issue #40 : checkRules must take into account rules order

easyrules-core/src/main/java/org/easyrules/core/DefaultRulesEngine.java

@@ -122,6 +122,7 @@ class DefaultRulesEngine implements RulesEngine {
     @Override
     public Map<Rule, Boolean> checkRules() {
         LOGGER.info("Checking rules");
+        sortRules();
         Map<Rule, Boolean> result = new HashMap<>();
         for (Rule rule : rules) {
             result.put(rule, rule.evaluate());

easyrules-core/src/test/java/org/easyrules/core/DefaultRulesEngineTest.java

@@ -10,8 +10,7 @@ import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.mockito.InOrder;
-import org.mockito.Mock;
+import org.mockito.*;
 import org.mockito.runners.MockitoJUnitRunner;
 
 import java.util.Map;
@@ -85,6 +84,22 @@ public class DefaultRulesEngineTest {
         inOrder.verify(anotherRule).execute();
     }
 
+    @Test
+    public void rulesMustBeCheckedInTheirNaturalOrder() throws Exception {
+        when(rule.evaluate()).thenReturn(true);
+        when(anotherRule.evaluate()).thenReturn(true);
+        when(rule.compareTo(anotherRule)).thenReturn(-1);
+        when(anotherRule.compareTo(rule)).thenReturn(1);
+        rulesEngine.registerRule(rule);
+        rulesEngine.registerRule(anotherRule);
+
+        rulesEngine.checkRules();
+
+        InOrder inOrder = inOrder(rule, anotherRule);
+        inOrder.verify(rule).evaluate();
+        inOrder.verify(anotherRule).evaluate();
+    }
+
     @Test
     public void actionsMustBeExecutedInTheDefinedOrder() {
         rulesEngine.registerRule(annotatedRule);