[BugFix] mock LocalClusterState settings in QueryPlanner base class (o…

…pendistro-for-elasticsearch#446)

src/test/java/com/amazon/opendistroforelasticsearch/sql/unittest/planner/QueryPlannerTest.java

@@ -21,9 +21,11 @@
 import com.alibaba.druid.sql.parser.SQLExprParser;
 import com.alibaba.druid.sql.parser.Token;
 import com.amazon.opendistroforelasticsearch.sql.domain.JoinSelect;
+import com.amazon.opendistroforelasticsearch.sql.esdomain.LocalClusterState;
 import com.amazon.opendistroforelasticsearch.sql.exception.SqlParseException;
 import com.amazon.opendistroforelasticsearch.sql.parser.ElasticSqlExprParser;
 import com.amazon.opendistroforelasticsearch.sql.parser.SqlParser;
+import com.amazon.opendistroforelasticsearch.sql.plugin.SqlSettings;
 import com.amazon.opendistroforelasticsearch.sql.query.QueryAction;
 import com.amazon.opendistroforelasticsearch.sql.query.SqlElasticRequestBuilder;
 import com.amazon.opendistroforelasticsearch.sql.query.join.ESJoinQueryActionFactory;
@@ -61,11 +63,13 @@
 import java.util.Arrays;
 import java.util.List;
 
+import static java.util.Collections.emptyList;
 import static org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilderFactory.newConfigurationBuilder;
 import static org.mockito.Matchers.any;
 import static org.mockito.Mockito.doAnswer;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.when;
 
 /**
@@ -110,6 +114,12 @@ public static void initLogger() {
     public void init() {
         MockitoAnnotations.initMocks(this);
 
+        SqlSettings settings = spy(new SqlSettings());
+        // Force return empty list to avoid ClusterSettings be invoked which is a final class and hard to mock.
+        // In this case, default value in Setting will be returned all the time.
+        doReturn(emptyList()).when(settings).getSettings();
+        LocalClusterState.state().setSqlSettings(settings);
+
         ActionFuture mockFuture = mock(ActionFuture.class);
         when(client.execute(any(), any())).thenReturn(mockFuture);