Ensure the randomize function always returns a number greater than 1.0 (

resilience4j#2152)

* Ensure the randomize function always returns a number greater than 1.0

* Update randomizationFactor validation to allow 1.0

* Add that 1.0f also passes in the shouldPassPositiveRandomizationFactor test

resilience4j-core/src/main/java/io/github/resilience4j/core/IntervalFunction.java

@@ -239,8 +239,9 @@ static double randomize(final double current, final double randomizationFactor)
         final double delta = randomizationFactor * current;
         final double min = current - delta;
         final double max = current + delta;
+        final double randomizedValue = min + (Math.random() * (max - min + 1));
 
-        return (min + (Math.random() * (max - min + 1)));
+        return Math.max(1.0, randomizedValue);
     }
 
     static void checkInterval(long intervalMillis) {
@@ -251,7 +252,7 @@ static void checkInterval(long intervalMillis) {
     }
 
     static void checkRandomizationFactor(double randomizationFactor) {
-        if (randomizationFactor < 0.0 || randomizationFactor >= 1.0) {
+        if (randomizationFactor < 0.0 || randomizationFactor > 1.0) {
             throw new IllegalArgumentException(
                 "Illegal argument randomizationFactor: " + randomizationFactor);
         }

resilience4j-core/src/test/java/io/github/resilience4j/core/IntervalFunctionTest.java

@@ -118,7 +118,7 @@ public void shouldRejectOutOfBoundsRandomizationFactor() {
     public void shouldPassPositiveRandomizationFactor() {
         final Duration duration = Duration.ofMillis(100);
         final float multiplier = 1.5f;
-        final List<Float> correctFactors = List.of(0.0f, 0.25f, 0.5f, 0.75f, 0.1f);
+        final List<Float> correctFactors = List.of(0.0f, 0.1f, 0.25f, 0.5f, 0.75f, 1.0f);
 
         correctFactors.forEach(v -> IntervalFunction.ofRandomized(duration, v));
         correctFactors