strongduanmu opened a new issue #10923:
URL: https://github.com/apache/shardingsphere/issues/10923


   Hi community,
   
   This issue is for #10887.
   
   # Background
   
   Currently `FederateStatementTest` and `FederatePrepareStatementTest` use 
JUNIT to test SQL statements. In order to improve test coverage and code 
elegance, we need to migrate the test scenarios of FederateStatementTest and 
FederatePrepareStatementTest to `shardingsphere-integration-test`. 
   
   # Target
   
   The goal of this issue is to migrate the 
`SELECT_SQL_BY_ID_ACROSS_SINGLE_AND_SHARDING_TABLES` statement to the 
`shardingsphere-integration-test` module. 
   
   You can search for the `SELECT_SQL_BY_ID_ACROSS_SINGLE_AND_SHARDING_TABLES` 
keyword, and then you will find the test cases in `FederateStatementTest` and 
`FederatePrepareStatementTest`.
   
   FederateStatementTest:
   
   ```java
       private static final String 
SELECT_PARTIAL_DISTINCT_AGGREGATION_SQL_FOR_SHARDING_TABLE =
               "SELECT SUM(DISTINCT user_id), SUM(order_id_sharding) FROM 
t_order_federate_sharding WHERE order_id_sharding > 1000";
   
       @Test
       public void 
assertPartialDistinctAggregationForShardingTableWithFederateByExecuteQuery() 
throws SQLException {
           assertPartialDistinctAggregationForShardingTableWithFederate(true);
       }
       
       @Test
       public void 
assertPartialDistinctAggregationForShardingTableWithFederateByExecute() throws 
SQLException {
           assertPartialDistinctAggregationForShardingTableWithFederate(false);
       }
       
       private void 
assertPartialDistinctAggregationForShardingTableWithFederate(final boolean 
executeQuery) throws SQLException {
           Statement statement = 
getShardingSphereDataSource().getConnection().createStatement();
           ResultSet resultSet = getResultSet(statement, 
SELECT_PARTIAL_DISTINCT_AGGREGATION_SQL_FOR_SHARDING_TABLE, executeQuery);
           assertNotNull(resultSet);
           assertTrue(resultSet.next());
           assertThat(resultSet.getInt(1), is(21));
           assertThat(resultSet.getInt(2), is(4222));
           assertNotNull(resultSet);
       }
   ```
   
   FederatePrepareStatementTest:
   
   ```java
       private static final String 
SELECT_PARTIAL_DISTINCT_AGGREGATION_SQL_FOR_SHARDING_TABLE =
               "SELECT SUM(DISTINCT user_id), SUM(order_id_sharding) FROM 
t_order_federate_sharding WHERE order_id_sharding > ?";
   
       @Test
       public void 
assertPartialDistinctAggregationForShardingTableWithFederateByExecuteQuery() 
throws SQLException {
           assertPartialDistinctAggregationForShardingTableWithFederate(true);
       }
       
       @Test
       public void 
assertPartialDistinctAggregationForShardingTableWithFederateByExecute() throws 
SQLException {
           assertPartialDistinctAggregationForShardingTableWithFederate(false);
       }
       
       private void 
assertPartialDistinctAggregationForShardingTableWithFederate(final boolean 
executeQuery) throws SQLException {
           PreparedStatement preparedStatement = 
getShardingSphereDataSource().getConnection().prepareStatement(SELECT_PARTIAL_DISTINCT_AGGREGATION_SQL_FOR_SHARDING_TABLE);
           preparedStatement.setInt(1, 1000);
           ResultSet resultSet = getResultSet(preparedStatement, executeQuery);
           assertNotNull(resultSet);
           assertTrue(resultSet.next());
           assertThat(resultSet.getInt(1), is(21));
           assertThat(resultSet.getInt(2), is(4222));
           assertNotNull(resultSet);
       }
   ```
   
   # How to
   In order to finish this task, you need to understand the 
[documentation](https://shardingsphere.apache.org/document/current/en/features/test-engine/integration-test/)
 of the integration test first, and PR #10913 also provides an example, which 
you can refer to. BTW, if you have any questions, please leave a comment.


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