fix: force usage of safe absolute value when generating v1 (#11)

Author: carldenigma

src/main/java/io/github/thibaultmeyer/cuid/CUID.java

@@ -225,7 +225,7 @@ private static synchronized int nextCounterValue() {
          */
         private static String getRandomBlock() {
 
-            return Common.padWithZero(Integer.toString(Common.nextIntValue() * DISCRETE_VALUE, NUMBER_BASE), BLOCK_SIZE);
+            return Common.padWithZero(Integer.toString(safeAbs(Common.nextIntValue() * DISCRETE_VALUE), NUMBER_BASE), BLOCK_SIZE);
         }
     }
 

src/test/java/io/github/thibaultmeyer/cuid/CUIDv1Test.java

@@ -132,4 +132,13 @@ void unicityOver500000() {
         // Assert
         Assertions.assertEquals(500000, cuidSet.size());
     }
+
+    @Test
+    void validCreation500000() {
+        // Act & Assert
+        for (int i = 0; i < 500000; i += 1) {
+            final CUID cuid = CUID.randomCUID1();
+            Assertions.assertTrue(CUID.isValid(cuid.toString()));
+        }
+    }
 }