diff --git a/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/UUIDLongGeneratorUnitTest.java b/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/UUIDLongGeneratorUnitTest.java
deleted file mode 100644
index fde726d259..0000000000
--- a/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/UUIDLongGeneratorUnitTest.java
+++ /dev/null
@@ -1,60 +0,0 @@
-package com.baeldung.uuid;
-
-import org.apache.log4j.Logger;
-import org.junit.jupiter.api.Test;
-
-import java.lang.reflect.InvocationTargetException;
-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 UUIDLongGeneratorUnitTest {
-    private final static int n = 1000000;
-    private final static double COLLISION_THRESHOLD = 0.001;
-    private static final Logger logger = Logger.getLogger(UUIDLongGeneratorUnitTest.class);
-    private final UUIDPositiveLongGenerator uuidLongGenerator = new UUIDPositiveLongGenerator();
-
-    @Test
-    void whenForeachGenerateLongValue_thenCollisionsCheck() throws InvocationTargetException, IllegalAccessException {
-        printTableHeader();
-        for (Method method : uuidLongGenerator.getClass().getDeclaredMethods()) {
-            collisionAndNegativeCheck(method);
-        }
-    }
-
-    private void printTableHeader() {
-        logger.info(String.format("%-30s %-15s %-15s %-15s %-15s%n", "Approach", "collisions", "negatives", "collision", "negative"));
-        logger.info(String.format("%-30s %-15s %-15s %-15s %-15s%n", "(method name)", "count", "count", "probability", "probability"));
-        System.out.println("--------------------------------------------------------------------------------------------");
-    }
-
-    private void printOutput(String method, int collisionsCount, int negativeCount, double collisionsProbability, double negativeProbability) {
-        DecimalFormat decimalFormat = new DecimalFormat("#.#####");
-        logger.info(String.format("%-30s %-15s %-15s %-15s %-15s", method, collisionsCount, negativeCount, decimalFormat.format(collisionsProbability), decimalFormat.format(negativeProbability)));
-    }
-
-    private void collisionAndNegativeCheck(Method method) throws InvocationTargetException, IllegalAccessException {
-        Set<Long> uniqueValues = new HashSet<>();
-        int collisions = 0;
-        int negative = 0;
-
-        for (int i = 0; i < n; i++) {
-            long uniqueValue = (long) method.invoke(uuidLongGenerator);
-            if (!uniqueValues.add(uniqueValue)) {
-                collisions++;
-            }
-            if (uniqueValue < 0) {
-                negative++;
-            }
-        }
-
-        double collisionsProbability = (double) collisions / n;
-        double negativeProbability = (double) negative / n;
-        printOutput(method.getName(), collisions, negative, collisionsProbability, negativeProbability);
-
-        assertThat(collisionsProbability).isLessThan(COLLISION_THRESHOLD);
-    }
-}
diff --git a/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/UUIDPositiveLongGeneratorUnitTest.java b/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/UUIDPositiveLongGeneratorUnitTest.java
index 2df49b20fd..c910a6eb16 100644
--- a/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/UUIDPositiveLongGeneratorUnitTest.java
+++ b/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/UUIDPositiveLongGeneratorUnitTest.java
@@ -14,6 +14,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 
 public class UUIDPositiveLongGeneratorUnitTest {
     private final static int n = 1000000;
+    private final static double COLLISION_THRESHOLD = 0.001;
     private final UUIDPositiveLongGenerator uuidLongGenerator = new UUIDPositiveLongGenerator();
     private final Logger logger = LoggerFactory.getLogger(UUIDPositiveLongGeneratorUnitTest.class);
 
@@ -34,8 +35,7 @@ public class UUIDPositiveLongGeneratorUnitTest {
 
     private void printOutput(String method, int collisionsCount, int negativeCount, double collisionsProbability, double negativeProbability) {
         DecimalFormat decimalFormat = new DecimalFormat("#.#####");
-        //logger.info(String.format("%-30s %-15s %-15s %-15s %-15s", method, collisionsCount, negativeCount, decimalFormat.format(collisionsProbability), decimalFormat.format(negativeProbability)));
-        logger.info("%-30s{} %-15s{} %-15s{} %-15s{} %-15s{}", method, collisionsCount, negativeCount, decimalFormat.format(collisionsProbability), decimalFormat.format(negativeProbability));
+        logger.info(String.format("%-30s %-15s %-15s %-15s %-15s", method, collisionsCount, negativeCount, decimalFormat.format(collisionsProbability), decimalFormat.format(negativeProbability)));
     }
 
 
@@ -55,6 +55,6 @@ public class UUIDPositiveLongGeneratorUnitTest {
         double collisionsProbability = (double) collisions / n;
         double negativeProbability = (double) negative / n;
         printOutput(method.getName(), collisions, negative, collisionsProbability, negativeProbability);
-        assertThat(collisionsProbability).isLessThan(0.001);
+        assertThat(collisionsProbability).isLessThan(COLLISION_THRESHOLD);
     }
 }