Change RulesEngine#getParameters to return a copy of the parameters

Resolves #158

easy-rules-core/src/main/java/org/jeasy/rules/core/AbstractRuleEngine.java

@@ -56,7 +56,12 @@ abstract class AbstractRuleEngine implements RulesEngine {
 
     @Override
     public RulesEngineParameters getParameters() {
-        return parameters;
+        return new RulesEngineParameters(
+                parameters.isSkipOnFirstAppliedRule(),
+                parameters.isSkipOnFirstFailedRule(),
+                parameters.isSkipOnFirstNonTriggeredRule(),
+                parameters.getPriorityThreshold()
+        );
     }
 
     @Override

easy-rules-core/src/test/java/org/jeasy/rules/core/DefaultRulesEngineTest.java

@@ -217,6 +217,24 @@ public class DefaultRulesEngineTest extends AbstractTest {
         // Should not throw exception
     }
 
+    @Test
+    public void getParametersShouldReturnACopyOfTheParameters() {
+        // Given
+        RulesEngineParameters parameters = new RulesEngineParameters()
+                .skipOnFirstAppliedRule(true)
+                .skipOnFirstFailedRule(true)
+                .skipOnFirstNonTriggeredRule(true)
+                .priorityThreshold(42);
+        DefaultRulesEngine rulesEngine = new DefaultRulesEngine(parameters);
+
+        // When
+        RulesEngineParameters engineParameters = rulesEngine.getParameters();
+
+        // Then
+        Assertions.assertThat(engineParameters).isNotSameAs(parameters);
+        Assertions.assertThat(engineParameters).isEqualToComparingFieldByField(parameters);
+    }
+
     @Test
     public void testGetRuleListeners() throws Exception {
         // Given