniqueValue).isPositive();
if (!uniqueValues.add(uniqueValue)) {
collisions++;
}
}
double collisionsProbability = (double) collisions / NUMBER_OF_CHECKS;
printOutput(method.getName(), collisions, collisionsProbability);
assertThat(collisionsProbability).isLessThan(COLLISION_THRESHOLD);
}
private boolean isUnique(long value) {
// Implement uniqueness checking logic, for example, by checking in the database
return uniqueValues.add(value);
}
}