AMBARI-6622. BlueprintResourceProviderTest fails on exception message assertion

ambari-server/src/main/java/org/apache/ambari/server/controller/internal/BlueprintResourceProvider.java

@@ -84,6 +84,8 @@ public class BlueprintResourceProvider extends BaseBlueprintProcessor {
   protected static final String CONFIGURATION_PROPERTY_ID = "configurations";
   protected static final String PROPERTIES_PROPERTY_ID = "properties";
   protected static final String PROPERTIES_ATTRIBUTES_PROPERTY_ID = "properties_attributes";
+  protected static final String SCHEMA_IS_NOT_SUPPORTED_MESSAGE =
+      "Configuration format provided in Blueprint is not supported";
 
   // Primary Key Fields
   private static Set<String> pkPropertyIds =
@@ -528,7 +530,7 @@ public class BlueprintResourceProvider extends BaseBlueprintProcessor {
           || (levels == 4 && PROPERTIES_ATTRIBUTES_PROPERTY_ID.equals(propertiesType))) {
         return new BlueprintConfigPopulationStrategyV2();
       } else {
-        throw new IllegalArgumentException("Configuration format provided in Blueprint is not supported");
+        throw new IllegalArgumentException(SCHEMA_IS_NOT_SUPPORTED_MESSAGE);
       }
     } else {
       return new BlueprintConfigPopulationStrategyV2();

ambari-server/src/test/java/org/apache/ambari/server/controller/internal/BlueprintResourceProviderTest.java

@@ -1468,7 +1468,7 @@ public class BlueprintResourceProviderTest {
     Map<String, String> configMap = new HashMap<String, String>();
     configMap.put("global/properties/lot/nagios_contact", "foo@ffl.dsfds");
     expectedException.expect(IllegalArgumentException.class);
-    expectedException.expectMessage("Configuration definition schema is not supported");
+    expectedException.expectMessage(provider.SCHEMA_IS_NOT_SUPPORTED_MESSAGE);
 
     provider.decidePopulationStrategy(configMap);
   }